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Frequency domain analysis.", "journal": "Cardiology Clinics", "year": 1992, "industry_ties": { "checked": false } }, { "role": "supporting", "id": "doi:10.1159/000169270", "url": "https://doi.org/10.1159/000169270", "title": "Heart-rate variability in sleep and wakefulness.", "journal": "Cardiology", "year": 1971, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/measurement-validity", "desk": "hrv", "desk_name": "HRV", "statement": "Consumer wearables measure HRV accurately enough to be meaningful for everyday users.", "question": "Do consumer wearables measure HRV accurately compared to an ECG reference?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#measurement-validity", "registry_finding": { "id": "KYP-ER-0003", "url": "https://knowyourprime.com/evidence-wearable-hrv-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.14814/phy2.70527", "url": "https://doi.org/10.14814/phy2.70527", "title": "Validation of nocturnal resting heart rate and heart rate variability in consumer wearables.", "journal": "Physiological Reports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s25185745", "url": "https://doi.org/10.3390/s25185745", "title": "A Comparative Study Between ECG- and PPG-Based Heart Rate Sensors for Heart Rate Variability Measurements: Influence of Body Position, Duration, Sex, and Age.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1123/ijspp.2025-0126", "url": "https://doi.org/10.1123/ijspp.2025-0126", "title": "Limited Validity of the Low-Cost Coospo H808S Heart-Rate Monitor Compared to the Polar H10.", "journal": "International Journal of Sports Physiology and Performance", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s24196220", "url": "https://doi.org/10.3390/s24196220", "title": "The Validity of Apple Watch Series 9 and Ultra 2 for Serial Measurements of Heart Rate Variability and Resting Heart Rate.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s24237475", "url": "https://doi.org/10.3390/s24237475", "title": "Deriving Accurate Nocturnal Heart Rate, rMSSD and Frequency HRV from the Oura Ring.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/psyp.14604", "url": "https://doi.org/10.1111/psyp.14604", "title": "Publication guidelines for human heart rate and heart rate variability studies in psychophysiology-Part 1: Physiological underpinnings and foundations of measurement.", "journal": "Psychophysiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2478/folmed-2018-0012", "url": "https://doi.org/10.2478/folmed-2018-0012", "title": "Can Wearable Devices Accurately Measure Heart Rate Variability? A Systematic Review.", "journal": "Folia Medica", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1186/s12872-026-06556-4", "url": "https://doi.org/10.1186/s12872-026-06556-4", "title": "Reliability and inter-device agreement of multi-site heart rate variability measurements during transcutaneous auricular vagus nerve stimulation: a prospective single-arm methodological physiological study.", "journal": "BMC Cardiovascular Disorders", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.3390/s25247556", "url": "https://doi.org/10.3390/s25247556", "title": "Signal Quality Assessment and Reconstruction of PPG-Derived Signals for Heart Rate and Variability Estimation in In-Vehicle Applications: A Comparative Review and Empirical Validation.", "journal": "Sensors", "year": 2025, 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IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.hrthm.2016.02.006", "url": "https://doi.org/10.1016/j.hrthm.2016.02.006", "title": "Reference values for time- and frequency-domain heart rate variability measures.", "journal": "Heart Rhythm", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10286-017-0445-3", "url": "https://doi.org/10.1007/s10286-017-0445-3", "title": "Reproducibility of 24-h heart rate variability in children.", "journal": "Clinical Autonomic Research", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.cmpb.2013.07.024", "url": "https://doi.org/10.1016/j.cmpb.2013.07.024", "title": "Kubios HRV--heart rate variability analysis software.", "journal": "Computer Methods and Programs in Biomedicine", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/02640414.2012.721931", "url": "https://doi.org/10.1080/02640414.2012.721931", "title": "Intra-day and inter-day reliability of heart rate variability measurement.", "journal": "Journal of Sports Sciences", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/j.1540-8159.2010.02841.x", "url": "https://doi.org/10.1111/j.1540-8159.2010.02841.x", "title": "A quantitative systematic review of normal values for short-term heart rate variability in healthy adults.", "journal": "Pacing and Clinical Electrophysiology", "year": 2011, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1249/mss.0b013e318184a4b1", "url": "https://doi.org/10.1249/MSS.0b013e318184a4b1", "title": "Validity and reliability of short-term heart-rate variability from the Polar S810.", "journal": "Medicine and Science in Sports and Exercise", "year": 2009, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/trait-neuroticism", "desk": "hrv", "desk_name": "HRV", "statement": "Higher trait neuroticism is associated with lower heart rate variability.", "question": "Is trait neuroticism associated with lower heart rate variability?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this 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"supporting", "id": "doi:10.1016/j.biopsycho.2016.03.002", "url": "https://doi.org/10.1016/j.biopsycho.2016.03.002", "title": "Neuroticism and extraversion in relation to physiological stress reactivity during adolescence.", "journal": "Biological Psychology", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "pmid:23788220", "url": "https://pubmed.ncbi.nlm.nih.gov/23788220/", "title": "Relationship between neuroticism, threat of shock and heart rate variability reactivity.", "journal": "International Maritime Health", "year": 2014, "industry_ties": { "checked": false } }, { "role": "supporting", "id": "doi:10.1017/s0033291711002479", "url": "https://doi.org/10.1017/S0033291711002479", "title": "Decreased heart rate variability during emotion regulation in subjects at risk for psychopathology.", "journal": "Psychological Medicine", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1037/a0018698", "url": "https://doi.org/10.1037/a0018698", "title": "Neuroticism's importance in understanding the daily life correlates of heart rate variability.", "journal": "Emotion", "year": 2010, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/normal-range-age", "desk": "hrv", "desk_name": "HRV", "statement": "Resting heart rate variability declines steadily with age, so what counts as a normal value depends on age.", "question": "Is there a normal HRV range, and does it change with age?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "Some evidence conflicts on secondary points that do 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HRV is lower in generalized anxiety and panic disorder, but not in social anxiety or obsessive-compulsive disorder, so the association is not uniform across anxiety conditions.", "question": "Is lower HRV associated with anxiety?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#anxiety", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1037/abn0000936", "url": "https://doi.org/10.1037/abn0000936", "title": "A meta-analysis of heart rate variability and psychopathology: An 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A Case-Control Study on Vagally Mediated Heart Rate Variability Responses in Anxious and Non-Anxious Individuals During a Cognitive Task.", "journal": "Medical Sciences", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1038/s41398-025-03339-x", "url": "https://doi.org/10.1038/s41398-025-03339-x", "title": "Heart rate variability in mental disorders: an umbrella review of meta-analyses.", "journal": "Translational Psychiatry", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/hypertensionaha.125.26014", "url": "https://doi.org/10.1161/HYPERTENSIONAHA.125.26014", "title": "Heart Rate Variability Moderates the Association Between Trait Anxiety and Sympathetic Nerve Activity in Humans.", "journal": "Hypertension (Dallas, Tex", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ijpsycho.2025.113286", "url": "https://doi.org/10.1016/j.ijpsycho.2025.113286", "title": "The role of perseverative cognition and heart rate variability in high trait anxiety.", "journal": "International Journal of Psychophysiology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/antidepressants", "desk": "hrv", "desk_name": "HRV", "statement": "A controlled trial of venlafaxine and mirtazapine found HRV fell further during treatment, while a larger comparison across antidepressant classes found no significant drug effect.", "question": "Do antidepressants change HRV?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#antidepressants", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1097/wnf.0b013e3182a76fbb", "url": "https://doi.org/10.1097/WNF.0b013e3182a76fbb", "title": "Heart rate variability during antidepressant treatment with venlafaxine and mirtazapine.", "journal": "Clinical Neuropharmacology", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1055/s-0042-102964", "url": "https://doi.org/10.1055/s-0042-102964", "title": "The Effects of Antidepressants and Quetiapine on Heart Rate Variability.", "journal": "Pharmacopsychiatry", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/reactive-aggression", "desk": "hrv", "desk_name": "HRV", "statement": "HRV does not predict reactive aggression. A meta-analysis of 48 effect estimates found no correlation, against a theory that predicted one.", "question": "Does low HRV predict reactive aggression?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#reactive-aggression", "registry_finding": null, "studies": [ { "role": "null_result", "id": "doi:10.1002/ab.70004", "url": "https://doi.org/10.1002/ab.70004", "title": "Theories of Arousal Predict a Link Between Heart Rate Variability and Reactive Aggression: Meta-Analytic Results Disagree.", "journal": "Aggressive Behavior", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/cannabis", "desk": "hrv", "desk_name": "HRV", "statement": "Oral THC lowers heart rate variability and raises heart rate, and the size of the drop tracks the dose.", "question": "Does cannabis affect HRV?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#cannabis", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1111/psyp.13955", "url": "https://doi.org/10.1111/psyp.13955", "title": "Acute effects of oral delta-9-tetrahydrocannabinol (THC) on autonomic cardiac activity and their relation to subjective and anxiogenic effects.", "journal": "Psychophysiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/air-quality", "desk": "hrv", "desk_name": "HRV", "statement": "Cutting indoor fine-particulate exposure raised HRV within a single working day in a randomized crossover trial.", "question": "Does air pollution exposure lower HRV?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#air-quality", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.envres.2024.120245", "url": "https://doi.org/10.1016/j.envres.2024.120245", "title": "Heart rate variability, electrodermal activity and cognition in adults: Association with short-term indoor PM2.5 exposure in a real-world intervention study.", "journal": "Environmental Research", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/menstrual-cycle", "desk": "hrv", "desk_name": "HRV", "statement": "A large wearable study found HRV falls before menses and rises after, while a densely sampled study aligned to ovulation found no consistent population-level rhythm at all.", "question": "Does HRV vary across the menstrual cycle?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Null-result evidence bears directly on the claimed effect.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#menstrual-cycle", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1007/s00737-026-01740-z", "url": "https://doi.org/10.1007/s00737-026-01740-z", "title": "Wearable-measured heart rate variability and premenstrual disorder symptoms across menstrual cycle.", "journal": "Archives of Women's Mental Health", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1249/mss.0000000000003966", "url": "https://doi.org/10.1249/MSS.0000000000003966", "title": "Variations in Estrogen, Progesterone, and Nocturnal Physiology are not Associated with Performance and Sleep within and between Menstrual Cycles.", "journal": "Medicine and Science in Sports and Exercise", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1152/ajpregu.00028.2026", "url": "https://doi.org/10.1152/ajpregu.00028.2026", "title": "Cardiac autonomic regulation across the menstrual cycle is highly individual: evidence from phase-aligned cyclic generalized additive mixed models.", "journal": "American Journal of Physiology. 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In one randomized trial atenolol raised it.", "question": "Do beta blockers lower HRV?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "At least one unresolved conflicting study bears on the core claim, capping the rating until reconciled.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#beta-blockers", "registry_finding": null, "studies": [ { "role": "conflicting", "id": "doi:10.1016/j.psychres.2026.117341", "url": "https://doi.org/10.1016/j.psychres.2026.117341", "title": "Effect of atenolol versus ivabradine on heart rate variability in patients of schizophrenia with clozapine-induced tachycardia: a randomized controlled trial.", "journal": "Psychiatry Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1186/s12872-025-05164-y", "url": "https://doi.org/10.1186/s12872-025-05164-y", "title": "Effects of low-dose metoprolol succinate sustained-release tablets on patients with paroxysmal atrial fibrillation undergoing circumferential pulmonary vein isolation: a retrospective cohort study.", "journal": "BMC Cardiovascular Disorders", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1186/s13104-018-3224-x", "url": "https://doi.org/10.1186/s13104-018-3224-x", "title": "Effect of propranolol on heart rate variability in hyperthyroidism.", "journal": "BMC Research Notes", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/chest-strap-accuracy", "desk": "hrv", "desk_name": "HRV", "statement": "A chest strap matches a clinical ECG for HRV at rest, closely enough to be interchangeable with it. Agreement falls away as exercise intensity rises.", "question": "Is a chest strap as accurate as an ECG for HRV?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#chest-strap-accuracy", "registry_finding": { "id": "KYP-ER-0004", "url": "https://knowyourprime.com/evidence-chest-strap-hrv-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.autneu.2026.103447", "url": "https://doi.org/10.1016/j.autneu.2026.103447", "title": "Validity of the Polar H10 for heart rate variability and cardiac autonomic reflex tests.", "journal": "Autonomic Neuroscience", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s21030902", "url": "https://doi.org/10.3390/s21030902", "title": "Validity of the Polar H7 Heart Rate Sensor for Heart Rate Variability Analysis during Exercise in Different Age, Body Composition and Fitness Level Groups.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1123/ijspp.2025-0126", "url": "https://doi.org/10.1123/ijspp.2025-0126", "title": "Limited Validity of the Low-Cost Coospo H808S Heart-Rate Monitor Compared to the Polar H10.", "journal": "International Journal of Sports Physiology and Performance", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1123/ijspp.2019-0406", "url": "https://doi.org/10.1123/ijspp.2019-0406", "title": "Validity of a Smartphone Application and Chest Strap for Recording RR Intervals at Rest in Athletes.", "journal": "International Journal of Sports Physiology and Performance", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2478/folmed-2018-0012", "url": "https://doi.org/10.2478/folmed-2018-0012", "title": "Can Wearable Devices Accurately Measure Heart Rate Variability? A Systematic Review.", "journal": "Folia Medica", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "hrv/measurement-duration", "desk": "hrv", "desk_name": "HRV", "statement": "RMSSD stays reliable in recordings as short as one minute. The other HRV indices need longer.", "question": "Is a short HRV reading reliable?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-24", "url": "https://knowyourprime.com/research-desk-hrv#measurement-duration", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1111/anec.12565", "url": "https://doi.org/10.1111/anec.12565", "title": "Ultra-short heart rate variability recording reliability: The effect of controlled paced breathing.", "journal": "Annals of Noninvasive Electrocardiology", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.3390/s20205738", "url": "https://doi.org/10.3390/s20205738", "title": "Validity of Smartphone Heart Rate Variability Pre- and Post-Resistance Exercise.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/erv.70104", "url": "https://doi.org/10.1002/erv.70104", "title": "Heart Rate Variability in Anorexia Nervosa: A Systematic Review and Meta-Analysis on the Moderating Role of Measurement Duration and Clinical Stage.", "journal": "European Eating Disorders Review", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.33963/kp.a2021.0054", "url": "https://doi.org/10.33963/KP.a2021.0054", "title": "Short-term heart rate variability in resting conditions: 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"https://doi.org/10.1007/s00392-023-02248-7", "title": "Heart rate variability: reference values and role for clinical profile and mortality in individuals with heart failure.", "journal": "Clinical Research in Cardiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.18632/aging.101386", "url": "https://doi.org/10.18632/aging.101386", "title": "Heart rate variability as predictive factor for sudden cardiac death.", "journal": "Aging", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/jaha.120.016075", "url": "https://doi.org/10.1161/JAHA.120.016075", "title": "Heart Rate Variability Triangular Index as a Predictor of Cardiovascular Mortality in Patients With Atrial Fibrillation.", "journal": "Journal of the American Heart Association", "year": 2021, "industry_ties": { 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Heart and Circulatory Physiology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [ "Whoop" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-024-74619-7", "url": "https://doi.org/10.1038/s41598-024-74619-7", "title": "Assessment of heart rate measurements by commercial wearable fitness trackers for early identification of metabolic syndrome risk.", "journal": "Scientific Reports", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4093/dmj.2023.0305", "url": "https://doi.org/10.4093/dmj.2023.0305", "title": "Temporal Changes in Resting Heart Rate and Risk of Diabetes Mellitus.", "journal": "Diabetes & Metabolism Journal", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.tcm.2022.05.006", "url": "https://doi.org/10.1016/j.tcm.2022.05.006", "title": "Importance of resting heart rate.", "journal": "Trends in Cardiovascular Medicine", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/jaha.120.018483", "url": "https://doi.org/10.1161/JAHA.120.018483", "title": "Resting Heartbeat Complexity Predicts All-Cause and Cardiorespiratory Mortality in Middle- to Older-Aged Adults From the UK Biobank.", "journal": "Journal of the American Heart Association", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/00325481.2020.1738142", "url": "https://doi.org/10.1080/00325481.2020.1738142", "title": "Heart rate as cardiovascular risk factor.", "journal": "Postgraduate Medicine", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/hjh.0000000000001857", "url": "https://doi.org/10.1097/HJH.0000000000001857", "title": "The link between elevated long-term resting heart rate and SBP variability for all-cause mortality.", "journal": "Journal of Hypertension", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/00365513.2019.1566567", "url": "https://doi.org/10.1080/00365513.2019.1566567", "title": "Resting heart rate and relation to disease and longevity: past, present and future.", "journal": "Scandinavian Journal of Clinical and Laboratory Investigation", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/dmrr.3095", "url": "https://doi.org/10.1002/dmrr.3095", "title": "Resting heart rate and risk of type 2 diabetes: A prospective cohort study and 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"doi:10.1111/eci.12892", "url": "https://doi.org/10.1111/eci.12892", "title": "Heart rate as a predictor of cardiovascular risk.", "journal": "European Journal of Clinical Investigation", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/srep40212", "url": "https://doi.org/10.1038/srep40212", "title": "Cumulative Resting Heart Rate Exposure and Risk of All-Cause Mortality: Results from the Kailuan Cohort Study.", "journal": "Scientific Reports", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jgs.14714", "url": "https://doi.org/10.1111/jgs.14714", "title": "Effect of Resting Heart Rate on All-Cause Mortality and Cardiovascular Events According to Age.", "journal": "Journal of the American Geriatrics Society", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s00392-015-0956-7", "url": "https://doi.org/10.1007/s00392-015-0956-7", "title": "Resting heart rate is an independent predictor of all-cause mortality in the middle aged general population.", "journal": "Clinical Research in Cardiology", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ejim.2015.02.009", "url": "https://doi.org/10.1016/j.ejim.2015.02.009", "title": "Heart rate and cardiovascular protection.", "journal": "European Journal of Internal Medicine", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1503/cmaj.150462", "url": "https://doi.org/10.1503/cmaj.150462", "title": "Resting heart rate, heart rate variability and functional decline in old age.", "journal": "CMAJ", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.amjmed.2014.09.016", "url": "https://doi.org/10.1016/j.amjmed.2014.09.016", "title": "Resting heart rate: risk indicator and emerging risk factor in cardiovascular disease.", "journal": "The American Journal of Medicine", "year": 2015, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0110985", "url": "https://doi.org/10.1371/journal.pone.0110985", "title": "Resting heart rate and risk of cardiovascular diseases and all-cause death: the Kailuan study.", "journal": "PloS One", "year": 2015, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/2047487313519932", "url": "https://doi.org/10.1177/2047487313519932", "title": "Elevations in time-varying resting heart rate predict subsequent all-cause mortality in older adults.", "journal": "European Journal of Preventive Cardiology", "year": 2015, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/eurheartj/ehs449", "url": "https://doi.org/10.1093/eurheartj/ehs449", "title": "Resting, night-time, and 24 h heart rate as markers of cardiovascular risk in middle-aged and elderly men and women with no apparent heart disease.", "journal": "European Heart Journal", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/heartjnl-2012-303375", "url": "https://doi.org/10.1136/heartjnl-2012-303375", "title": "Elevated resting heart rate, physical fitness and all-cause mortality: a 16-year follow-up in the Copenhagen Male Study.", "journal": "Heart", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4045/tidsskr.11.0629", "url": "https://doi.org/10.4045/tidsskr.11.0629", "title": "[Resting pulse rate as an indicator of health and disease].", "journal": "Tidsskrift for Den Norske Laegeforening", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1590/s0066-782x2010005000149", "url": "https://doi.org/10.1590/s0066-782x2010005000149", "title": "Predictive value of resting heart rate for cardiovascular and all-cause mortality.", "journal": "Arquivos Brasileiros De Cardiologia", "year": 2011, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacc.2007.04.079", "url": "https://doi.org/10.1016/j.jacc.2007.04.079", "title": "Resting heart rate in 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"doi:10.1093/oxfordjournals.eurheartj.a015465", "url": "https://doi.org/10.1093/oxfordjournals.eurheartj.a015465", "title": "The relationship between resting heart rate and all-cause, cardiovascular and cancer mortality.", "journal": "European Heart Journal", "year": 1998, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "rhr/measurement", "desk": "rhr", "desk_name": "Resting heart rate", "statement": "Consumer wearables measure resting heart rate accurately enough to be meaningful.", "question": "Do consumer wearables measure resting heart rate accurately against a clinical reference?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Multiple supporting studies are consistent with the core relationship.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is 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"doi:10.2196/67721", "url": "https://doi.org/10.2196/67721", "title": "Effects of Heat Adaptation Behaviors on Resting Heart Rate Response to Summer Temperatures in Older Adults: Wearable Device Panel Study.", "journal": "JMIR mHealth and uHealth", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-021-93924-z", "url": "https://doi.org/10.1038/s41598-021-93924-z", "title": "A longitudinal analysis of COVID-19 lockdown stringency on sleep and resting heart rate measures across 20 countries.", "journal": "Scientific Reports", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [ "Oura" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0227709", "url": "https://doi.org/10.1371/journal.pone.0227709", "title": "Inter- and intraindividual variability in daily resting heart rate and its associations with age, sex, 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not only cardiovascular death. Each 10 beats per minute goes with about 14 percent more total cancer mortality.", "question": "Does resting heart rate predict death from things other than heart disease?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-rhr#rhr_cancer", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.numecd.2017.04.004", "url": "https://doi.org/10.1016/j.numecd.2017.04.004", "title": "Resting heart rate and the risk of cardiovascular disease, total cancer, and all-cause mortality - A systematic review and dose-response meta-analysis of prospective studies.", "journal": "Nutrition, Metabolism, and Cardiovascular Diseases", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "rhr/rate_lowering_mechanism", "desk": "rhr", "desk_name": "Resting heart rate", "statement": "Beta blockers cut heart rate by the same 12 beats per minute in sinus rhythm and in atrial fibrillation, and cut deaths only in sinus rhythm. The rate drop is not what saves lives.", "question": "Is a lower heart rate what makes beta blockers work?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-rhr#rate_lowering_mechanism", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.jacc.2017.04.001", "url": "https://doi.org/10.1016/j.jacc.2017.04.001", "title": "Heart Rate and Rhythm and the Benefit of Beta-Blockers in Patients With Heart Failure.", "journal": "Journal of the American College of Cardiology", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "rhr/rhr_heart_failure", "desk": "rhr", "desk_name": "Resting heart rate", "statement": "Each 10 beats per minute of resting heart rate goes with about 18 to 19 percent more heart failure risk, on a straight line with no threshold below which it stops mattering.", "question": "Does a high resting heart rate predict heart failure?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-rhr#rhr_heart_failure", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1097/hjh.0000000000001627", "url": "https://doi.org/10.1097/HJH.0000000000001627", "title": "Resting heart rate and the risk of hypertension and heart failure: a dose-response meta-analysis of prospective studies.", "journal": "Journal of Hypertension", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.numecd.2017.04.004", "url": "https://doi.org/10.1016/j.numecd.2017.04.004", "title": "Resting heart rate and the risk of cardiovascular disease, total cancer, and all-cause mortality - A systematic review and dose-response meta-analysis of prospective studies.", "journal": "Nutrition, Metabolism, and Cardiovascular Diseases", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/duration_health", "desk": "sleep", "desk_name": "Sleep", "statement": "Adequate sleep duration and quality are associated with better cardiometabolic, cognitive, and overall health outcomes.", "question": "Does short or insufficient sleep duration associate with adverse health outcomes?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#duration_health", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1161/hcq.0000000000000139", "url": "https://doi.org/10.1161/HCQ.0000000000000139", "title": "Multidimensional Sleep Health: Definitions and Implications for Cardiometabolic Health: A Scientific Statement From the American Heart Association.", "journal": "Circulation. 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"id": "doi:10.1093/sleep/zsx165", "url": "https://doi.org/10.1093/sleep/zsx165", "title": "Linking Light Exposure and Subsequent Sleep: A Field Polysomnography Study in Humans.", "journal": "Sleep", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1126/science.aad2993", "url": "https://doi.org/10.1126/science.aad2993", "title": "Local modulation of human brain responses by circadian rhythmicity and sleep debt.", "journal": "Science", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.biopsycho.2012.10.010", "url": "https://doi.org/10.1016/j.biopsycho.2012.10.010", "title": "Why REM sleep? Clues beyond the laboratory in a more challenging world.", "journal": "Biological Psychology", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/sleep/32.3.311", "url": "https://doi.org/10.1093/sleep/32.3.311", "title": "Banking sleep: realization of benefits during subsequent sleep restriction and recovery.", "journal": "Sleep", "year": 2009, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/0031-9384(93)90095-w", "url": "https://doi.org/10.1016/0031-9384(93)90095-w", "title": "Aging and changes in phasic events during sleep.", "journal": "Physiology & Behavior", "year": 1994, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/0006-3223(92)90058-8", "url": "https://doi.org/10.1016/0006-3223(92)90058-8", "title": "Good sleep, bad sleep: a meta-analysis of polysomnographic measures in insomnia, depression, and narcolepsy.", "journal": "Biological Psychiatry", "year": 1993, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/wearable_accuracy", "desk": "sleep", "desk_name": "Sleep", "statement": "Consumer wearable sleep trackers measure sleep accurately enough to be meaningful for everyday users.", "question": "Do consumer wearables measure sleep accurately?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#wearable_accuracy", "registry_finding": { "id": "KYP-ER-0007", "url": "https://knowyourprime.com/evidence-wearable-sleep-tracking-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.chest.2025.10.039", "url": "https://doi.org/10.1016/j.chest.2025.10.039", "title": "Real-World Use of Consumer Sleep Devices: A Rapid Review.", "journal": "Chest", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.5664/jcsm.11460", "url": "https://doi.org/10.5664/jcsm.11460", "title": "Performance of consumer wrist-worn sleep tracking devices compared to polysomnography: a meta-analysis.", "journal": "Journal of Clinical Sleep Medicine", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/52192", "url": "https://doi.org/10.2196/52192", "title": "Accuracy of Fitbit Charge 4, Garmin Vivosmart 4, and WHOOP Versus Polysomnography: Systematic Review.", "journal": "JMIR mHealth and uHealth", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1007/s40279-024-02077-2", "url": "https://doi.org/10.1007/s40279-024-02077-2", "title": "Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.", "journal": "Sports Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.sleep.2024.01.020", "url": "https://doi.org/10.1016/j.sleep.2024.01.020", "title": "Validity and reliability of the Oura Ring Generation 3 (Gen3) with Oura sleep staging algorithm 2.0 (OSSA 2.0) when compared to multi-night ambulatory polysomnography: A validation study of 96 participants and 421,045 epochs.", "journal": "Sleep Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: three authors report financial support from Oura" ] } }, { "role": "anchor", "id": "doi:10.3390/s24206532", "url": "https://doi.org/10.3390/s24206532", "title": "Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Oura" ], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/50983", "url": "https://doi.org/10.2196/50983", "title": "Accuracy of 11 Wearable, Nearable, and Airable Consumer Sleep Trackers: Prospective Multicenter Validation Study.", "journal": "JMIR mHealth and uHealth", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "authors work for and hold stock in Asleep, maker of the SleepRoutine app it tested" ] } }, { "role": "anchor", "id": "doi:10.2196/10527", "url": "https://doi.org/10.2196/10527", "title": "Accuracy of Fitbit Devices: Systematic Review and Narrative Syntheses of Quantitative Data", "journal": "JMIR Mhealth and Uhealth", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1186/s13104-020-05355-0", "url": "https://doi.org/10.1186/s13104-020-05355-0", "title": "Direct application of an ECG-based sleep staging algorithm on reflective photoplethysmography data decreases performance.", "journal": "BMC Research Notes", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [ "Philips" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/77033", "url": "https://doi.org/10.2196/77033", "title": "Evaluation of a Contactless Sleep Monitoring Device for Sleep Stage Detection at Home in a Healthy Population: Prospective Study in Free-Living Conditions.", "journal": "JMIR Human Factors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [ "Withings" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26082371", "url": "https://doi.org/10.3390/s26082371", "title": "Evaluating the Feasibility of Low-Cost, Contactless Consumer Sleep-Tracking Devices as Measurement Tools for Preliminary Sleep Research.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-025-93774-z", "url": "https://doi.org/10.1038/s41598-025-93774-z", "title": "Performance of wearable finger ring trackers for diagnostic sleep measurement in the clinical context.", "journal": "Scientific Reports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.14814/phy2.70527", "url": "https://doi.org/10.14814/phy2.70527", "title": "Validation of nocturnal resting heart rate and heart rate variability in consumer wearables.", "journal": "Physiological Reports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jsr.14480", "url": "https://doi.org/10.1111/jsr.14480", "title": "Performance evaluation of an under-mattress sleep sensor versus polysomnography in > 400 nights with healthy and unhealthy sleep.", "journal": "Journal of Sleep Research", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: two authors had a Withings-supported research grant" ] } }, { "role": "supporting", "id": "doi:10.3390/s24247982", "url": "https://doi.org/10.3390/s24247982", "title": "Domain Adversarial Convolutional Neural Network Improves the Accuracy and Generalizability of Wearable Sleep Assessment Technology.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: five authors are ActiGraph employees" ] } }, { "role": "supporting", "id": "doi:10.3390/s25061771", "url": "https://doi.org/10.3390/s25061771", "title": "A Comprehensive Review of Home Sleep Monitoring Technologies: Smartphone Apps, Smartwatches, and Smart Mattresses.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0330774", "url": "https://doi.org/10.1371/journal.pone.0330774", "title": "Validity and clinical utility of a wrist-worn device against polysomnography.", "journal": "PloS One", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc58623.2025.11252902", "url": "https://doi.org/10.1109/EMBC58623.2025.11252902", "title": "Automated REM vs NREM sleep staging using single overnight heart rate and accelerometer data.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11325-025-03544-4", "url": "https://doi.org/10.1007/s11325-025-03544-4", "title": "Diagnostic value of wearable and contactless technologies for detecting obstructive sleep apnea: a systematic review and meta-analysis.", "journal": "Sleep & Breathing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.smrv.2024.101951", "url": "https://doi.org/10.1016/j.smrv.2024.101951", "title": "Sleep assessment using EEG-based wearables - A systematic review.", "journal": "Sleep Medicine Reviews", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jsr.14143", "url": "https://doi.org/10.1111/jsr.14143", "title": "A systematic review of the performance of actigraphy in measuring sleep stages.", "journal": "Journal of Sleep Research", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/07487304241288607", "url": "https://doi.org/10.1177/07487304241288607", "title": "The Combination of Topological Data Analysis and Mathematical Modeling Improves Sleep Stage Prediction From Consumer-Grade Wearables.", "journal": "Journal of Biological Rhythms", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s24175717", "url": "https://doi.org/10.3390/s24175717", "title": "Overnight Sleep Staging Using Chest-Worn Accelerometry.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: authors were employed by Philips" ] } }, { "role": "supporting", "id": "doi:10.3390/s22166317", "url": "https://doi.org/10.3390/s22166317", "title": "A Validation of Six Wearable Devices for Estimating Sleep, Heart Rate and Heart Rate Variability in Healthy Adults", "journal": "Sensors", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: the authors' lab receives funding and equipment from WHOOP" ] } }, { "role": "supporting", "id": "doi:10.3390/s21155071", "url": "https://doi.org/10.3390/s21155071", "title": "Deconstructing Commercial Wearable Technology: Contributions toward Accurate and Free-Living Monitoring of Sleep.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s21010076", "url": "https://doi.org/10.3390/s21010076", "title": "Validation of Zulu Watch against Polysomnography and Actigraphy for On-Wrist Sleep-Wake Determination and Sleep-Depth Estimation.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/16273", "url": "https://doi.org/10.2196/16273", "title": "Accuracy of Wristband Fitbit Models in Assessing Sleep: Systematic Review and Meta-Analysis.", "journal": "Journal of Medical Internet Research", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0238464", "url": "https://doi.org/10.1371/journal.pone.0238464", "title": "PSG Validation of minute-to-minute scoring for sleep and wake periods in a consumer wearable device.", "journal": "PloS One", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.5664/jcsm.6802", "url": "https://doi.org/10.5664/jcsm.6802", "title": "Improving Sleep Quality Assessment Using Wearable Sensors by Including Information From Postural/Sleep Position Changes and Body Acceleration: A Comparison of Chest-Worn Sensors, Wrist Actigraphy, and Polysomnography.", "journal": "Journal of Clinical Sleep Medicine", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.bpa.2005.08.006", "url": "https://doi.org/10.1016/j.bpa.2005.08.006", "title": "Processed EEG in natural sleep.", "journal": "Best Practice & Research. Clinical Anaesthesiology", "year": 2006, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/regularity_health", "desk": "sleep", "desk_name": "Sleep", "statement": "Regular and consistent sleep timing is associated with better health outcomes independent of duration.", "question": "Is irregular sleep timing independently associated with adverse health outcomes?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#regularity_health", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.smrv.2025.102203", "url": "https://doi.org/10.1016/j.smrv.2025.102203", "title": "Sleep regularity as an important component of sleep hygiene: a systematic review.", "journal": "Sleep Medicine Reviews", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.smrv.2022.101688", "url": "https://doi.org/10.1016/j.smrv.2022.101688", "title": "Associations between sleep variability and cardiometabolic health: A systematic review.", "journal": "Sleep Medicine Reviews", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1139/apnm-2020-0032", "url": "https://doi.org/10.1139/apnm-2020-0032", "title": "Sleep timing, sleep consistency, and health in adults: a systematic review.", "journal": "Applied Physiology, Nutrition, and Metabolism", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41467-026-72461-1", "url": "https://doi.org/10.1038/s41467-026-72461-1", "title": "Acute sleep rebound following sleep restriction is associated with reduced mortality risk.", "journal": "Nature Communications", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jjcc.2025.06.005", "url": "https://doi.org/10.1016/j.jjcc.2025.06.005", "title": "Association of weekend catch-up sleep, sleep durations and cardiometabolic multimorbidity: Based on NHANES.", "journal": "Journal of Cardiology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11325-025-03473-2", "url": "https://doi.org/10.1007/s11325-025-03473-2", "title": "Can weekend catch-up sleep repay the sleep debt? Balancing short-term relief with long-term risks.", "journal": "Sleep & Breathing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.smrv.2019.04.011", "url": "https://doi.org/10.1016/j.smrv.2019.04.011", "title": "Children's sleep and health: A meta-review.", "journal": "Sleep Medicine Reviews", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/stage_accuracy", "desk": "sleep", "desk_name": "Sleep", "statement": "Wearables are far better at telling sleep from wake than at naming which stage a sleeper is in. Reviews report real but partial staging ability, with REM the weakest.", "question": "Can a wearable tell which sleep stage you are in?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#stage_accuracy", "registry_finding": { "id": "KYP-ER-0016", "url": "https://knowyourprime.com/evidence-wearable-sleep-stage-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.2196/52192", "url": "https://doi.org/10.2196/52192", "title": "Accuracy of Fitbit Charge 4, Garmin Vivosmart 4, and WHOOP Versus Polysomnography: Systematic Review.", "journal": "JMIR mHealth and uHealth", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/jsr.14143", "url": "https://doi.org/10.1111/jsr.14143", "title": "A systematic review of the performance of actigraphy in measuring sleep stages.", "journal": "Journal of Sleep Research", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s22166317", "url": "https://doi.org/10.3390/s22166317", "title": "A Validation of Six Wearable Devices for Estimating Sleep, Heart Rate and Heart Rate Variability in Healthy Adults", "journal": "Sensors", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: the authors' lab receives funding and equipment from WHOOP" ] } }, { "role": "supporting", "id": "doi:10.1007/s40279-024-02077-2", "url": "https://doi.org/10.1007/s40279-024-02077-2", "title": "Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.", "journal": "Sports Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/debt_recovery", "desk": "sleep", "desk_name": "Sleep", "statement": "Recovery sleep after a stretch of short nights improves performance markedly without returning it to baseline. Two nights of weekend catch-up did not restore attention after six weeks of restriction.", "question": "Does catch-up sleep fully undo sleep debt?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#debt_recovery", "registry_finding": null, "studies": [ { "role": "null_result", "id": "doi:10.1093/sleep/zsab051", "url": "https://doi.org/10.1093/sleep/zsab051", "title": "Effects of six weeks of chronic sleep restriction with weekend recovery on cognitive performance and wellbeing in high-performing adults.", "journal": "Sleep", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1080/07420520802107106", "url": "https://doi.org/10.1080/07420520802107106", "title": "Recovery of cognitive performance from sleep debt: do a short rest pause and a single recovery night help?", "journal": "Chronobiology International", "year": 2008, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/sleep/26.2.117", "url": "https://doi.org/10.1093/sleep/26.2.117", "title": "The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation.", "journal": "Sleep", "year": 2003, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/caffeine_sleep", "desk": "sleep", "desk_name": "Sleep", "statement": "Caffeine cuts total sleep time by about 45 minutes and shifts sleep lighter. Avoiding that shortfall means about 8.8 hours between a coffee and bed.", "question": "Does caffeine before bed cut your sleep short?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#caffeine_sleep", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.smrv.2023.101764", "url": "https://doi.org/10.1016/j.smrv.2023.101764", "title": "The effect of caffeine on subsequent sleep: A systematic review and meta-analysis.", "journal": "Sleep Medicine Reviews", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/nu18081220", "url": "https://doi.org/10.3390/nu18081220", "title": "The Caffeinated Brain Part 2: The Effect of Caffeine on Sleep-Related Electroencephalography (EEG)-A Systematic and Mechanistic Review.", "journal": "Nutrients", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/acoustic_memory", "desk": "sleep", "desk_name": "Sleep", "statement": "Playing sounds timed to deep-sleep brain waves does reliably enhance those waves. Whether it improves memory the next morning did not reach significance when the trials were pooled.", "question": "Do deep-sleep sounds actually improve memory?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#acoustic_memory", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1093/sleep/zsaa296", "url": "https://doi.org/10.1093/sleep/zsaa296", "title": "Modulating overnight memory consolidation by acoustic stimulation during slow-wave sleep: a systematic review and meta-analysis.", "journal": "Sleep", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "pmid:30923474", "url": "https://pubmed.ncbi.nlm.nih.gov/30923474/", "title": "Can Slow-Wave Sleep Enhancement Improve Memory? 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Almost all of that evidence is cross-sectional, so whether losing deep sleep precedes the disease is not established.", "question": "Does poor deep sleep increase dementia risk?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#slow_wave_dementia", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.12809/eaap2577", "url": "https://doi.org/10.12809/eaap2577", "title": "Associations between slow-wave sleep and dementia: a systematic review.", "journal": "East Asian Archives of Psychiatry", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.sleep.2026.109211", "url": "https://doi.org/10.1016/j.sleep.2026.109211", "title": "Sleep microstructure and cognitive trajectories in healthy aging: Insights from a longitudinal cohort study.", "journal": "Sleep Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/alz.70247", "url": "https://doi.org/10.1002/alz.70247", "title": "Slow wave synchrony during NREM sleep tracks cognitive impairment in prodromal Alzheimer's disease.", "journal": "Alzheimer's & Dementia", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "sleep/nearable_accuracy", "desk": "sleep", "desk_name": "Sleep", "statement": "An under-mattress sensor detects sleep well and wake poorly, and overstates total sleep by 20 to 48 minutes. 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Older adults sleep less than that, which is what changes, not the target.", "question": "Is seven to eight hours still right for older adults?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-sleep#duration_by_age", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.sleh.2026.05.011", "url": "https://doi.org/10.1016/j.sleh.2026.05.011", "title": "How much sleep do you need: A 10-year systematic review of National Sleep Foundation's sleep duration recommendations and examination of sex differences.", "journal": "Sleep Health", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1139/apnm-2020-0034", "url": "https://doi.org/10.1139/apnm-2020-0034", "title": "Sleep duration and health in adults: an overview of systematic reviews.", "journal": "Applied Physiology, Nutrition, and Metabolism", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/s2213-2600(19)30057-8", "url": "https://doi.org/10.1016/S2213-2600(19)30057-8", "title": "Normal polysomnography parameters in healthy adults: a systematic review and meta-analysis.", "journal": "The Lancet. 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"year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/ehf2.15391", "url": "https://doi.org/10.1002/ehf2.15391", "title": "Prognostic impact of peak oxygen consumption in heart failure: A systematic review and meta-analysis.", "journal": "ESC Heart Failure", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41591-024-03039-x", "url": "https://doi.org/10.1038/s41591-024-03039-x", "title": "Proteomic analysis of cardiorespiratory fitness for prediction of mortality and multisystem disease risks.", "journal": "Nature Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/ajh/hpae137", "url": "https://doi.org/10.1093/ajh/hpae137", "title": "Non-exercise Estimated Cardiorespiratory Fitness and Mortality Among Adults With Hypertension.", "journal": "American Journal of Hypertension", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.cpcardiol.2023.101871", "url": "https://doi.org/10.1016/j.cpcardiol.2023.101871", "title": "The Impact of Light Physical Activity, Sedentary Behavior and Cardiorespiratory Fitness in Extending Lifespan and Healthspan Outcomes: How Little is Still Significant? A Narrative Review.", "journal": "Current Problems in Cardiology", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/10815589221149190", "url": "https://doi.org/10.1177/10815589221149190", "title": "Associations among cardiorespiratory fitness, C-reactive protein, and all-cause mortality in men and women.", "journal": "Journal of Investigative Medicine", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1089/met.2022.0082", "url": "https://doi.org/10.1089/met.2022.0082", "title": "Cardiorespiratory Fitness and All-Cause Mortality in Women with Metabolic Syndrome.", "journal": "Metabolic Syndrome and Related Disorders", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/eci.13770", "url": "https://doi.org/10.1111/eci.13770", "title": "Association between cardiorespiratory fitness and risk of all-cause and cause-specific mortality.", "journal": "European Journal of Clinical Investigation", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/circresaha.118.312669", "url": "https://doi.org/10.1161/CIRCRESAHA.118.312669", "title": "Sedentary Behavior, Exercise, and Cardiovascular Health.", "journal": "Circulation Research", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2741/4657", "url": "https://doi.org/10.2741/4657", "title": "Survival of the fittest: VO 2 max, a key predictor of longevity?", "journal": "Frontiers in Bioscience", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ahj.2017.08.022", "url": "https://doi.org/10.1016/j.ahj.2017.08.022", "title": "Cardiorespiratory fitness versus physical activity as predictors of all-cause mortality in men.", "journal": "American Heart Journal", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/eurheartj/ehw249", "url": "https://doi.org/10.1093/eurheartj/ehw249", "title": "The association between physical activity and risk of mortality is modulated by grip strength and cardiorespiratory fitness: evidence from 498 135 UK-Biobank participants.", "journal": "European Heart Journal", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.5935/abc.20160070", "url": "https://doi.org/10.5935/abc.20160070", "title": "Brazilian Cardiorespiratory Fitness Classification Based on Maximum Oxygen Consumption.", "journal": "Arquivos Brasileiros De Cardiologia", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/bjsports-2016-096860", "url": "https://doi.org/10.1136/bjsports-2016-096860", "title": "Cardiorespiratory fitness and death from cancer: a 42-year follow-up from the Copenhagen Male Study.", "journal": "British Journal of Sports Medicine", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.pcad.2013.09.002", "url": "https://doi.org/10.1016/j.pcad.2013.09.002", "title": "Fitness vs. fatness on all-cause mortality: a meta-analysis.", "journal": "Progress in Cardiovascular Diseases", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/00005768-200106001-00007", "url": "https://doi.org/10.1097/00005768-200106001-00007", "title": "Is physical activity or physical fitness more important in defining health benefits?", "journal": "Medicine and Science in Sports and Exercise", "year": 2001, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/trainability", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Structured aerobic exercise training improves VO2max in healthy adults.", "question": "Does exercise training reliably increase VO2max?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#trainability", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1136/bjsports-2025-110027", "url": "https://doi.org/10.1136/bjsports-2025-110027", "title": "Effect of exercise snacks on fitness and cardiometabolic health in physically inactive individuals: systematic review and meta-analysis.", "journal": "British Journal of Sports Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/sms.70130", "url": "https://doi.org/10.1111/sms.70130", "title": "Six Weeks of Low-Volume Sprint Interval Training Improves Peak Oxygen Uptake Compared to a Non-Exercise Control: A Randomized Controlled Trial.", "journal": "Scandinavian Journal of Medicine & Science in Sports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.archger.2024.105530", "url": "https://doi.org/10.1016/j.archger.2024.105530", "title": "Effect of aerobic training versus resistance training for improving cardiorespiratory fitness and body composition in middle-aged to older adults: A systematic review and meta-analysis of randomized controlled trials.", "journal": "Archives of Gerontology and Geriatrics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1007/s40279-015-0365-0", "url": "https://doi.org/10.1007/s40279-015-0365-0", "title": "Effectiveness of High-Intensity Interval Training (HIT) and Continuous Endurance Training for VO2max Improvements: A Systematic Review and Meta-Analysis of Controlled Trials.", "journal": "Sports Medicine", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1519/jsc.0000000000005415", "url": "https://doi.org/10.1519/JSC.0000000000005415", "title": "Effects of Different Training-Intensity Distribution Models on Maximal Oxygen Uptake and Time-Trial Performance in Endurance Athletes: A Bayesian Network Meta-Analysis.", "journal": "Journal of Strength and Conditioning Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1152/japplphysiol.00267.2026", "url": "https://doi.org/10.1152/japplphysiol.00267.2026", "title": "Effects of 8-wk exercise snacks on muscle oxygenation and cardiometabolic, mitochondrial, and subclinical atherosclerosis markers in sedentary women.", "journal": "Journal of Applied Physiology (Bethesda, Md", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jnha.2026.100940", "url": "https://doi.org/10.1016/j.jnha.2026.100940", "title": "Effects of exercise snacks on cardiorespiratory fitness, body composition, and blood lipids in adults across different age groups: a systematic review and meta-analysis.", "journal": "The Journal of Nutrition, Health & Aging", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/15502783.2026.2675444", "url": "https://doi.org/10.1080/15502783.2026.2675444", "title": "Effects of exercise on metabolic risk, cardiovascular fitness, and body composition in elderly women of the past decade: a systematic review and meta-analysis.", "journal": "Journal of the International Society of Sports Nutrition", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s40279-025-02261-y", "url": "https://doi.org/10.1007/s40279-025-02261-y", "title": "Much Ado About Zone 2: A Narrative Review 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randomized controlled trial.", "journal": "Applied Physiology, Nutrition, and Metabolism", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/0271678x221133861", "url": "https://doi.org/10.1177/0271678X221133861", "title": "One-year aerobic exercise increases cerebral blood flow in cognitively normal older adults.", "journal": "Journal of Cerebral Blood Flow and Metabolism", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1519/jsc.0000000000003516", "url": "https://doi.org/10.1519/JSC.0000000000003516", "title": "High-Intensity Functional Training Improves Cardiorespiratory Fitness and Neuromuscular Performance Without Inflammation or Muscle Damage.", "journal": "Journal of Strength and Conditioning Research", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1139/apnm-2018-0675", "url": "https://doi.org/10.1139/apnm-2018-0675", "title": "Do stair climbing exercise \"snacks\" improve cardiorespiratory fitness?", "journal": "Applied Physiology, Nutrition, and Metabolism", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s00421-019-04160-3", "url": "https://doi.org/10.1007/s00421-019-04160-3", "title": "Cardiorespiratory coordination reveals training-specific physiological adaptations.", "journal": "European Journal of Applied Physiology", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/sms.12092", "url": "https://doi.org/10.1111/sms.12092", "title": "Effects of sprint interval training on VO2max and aerobic exercise performance: A systematic review and meta-analysis.", "journal": "Scandinavian Journal of Medicine & Science in Sports", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/bjsm.2004.012526", "url": "https://doi.org/10.1136/bjsm.2004.012526", "title": "Physiological adaptations to soccer specific endurance training in professional youth soccer players.", "journal": "British Journal of Sports Medicine", "year": 2005, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/wearable_validity", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Consumer wearable devices estimate VO2max accurately enough to be meaningful.", "question": "Are consumer-wearable VO2max estimates accurate against gold-standard testing?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#wearable_validity", "registry_finding": { "id": "KYP-ER-0011", "url": "https://knowyourprime.com/evidence-wearable-vo2-max-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.1371/journal.pone.0356808", "url": "https://doi.org/10.1371/journal.pone.0356808", "title": "The accuracy of VO2 max, heart rate and energy expenditure measurements from Google Pixel Watch 3.", "journal": "PloS One", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: funded by Google" ] } }, { "role": "anchor", "id": "doi:10.1016/j.mcpdig.2026.100357", "url": "https://doi.org/10.1016/j.mcpdig.2026.100357", "title": "Accuracy of VO2 max Estimates From Apple Watch Series 10", "journal": "Mayo Clinic Proceedings Digital Health", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s25010275", "url": "https://doi.org/10.3390/s25010275", "title": "Validation of Aerobic Capacity (VO2max) and Pulse Oximetry in Wearable Technology.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1371/journal.pone.0323741", "url": "https://doi.org/10.1371/journal.pone.0323741", "title": "Investigating the accuracy of Apple Watch VO2 max 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"doi:10.1371/journal.pone.0319760", "url": "https://doi.org/10.1371/journal.pone.0319760", "title": "Estimating oxygen uptake in simulated team sports using machine learning models and wearable sensor data: A pilot study.", "journal": "PloS One", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23063251", "url": "https://doi.org/10.3390/s23063251", "title": "Heart Rate Variability Based Estimation of Maximal Oxygen Uptake in Athletes Using Supervised Regression Models.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1152/japplphysiol.00519.2015", "url": "https://doi.org/10.1152/japplphysiol.00519.2015", "title": "Cardiorespiratory fitness estimation using wearable sensors: Laboratory and free-living analysis of context-specific submaximal heart rates.", "journal": "Journal of Applied Physiology (Bethesda, Md", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/fitness_vs_fatness", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Fit people carry the same mortality risk whether their BMI is normal, overweight or obese. Unfit people carry two to three times that risk at every BMI.", "question": "Does being fit offset the risk of being overweight?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#fitness_vs_fatness", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1136/bjsports-2024-108748", "url": "https://doi.org/10.1136/bjsports-2024-108748", "title": "Cardiorespiratory fitness, body mass index and mortality: a systematic review and meta-analysis.", "journal": "British Journal of Sports Medicine", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.pcad.2013.09.002", "url": "https://doi.org/10.1016/j.pcad.2013.09.002", "title": "Fitness vs. fatness on all-cause mortality: a meta-analysis.", "journal": "Progress in Cardiovascular Diseases", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/estimated_crf_mortality", "desk": "vo2max", "desk_name": "VO2 max", "statement": "A fitness estimate predicts death as well as a laboratory test does. Across 3.8 million observations the risk per extra MET was statistically indistinguishable between measured and estimated fitness.", "question": "Does an estimated fitness score predict lifespan as well as a lab test?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#estimated_crf_mortality", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.jshs.2024.100986", "url": "https://doi.org/10.1016/j.jshs.2024.100986", "title": "Comparison of objectively measured and estimated cardiorespiratory fitness to predict all-cause and cardiovascular disease mortality in adults: A systematic review and meta-analysis of 42 studies representing 35 cohorts and 3.8 million observations.", "journal": "Journal of Sport and Health Science", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/sprint_repetitions", "desk": "vo2max", "desk_name": "VO2 max", "statement": "More sprints in a session does not buy more VO2max. Across 93 trials each extra sprint was worth -0.04%, while each extra week of training was worth 0.7%.", "question": "Do more sprints per session raise VO2 max more?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#sprint_repetitions", "registry_finding": null, "studies": [ { "role": "null_result", "id": "doi:10.1111/sms.70347", "url": "https://doi.org/10.1111/sms.70347", "title": "Number of Sprint Repetitions in a Sprint Interval Training Session Does Not Moderate Improvements in V̇O 2 max With Training: A Systematic Review and Meta-Analysis.", "journal": "Scandinavian Journal of Medicine & Science in Sports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1007/s40279-023-01959-1", "url": "https://doi.org/10.1007/s40279-023-01959-1", "title": "The Effects of Repeated-Sprint Training on Physical Fitness and Physiological Adaptation in Athletes: A Systematic Review and Meta-Analysis.", "journal": "Sports Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/aerobic_vs_resistance", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Aerobic training beats resistance training for VO2max across 38 randomized trials. Resistance training wins on lean body mass, which is a different goal.", "question": "Does cardio beat lifting for VO2 max?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#aerobic_vs_resistance", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.archger.2024.105530", "url": "https://doi.org/10.1016/j.archger.2024.105530", "title": "Effect of aerobic training versus resistance training for improving cardiorespiratory fitness and body composition in middle-aged to older adults: A systematic review and meta-analysis of randomized controlled trials.", "journal": "Archives of Gerontology and Geriatrics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.7717/peerj.17525", "url": "https://doi.org/10.7717/peerj.17525", "title": "Effects of combined aerobic and resistance training on glycemic control, blood pressure, inflammation, cardiorespiratory fitness and quality of life in patients with type 2 diabetes and overweight/obesity: a systematic review and meta-analysis.", "journal": "PeerJ", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jphys.2024.02.018", "url": "https://doi.org/10.1016/j.jphys.2024.02.018", "title": "Some types of exercise interventions are more effective than others in people with coronary heart disease: systematic review and network meta-analysis.", "journal": "Journal of Physiotherapy", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/hiit_vs_continuous", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Interval training clearly raises VO2max. Whether it beats steady-state training for the same goal is not settled: the pooled comparison reads as equal or greater, not better.", "question": "Is HIIT better than steady-state cardio for VO2 max?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#hiit_vs_continuous", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.3390/ijerph20064741", "url": "https://doi.org/10.3390/ijerph20064741", "title": "Effect of High-Intensity Interval Training vs. Moderate-Intensity Continuous Training on Fat Loss and Cardiorespiratory Fitness in the Young and Middle-Aged a Systematic Review and Meta-Analysis.", "journal": "International Journal of Environmental Research and Public Health", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/ijerph17082955", "url": "https://doi.org/10.3390/ijerph17082955", "title": "High Intensity Interval Training (HIIT) Improves Cardiorespiratory Fitness (CRF) in Healthy, Overweight and Obese Adolescents: A Systematic Review and Meta-Analysis of Controlled Studies.", "journal": "International Journal of Environmental Research and Public Health", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1007/s40279-015-0365-0", "url": "https://doi.org/10.1007/s40279-015-0365-0", "title": "Effectiveness of High-Intensity Interval Training (HIT) and Continuous Endurance Training for VO2max Improvements: A Systematic Review and Meta-Analysis of Controlled Trials.", "journal": "Sports Medicine", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/02692155261416862", "url": "https://doi.org/10.1177/02692155261416862", "title": "Effects of high-intensity interval training on cardiorespiratory fitness and metabolic outcomes in type 2 diabetes: A systematic review and meta-analysis.", "journal": "Clinical Rehabilitation", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0314134", "url": "https://doi.org/10.1371/journal.pone.0314134", "title": "Effects of high-intensity interval training versus moderate-intensity continuous training on cardiorespiratory and exercise capacity in patients with coronary artery disease: A systematic review and meta-analysis.", "journal": "PloS One", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jphys.2024.02.018", "url": "https://doi.org/10.1016/j.jphys.2024.02.018", "title": "Some types of exercise interventions are more effective than others in people with coronary heart disease: systematic review and network meta-analysis.", "journal": "Journal of Physiotherapy", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/00005768-199610000-00018", "url": "https://doi.org/10.1097/00005768-199610000-00018", "title": "Effects of moderate-intensity endurance and high-intensity intermittent training on anaerobic capacity and VO2max.", "journal": "Medicine and Science in Sports and Exercise", "year": 1997, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/tracker_fitness", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Wearing an activity tracker produces a small measured improvement in cardiorespiratory fitness, standardized mean difference about 0.3, alongside much larger effects on how much people actually move.", "question": "Does wearing a fitness tracker actually make you fitter?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#tracker_fitness", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/s2589-7500(22)00111-x", "url": "https://doi.org/10.1016/S2589-7500(22)00111-X", "title": "Effectiveness of wearable activity trackers to increase physical activity and improve health: a systematic review of systematic reviews and meta-analyses.", "journal": "The Lancet. Digital Health", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/beetroot_endurance", "desk": "vo2max", "desk_name": "VO2 max", "statement": "A review of 23 trials found beetroot juice improves cardiorespiratory endurance in athletes, mainly by making them more efficient: better performance over various distances and longer time to exhaustion at submaximal intensity. Its effect on VO2 max itself is put only as may improve.", "question": "Does beetroot juice improve endurance?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#beetroot_endurance", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.3390/nu9010043", "url": "https://doi.org/10.3390/nu9010043", "title": "Effects of Beetroot Juice Supplementation on Cardiorespiratory Endurance in Athletes. A Systematic Review.", "journal": "Nutrients", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/glp1_fitness", "desk": "vo2max", "desk_name": "VO2 max", "statement": "GLP-1 drugs take weight off without making you fitter. A randomized trial found cardiorespiratory fitness improved only when structured exercise was added, not from the drug alone, and a 2025 review found substantial fat-free mass loss with no clear evidence of fitness improvement. Losing weight raises your fitness per kilogram on paper while your actual capacity stays put.", "question": "Does Ozempic improve your fitness or VO2 max?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#glp1_fitness", "registry_finding": null, "studies": [ { "role": "null_result", "id": "doi:10.1007/s40279-025-02386-0", "url": "https://doi.org/10.1007/s40279-025-02386-0", "title": "Physical Fitness with Exercise and GLP-1 Receptor Agonist Treatment Alone or Combined After Diet-Induced Weight Loss: A Secondary Analysis of a Randomized Controlled Trial in Adults with Obesity.", "journal": "Sports Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1210/clinem/dgaf335", "url": "https://doi.org/10.1210/clinem/dgaf335", "title": "Incretin Receptor Agonism, Fat-free Mass, and Cardiorespiratory Fitness: A Narrative Review.", "journal": "The Journal of Clinical Endocrinology and Metabolism", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1530/jme-16-0078", "url": "https://doi.org/10.1530/JME-16-0078", "title": "Exendin-4 increases oxygen consumption and thermogenic gene expression in muscle cells.", "journal": "Journal of Molecular Endocrinology", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "vo2max/normative_by_age_sex", "desk": "vo2max", "desk_name": "VO2 max", "statement": "Measured VO2max declines with age by roughly 10 to 16 percent per decade, and percentile reference values by age and sex exist for the United States population.", "question": "What is a good VO2 max for my age?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-17", "url": "https://knowyourprime.com/research-desk-vo2max#normative_by_age_sex", "registry_finding": { "id": "KYP-ER-0015", "url": "https://knowyourprime.com/evidence-vo2-max-by-age-reference" }, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.mayocp.2021.08.020", "url": "https://doi.org/10.1016/j.mayocp.2021.08.020", "title": "Updated Reference Standards for Cardiorespiratory Fitness Measured with Cardiopulmonary Exercise Testing: Data from the Fitness Registry and the Importance of Exercise National Database (FRIEND).", "journal": "Mayo Clinic Proceedings", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.mayocp.2015.07.026", "url": "https://doi.org/10.1016/j.mayocp.2015.07.026", "title": "Reference Standards for Cardiorespiratory Fitness Measured With Cardiopulmonary Exercise Testing: Data From the Fitness Registry and the Importance of Exercise National Database.", "journal": "Mayo Clinic Proceedings", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1249/mss.0000000000004065", "url": "https://doi.org/10.1249/MSS.0000000000004065", "title": "Determinants of Reclassification of Exercise Performance across Cardiopulmonary Exercise Testing Prediction Equations.", "journal": "Medicine and Science in Sports and Exercise", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1111/cpf.12377", "url": "https://doi.org/10.1111/cpf.12377", "title": "Commonly used reference values underestimate oxygen uptake in healthy, 50-year-old Swedish women.", "journal": "Clinical Physiology and Functional Imaging", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1586/14779072.2014.985657", "url": "https://doi.org/10.1586/14779072.2014.985657", "title": "Reference values for cardiopulmonary exercise testing in healthy adults: a systematic review.", "journal": "Expert Review of Cardiovascular Therapy", "year": 2015, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s40279-016-0655-1", "url": "https://doi.org/10.1007/s40279-016-0655-1", "title": "Size Exponents for Scaling Maximal Oxygen Uptake in Over 6500 Humans: A Systematic Review and Meta-Analysis.", "journal": "Sports Medicine", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/detection-accuracy", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Wrist wearables using an optical pulse sensor detect atrial fibrillation accurately enough to screen for it. A positive result needs an ECG to confirm it.", "question": "Do consumer wearables accurately detect AFib from the wrist?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#detection-accuracy", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.2196/56972", "url": "https://doi.org/10.2196/56972", "title": "Real-World Accuracy of Wearable Activity Trackers for Detecting Medical Conditions: Systematic Review and Meta-Analysis", "journal": "JMIR Mhealth and Uhealth", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.jacep.2022.09.011", "url": "https://doi.org/10.1016/j.jacep.2022.09.011", "title": "Clinical Validation of 5 Direct-to-Consumer Wearable Smart Devices to Detect Atrial Fibrillation: BASEL Wearable Study.", "journal": "JACC. Clinical Electrophysiology", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Abbott" ], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1161/circulationaha.122.060291", "url": "https://doi.org/10.1161/CIRCULATIONAHA.122.060291", "title": "Detection of Atrial Fibrillation in a Large Population Using Wearable Devices: The Fitbit Heart Study.", "journal": "Circulation", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [ "Fitbit" ], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/28974", "url": "https://doi.org/10.2196/28974", "title": "Diagnostic Accuracy of Smartwatches for the Detection of Cardiac Arrhythmia: Systematic Review and Meta-analysis.", "journal": "Journal of Medical Internet Research", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.jacc.2019.08.019", "url": "https://doi.org/10.1016/j.jacc.2019.08.019", "title": "Mobile Photoplethysmographic Technology to Detect Atrial Fibrillation.", "journal": "Journal of the American College of Cardiology", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1161/circep.118.006834", "url": "https://doi.org/10.1161/CIRCEP.118.006834", "title": "Smartwatch Performance for the Detection and Quantification of Atrial Fibrillation.", "journal": "Circulation. Arrhythmia and Electrophysiology", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [ "AliveCor" ], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1056/nejmoa1901183", "url": "https://doi.org/10.1056/NEJMoa1901183", "title": "Large-Scale Assessment of a Smartwatch to Identify Atrial Fibrillation.", "journal": "The New England Journal of Medicine", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [ "Apple" ], "funders": [ "Apple" ], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1093/europace/euae181", "url": "https://doi.org/10.1093/europace/euae181", "title": "Reliability of single-lead electrocardiogram interpretation to detect atrial fibrillation: insights from the SAFER feasibility study.", "journal": "Europace", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.ahj.2023.07.003", "url": "https://doi.org/10.1016/j.ahj.2023.07.003", "title": "Accuracy and variability of cardiologist interpretation of single lead electrocardiograms for atrial fibrillation: The VITAL-AF trial.", "journal": "American Heart Journal", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jstrokecerebrovasdis.2026.108693", "url": "https://doi.org/10.1016/j.jstrokecerebrovasdis.2026.108693", "title": "Detection of atrial fibrillation via adhesive single-lead ECG vs. Holter monitoring in embolic stroke of undetermined source: the AVANT-GARDE trial.", "journal": "Journal of Stroke and Cerebrovascular Diseases", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/87142", "url": "https://doi.org/10.2196/87142", "title": "Prediction of Atrial Fibrillation Occurrence With Handheld Mobile Electrocardiogram: Deep Learning Model Development Using Real-World Data.", "journal": "JMIR Medical Informatics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.hlc.2026.02.016", "url": "https://doi.org/10.1016/j.hlc.2026.02.016", "title": "Smartwatch-Based Heart Rate Detection in Atrial, Ventricular and Pulseless Arrhythmias.", "journal": "Heart, Lung & Circulation", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/advs.76627", "url": "https://doi.org/10.1002/advs.76627", "title": "A Dual-Modal Wearable PPG Smartwatch with AI-Enhanced Correction for High-Accuracy and Continuous AF Burden Assessment.", "journal": "Advanced Science", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25030676", "url": "https://doi.org/10.3390/s25030676", "title": "Wear Your Heart on Your Sleeve: Smart Textile ECG Wearables for Comfort, Integration, Signal Quality and Continuous Monitoring in Paroxysmal Atrial Fibrillation.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3233/shti251279", "url": "https://doi.org/10.3233/SHTI251279", "title": "Signal Quality of Smart Shirts Recording Electrocardiography.", "journal": "Studies in Health Technology and Informatics", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/tbme.2024.3476088", "url": "https://doi.org/10.1109/TBME.2024.3476088", "title": "A Novel Deep Ensemble Method for Selective Classification of Electrocardiograms.", "journal": "IEEE Transactions on Bio-medical Engineering", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1186/s12872-025-04582-2", "url": "https://doi.org/10.1186/s12872-025-04582-2", "title": "Diagnostic accuracy of ECG smart chest patches versus PPG smartwatches for atrial fibrillation detection: a systematic review and meta-analysis.", "journal": "BMC Cardiovascular Disorders", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3949/ccjm.91a.23030", "url": "https://doi.org/10.3949/ccjm.91a.23030", "title": "Consumer-grade wearable cardiac monitors: What they do well, and what needs work.", "journal": "Cleveland Clinic Journal of Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacep.2024.01.008", "url": "https://doi.org/10.1016/j.jacep.2024.01.008", "title": "Continuous Atrial Fibrillation Monitoring From Photoplethysmography: Comparison Between Supervised Deep Learning and Heuristic Signal Processing.", "journal": "JACC. Clinical Electrophysiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1088/1361-6579/ad37ee", "url": "https://doi.org/10.1088/1361-6579/ad37ee", "title": "Photoplethysmography based atrial fibrillation detection: a continually growing field.", "journal": "Physiological Measurement", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/pace.14951", "url": "https://doi.org/10.1111/pace.14951", "title": "Evaluation of an algorithm-guided photoplethysmography for atrial fibrillation burden using a smartwatch.", "journal": "Pacing and Clinical Electrophysiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2024.3368049", "url": "https://doi.org/10.1109/JBHI.2024.3368049", "title": "Contact-Free Atrial Fibrillation Screening With Attention Network.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10916-024-02077-9", "url": "https://doi.org/10.1007/s10916-024-02077-9", "title": "Comparison Between a Single-Lead ECG Garment Device and a Holter Monitor: A Signal Quality Assessment.", "journal": "Journal of Medical Systems", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/tbme.2023.3321792", "url": "https://doi.org/10.1109/TBME.2023.3321792", "title": "A Review on Atrial Fibrillation Detection From Ambulatory ECG.", "journal": "IEEE Transactions on Bio-medical Engineering", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jtehm.2024.3397739", "url": "https://doi.org/10.1109/JTEHM.2024.3397739", "title": "Detection of Non-Sustained Supraventricular Tachycardia in Atrial Fibrillation Screening.", "journal": "IEEE Journal of Translational Engineering in Health and Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jce.15892", "url": "https://doi.org/10.1111/jce.15892", "title": "Accuracy of the Apple watch for detection of AF: A multicenter experience.", "journal": "Journal of Cardiovascular Electrophysiology", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23104632", "url": "https://doi.org/10.3390/s23104632", "title": "Accuracy of a Smartwatch to Assess Heart Rate Monitoring and Atrial Fibrillation in Stroke Patients.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23042130", "url": "https://doi.org/10.3390/s23042130", "title": "Signal Quality Analysis for Long-Term ECG Monitoring Using a Health Patch in Cardiac Patients.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2022.3221464", "url": "https://doi.org/10.1109/JBHI.2022.3221464", "title": "Detection of Atrial Fibrillation From Variable-Duration ECG Signal Based on Time-Adaptive Densely Network and Feature Enhancement Strategy.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23125618", "url": "https://doi.org/10.3390/s23125618", "title": "Automated Signal Quality Assessment of Single-Lead ECG Recordings for Early Detection of Silent Atrial Fibrillation.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2021.3131984", "url": "https://doi.org/10.1109/JBHI.2021.3131984", "title": "Atrial Fibrillation Detection and Atrial Fibrillation Burden Estimation via Wearables.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10840-021-01068-x", "url": "https://doi.org/10.1007/s10840-021-01068-x", "title": "Accuracy of pulsatile photoplethysmography applications or handheld devices vs. 12-lead ECG for atrial fibrillation screening: a systematic review and meta-analysis.", "journal": "Journal of Interventional Cardiac Electrophysiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s00392-021-01941-9", "url": "https://doi.org/10.1007/s00392-021-01941-9", "title": "Mobile health solutions for atrial fibrillation detection and management: a systematic review.", "journal": "Clinical Research in Cardiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3349/ymj.2022.63.s93", "url": "https://doi.org/10.3349/ymj.2022.63.S93", "title": "Artificial Intelligence for Detection of Cardiovascular-Related Diseases from Wearable Devices: A Systematic Review and Meta-Analysis.", "journal": "Yonsei Medical Journal", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.hrthm.2022.02.030", "url": "https://doi.org/10.1016/j.hrthm.2022.02.030", "title": "Remote and wearable ECG devices with diagnostic abilities in adults: A state-of-the-science scoping review.", "journal": "Heart Rhythm", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.socscimed.2022.114954", "url": "https://doi.org/10.1016/j.socscimed.2022.114954", "title": "Direct-to-consumer detection of atrial fibrillation in a smartwatch electrocardiogram: Medical overuse, medicalisation and the experience of consumers.", "journal": "Social Science & Medicine", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/s0140-6736(22)01637-3", "url": "https://doi.org/10.1016/S0140-6736(22)01637-3", "title": "Artificial intelligence-guided screening for atrial fibrillation using electrocardiogram during sinus rhythm: a prospective non-randomised interventional trial.", "journal": "Lancet", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jelectrocard.2022.07.069", "url": "https://doi.org/10.1016/j.jelectrocard.2022.07.069", "title": "An automated detection of atrial fibrillation from single‑lead ECG using HRV features and machine learning.", "journal": "Journal of Electrocardiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.hrthm.2021.03.044", "url": "https://doi.org/10.1016/j.hrthm.2021.03.044", "title": "Validation of an algorithm for continuous monitoring of atrial fibrillation using a consumer smartwatch.", "journal": "Heart Rhythm", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [ "Samsung" ], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s00380-021-01991-z", "url": "https://doi.org/10.1007/s00380-021-01991-z", "title": "Effect of the recording condition on the quality of a single-lead electrocardiogram.", "journal": "Heart and Vessels", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ahj.2021.04.003", "url": "https://doi.org/10.1016/j.ahj.2021.04.003", "title": "Rationale and design of a large population study to validate software for the assessment of atrial fibrillation from data acquired by a consumer tracker or smartwatch: The Fitbit heart study.", "journal": "American Heart Journal", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [ "Fitbit" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.acvd.2020.05.015", "url": "https://doi.org/10.1016/j.acvd.2020.05.015", "title": "Diagnostic accuracy of smart gadgets/wearable devices in detecting atrial fibrillation: A systematic review and meta-analysis.", "journal": "Archives of Cardiovascular Diseases", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/circep.121.010063", "url": "https://doi.org/10.1161/CIRCEP.121.010063", "title": "Arrhythmias Other Than Atrial Fibrillation in Those With an Irregular Pulse Detected With a Smartwatch: Findings From the Apple Heart Study.", "journal": "Circulation. Arrhythmia and Electrophysiology", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "author affiliations include Apple" ] } }, { "role": "supporting", "id": "doi:10.1093/jamia/ocaa137", "url": "https://doi.org/10.1093/jamia/ocaa137", "title": "Clinical evaluation and diagnostic yield following evaluation of abnormal pulse detected using Apple Watch.", "journal": "Journal of the American Medical Informatics Association", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/heartjnl-2020-316958", "url": "https://doi.org/10.1136/heartjnl-2020-316958", "title": "Heartbeat: smartwatch devices for detection of atrial fibrillation.", "journal": "Heart", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/anec.12682", "url": "https://doi.org/10.1111/anec.12682", "title": "Assessment of signal quality measured with a smart 12-lead ECG acquisition T-shirt.", "journal": "Annals of Noninvasive Electrocardiology", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.tcm.2019.10.010", "url": "https://doi.org/10.1016/j.tcm.2019.10.010", "title": "How useful is the smartwatch ECG?", "journal": "Trends in Cardiovascular Medicine", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacep.2018.10.006", "url": "https://doi.org/10.1016/j.jacep.2018.10.006", "title": "The WATCH AF Trial: SmartWATCHes for Detection of Atrial Fibrillation.", "journal": "JACC. Clinical Electrophysiology", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0227401", "url": "https://doi.org/10.1371/journal.pone.0227401", "title": "Machine learning detection of Atrial Fibrillation using wearable technology.", "journal": "PloS One", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jelectrocard.2018.10.096", "url": "https://doi.org/10.1016/j.jelectrocard.2018.10.096", "title": "Continuous heart rate monitoring for automatic detection of atrial fibrillation with novel bio-sensing technology.", "journal": "Journal of Electrocardiology", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc.2019.8856928", "url": "https://doi.org/10.1109/EMBC.2019.8856928", "title": "Smartwatch Based Atrial Fibrillation Detection from Photoplethysmography Signals.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s13239-016-0256-z", "url": "https://doi.org/10.1007/s13239-016-0256-z", "title": "Accurate, Automated Detection of Atrial Fibrillation in Ambulatory Recordings.", "journal": "Cardiovascular Engineering and Technology", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2016.2615316", "url": "https://doi.org/10.1109/JBHI.2016.2615316", "title": "Quality Assessment of Ambulatory ECG Using Wavelet Entropy of the HRV Signal.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/screening-outcomes", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Population-level screening for atrial fibrillation using wearable or ambulatory ECG technology reduces stroke and related clinical harms.", "question": "Does wearable-based AF screening improve clinical outcomes like stroke prevention?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#screening-outcomes", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1080/07853890.2025.2457522", "url": "https://doi.org/10.1080/07853890.2025.2457522", "title": "Clinical outcomes of atrial fibrillation screening: a meta-analysis of randomized controlled trials.", "journal": "Annals of Medicine", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1001/jamacardio.2021.0038", "url": "https://doi.org/10.1001/jamacardio.2021.0038", "title": "Screening for Atrial Fibrillation in the Older Population: A Randomized Clinical Trial.", "journal": "JAMA Cardiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/s0140-6736(21)01698-6", "url": "https://doi.org/10.1016/S0140-6736(21)01698-6", "title": "Implantable loop recorder detection of atrial fibrillation to prevent stroke (The LOOP Study): a randomised controlled trial.", "journal": "Lancet", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/s0140-6736(21)01637-8", "url": "https://doi.org/10.1016/S0140-6736(21)01637-8", "title": "Clinical outcomes in systematic screening for atrial fibrillation (STROKESTOP): a multicentre, parallel group, unmasked, randomised controlled trial.", "journal": "Lancet", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1002/14651858.cd009586.pub3", "url": "https://doi.org/10.1002/14651858.CD009586.pub3", "title": "Systematic screening for the detection of atrial fibrillation.", "journal": "The Cochrane Database of Systematic Reviews", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1080/02813432.2026.2656694", "url": "https://doi.org/10.1080/02813432.2026.2656694", "title": "Overdiagnosis in atrial fibrillation screening with wearables.", "journal": "Scandinavian Journal of Primary Health Care", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.1016/j.hrthm.2025.07.060", "url": "https://doi.org/10.1016/j.hrthm.2025.07.060", "title": "PPG-based smartphone application vs usual care for atrial fibrillation screening: A European multicenter randomized trial.", "journal": "Heart Rhythm", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacc.2025.11.032", "url": "https://doi.org/10.1016/j.jacc.2025.11.032", "title": "Enhanced Detection and Prompt Diagnosis of Atrial Fibrillation Using Apple Watch: A Randomized Controlled Trial.", "journal": "Journal of the American College of Cardiology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Apple" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacc.2025.09.024", "url": "https://doi.org/10.1016/j.jacc.2025.09.024", "title": "Atrial Fibrillation Screening According to Genetic Risk: A Secondary Analysis of the Randomized LOOP Study.", "journal": "Journal of the American College of Cardiology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/s0140-6736(25)02166-x", "url": "https://doi.org/10.1016/S0140-6736(25)02166-X", "title": "Atrial fibrillation.", "journal": "Lancet", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1186/s12872-026-06253-2", "url": "https://doi.org/10.1186/s12872-026-06253-2", "title": "Opportunistic and systematic screening for atrial fibrillation in adults aged ≥ 65 years in primary care: a systematic review of randomized and cluster randomized trials.", "journal": "BMC Cardiovascular Disorders", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.5694/mja2.70208", "url": "https://doi.org/10.5694/mja2.70208", "title": "Evidence for Decreasing the Age of Atrial Fibrillation Screening for Indigenous People in Australia: A Systematic Review With Meta-Analysis.", "journal": "The Medical Journal of Australia", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1001/jama.2025.15440", "url": "https://doi.org/10.1001/jama.2025.15440", "title": "Remote Screening for Asymptomatic Atrial Fibrillation: The AMALFI Randomized Clinical Trial.", "journal": "JAMA", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/qjmed/hcaf001", "url": "https://doi.org/10.1093/qjmed/hcaf001", "title": "Risk-based screening for the evaluation of atrial fibrillation in general practice (R-BEAT): a randomized cross-over trial.", "journal": "QJM", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jacc.2024.08.019", "url": "https://doi.org/10.1016/j.jacc.2024.08.019", "title": "Effect of Screening for Undiagnosed Atrial Fibrillation on Stroke Prevention.", "journal": "Journal of the American College of Cardiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41591-022-01979-w", "url": "https://doi.org/10.1038/s41591-022-01979-w", "title": "Smartphone-based screening for atrial fibrillation: a pragmatic randomized clinical trial.", "journal": "Nature Medicine", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s00392-021-01941-9", "url": "https://doi.org/10.1007/s00392-021-01941-9", "title": "Mobile health solutions for atrial fibrillation detection and management: a systematic review.", "journal": "Clinical Research in Cardiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1161/strokeaha.117.017083", "url": "https://doi.org/10.1161/STROKEAHA.117.017083", "title": "Atrial Fibrillation Detection: Fishing for An Irregular Heartbeat Before and After Stroke.", "journal": "Stroke", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/reader_variability", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Two cardiologists reading the same single-lead strip often reach different verdicts. Agreement is moderate, variability runs to 30 percent, and confidence stays high regardless.", "question": "Do cardiologists disagree when reading a smartwatch ECG strip?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#reader_variability", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.ahj.2023.07.003", "url": "https://doi.org/10.1016/j.ahj.2023.07.003", "title": "Accuracy and variability of cardiologist interpretation of single lead electrocardiograms for atrial fibrillation: The VITAL-AF trial.", "journal": "American Heart Journal", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1093/europace/euae181", "url": "https://doi.org/10.1093/europace/euae181", "title": "Reliability of single-lead electrocardiogram interpretation to detect atrial fibrillation: insights from the SAFER feasibility study.", "journal": "Europace", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/65139", "url": "https://doi.org/10.2196/65139", "title": "Comparative Evaluation of Consumer Wearable Devices for Atrial Fibrillation Detection: Validation Study.", "journal": "JMIR Formative Research", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "acknowledgements: Qompium, maker of the FibriCheck app tested, supplied the devices" ] } }, { "role": "supporting", "id": "doi:10.4997/jrcpe.2012.s02", "url": "https://doi.org/10.4997/JRCPE.2012.S02", "title": "How can we best detect atrial fibrillation?", "journal": "The Journal of the Royal College of Physicians of Edinburgh", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/screening_overdiagnosis", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Continuous wearable screening nearly triples atrial fibrillation diagnoses and doubles anticoagulant use without clearly reducing adverse events. Overdiagnosis estimates run from 8 to 29 percent.", "question": "Does wearable AFib screening overdiagnose?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#screening_overdiagnosis", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1080/02813432.2026.2656694", "url": "https://doi.org/10.1080/02813432.2026.2656694", "title": "Overdiagnosis in atrial fibrillation screening with wearables.", "journal": "Scandinavian Journal of Primary Health Care", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.hrthm.2026.01.023", "url": "https://doi.org/10.1016/j.hrthm.2026.01.023", "title": "Incidental ambulatory ECG findings during atrial fibrillation screening in community-based populations: A systematic review and meta-analysis.", "journal": "Heart Rhythm", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/26161", "url": "https://doi.org/10.2196/26161", "title": "Impact of Mobile Health Devices for the Detection of Atrial Fibrillation: Systematic Review.", "journal": "JMIR mHealth and uHealth", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4997/jrcpe.2012.s02", "url": "https://doi.org/10.4997/JRCPE.2012.S02", "title": "How can we best detect atrial fibrillation?", "journal": "The Journal of the Royal College of Physicians of Edinburgh", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/cuffless_bp", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Cuffless wearable blood pressure is closer on diastolic than systolic and still needs calibration. Even the wrist monitors that use a real cuff have only two devices validated to standard.", "question": "Does a cuffless blood pressure wearable work?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#cuffless_bp", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1007/s00404-025-08301-2", "url": "https://doi.org/10.1007/s00404-025-08301-2", "title": "Non-invasive blood pressure monitoring using wearables for cardiovascular risk assessment: a systematic review.", "journal": "Archives of Gynecology and Obstetrics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1038/s41440-026-02759-6", "url": "https://doi.org/10.1038/s41440-026-02759-6", "title": "Validation of ring-type cuffless blood pressure (BP) monitoring device for detecting awake-asleep BP variations compared to ambulatory BP monitoring device.", "journal": "Hypertension Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "funding statement: sponsored by Sky Labs, maker of the CART BP ring tested, which took part in study design and data collection" ] } }, { "role": "supporting", "id": "doi:10.1097/hjh.0000000000004415", "url": "https://doi.org/10.1097/HJH.0000000000004415", "title": "Wearable wrist-watch type cuff oscillometric blood pressure monitors: consensus statement by the European Society of Hypertension Working Group on blood pressure monitoring.", "journal": "Journal of Hypertension", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/tbme.2024.3434344", "url": "https://doi.org/10.1109/TBME.2024.3434344", "title": "Wearable Blood Pressure Monitoring Devices: Understanding Heterogeneity in Design and Evaluation.", "journal": "IEEE Transactions on Bio-medical Engineering", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/ecg_detection", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "A wearable ECG patch is reliable enough to diagnose atrial fibrillation, at 92 to 98 percent sensitivity, and finds more episodes than a short Holter recording.", "question": "Is a wearable ECG good enough to diagnose AFib?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#ecg_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1080/14796678.2026.2689050", "url": "https://doi.org/10.1080/14796678.2026.2689050", "title": "Wearable devices for atrial fibrillation: diagnostic and screening roles of ECG and PPG-A systematic review.", "journal": "Future Cardiology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.ahj.2023.07.003", "url": "https://doi.org/10.1016/j.ahj.2023.07.003", "title": "Accuracy and variability of cardiologist interpretation of single lead electrocardiograms for atrial fibrillation: The VITAL-AF trial.", "journal": "American Heart Journal", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1136/heartjnl-2019-316277", "url": "https://doi.org/10.1136/heartjnl-2019-316277", "title": "Atrial fibrillation detection with a portable device during cardiovascular screening in primary care.", "journal": "Heart", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/65139", "url": "https://doi.org/10.2196/65139", "title": "Comparative Evaluation of Consumer Wearable Devices for Atrial Fibrillation Detection: Validation Study.", "journal": "JMIR Formative Research", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "acknowledgements: Qompium, maker of the FibriCheck app tested, supplied the devices" ] } } ] }, { "id": "ecg/bp_monitor_af_detection", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "An automated blood pressure monitor running an atrial fibrillation algorithm picks up AF at around 99 to 100 percent sensitivity and 89 to 93 percent specificity. Every source says the same thing about what that is worth: it is a screening result that still needs an ECG to confirm it.", "question": "Can a blood pressure monitor detect atrial fibrillation?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#bp_monitor_af_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1097/hjh.0000000000002201", "url": "https://doi.org/10.1097/HJH.0000000000002201", "title": "Blood pressure measurement in atrial fibrillation: review and meta-analysis of evidence on accuracy and clinical relevance.", "journal": "Journal of Hypertension", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/mbp.0000000000000645", "url": "https://doi.org/10.1097/MBP.0000000000000645", "title": "Diagnostic accuracy of an oscillometric blood pressure monitor for atrial fibrillation screening.", "journal": "Blood Pressure Monitoring", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2147/vhrm.s317859", "url": "https://doi.org/10.2147/VHRM.S317859", "title": "Detection of Atrial Fibrillation Using a Home Blood Pressure Monitor.", "journal": "Vascular Health and Risk Management", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/bmjopen-2015-010745", "url": "https://doi.org/10.1136/bmjopen-2015-010745", "title": "Opportunistic screening of atrial fibrillation by automatic blood pressure measurement in the community.", "journal": "BMJ Open", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ijcard.2015.10.182", "url": "https://doi.org/10.1016/j.ijcard.2015.10.182", "title": "Screening for atrial fibrillation with automated blood pressure measurement: Research evidence and practice recommendations.", "journal": "International Journal of Cardiology", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4997/jrcpe.2012.s02", "url": "https://doi.org/10.4997/JRCPE.2012.S02", "title": "How can we best detect atrial fibrillation?", "journal": "The Journal of the Royal College of Physicians of Edinburgh", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/smartphone_af_detection", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "A phone camera, pointed at a fingertip or at your face, detects atrial fibrillation at roughly 96 percent sensitivity and 97 percent specificity. In a general population most of its positives are still false, so what it does reliably is rule atrial fibrillation out, not in.", "question": "Can a phone camera detect atrial fibrillation?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#smartphone_af_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1089/tmj.2024.0579", "url": "https://doi.org/10.1089/tmj.2024.0579", "title": "Smartphone-Based Applications for Atrial Fibrillation Detection: A Systematic Review and Meta-Analysis of Diagnostic Test Accuracy.", "journal": "Telemedicine Journal and E-health", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1001/jamanetworkopen.2020.2064", "url": "https://doi.org/10.1001/jamanetworkopen.2020.2064", "title": "Accuracy of Smartphone Camera Applications for Detecting Atrial Fibrillation: A Systematic Review and Meta-analysis.", "journal": "JAMA Network Open", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/europace/euae065", "url": "https://doi.org/10.1093/europace/euae065", "title": "Real-world validation of smartphone-based photoplethysmography for rate and rhythm monitoring in atrial fibrillation.", "journal": "Europace", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2022.3220656", "url": "https://doi.org/10.1109/JBHI.2022.3220656", "title": "PFDNet: A Pulse Feature Disentanglement Network for Atrial Fibrillation Screening From Facial Videos.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1093/europace/euz119", "url": "https://doi.org/10.1093/europace/euz119", "title": "Atrial fibrillation screening with photo-plethysmography through a smartphone camera.", "journal": "Europace", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "ecg/patch_vs_holter", "desk": "ecg", "desk_name": "Wearable ECG", "statement": "Individual studies find a multi-day ECG patch catches roughly twice the atrial fibrillation a 24-hour Holter does. The one meta-analysis that pooled them found no significant difference, on confidence intervals so wide they rule out almost nothing. The question is open, not settled either way.", "question": "Does a 14-day ECG patch find more than a 24-hour Holter?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Multiple supporting studies are consistent with the core relationship.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-ecg#patch_vs_holter", "registry_finding": null, "studies": [ { "role": "null_result", "id": "pmid:42525983", "url": "https://pubmed.ncbi.nlm.nih.gov/42525983/", "title": "Abstract: 14-Day ECG Patch vs 24-Hour Holter Monitoring for Detection of Clinically Significant Arrhythmias: A Systematic Review and Meta-Analysis.", "journal": "South Dakota Medicine", "year": 2026, "industry_ties": { "checked": false } }, { "role": "supporting", "id": "doi:10.1016/j.medcli.2026.107502", "url": "https://doi.org/10.1016/j.medcli.2026.107502", "title": "Effectiveness of cardiac Holter monitoring for more than four weeks for the detection of occult atrial fibrillation in embolic stroke of undetermined source.", "journal": "Medicina Clinica", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/17474930251398615", "url": "https://doi.org/10.1177/17474930251398615", "title": "Prevalence and predictors of atrial fibrillation detected after stroke or transient ischemic attack: A comprehensive meta-analysis.", "journal": "International Journal of Stroke", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3346/jkms.2025.40.e168", "url": "https://doi.org/10.3346/jkms.2025.40.e168", "title": "A Patch-Type Electrocardiography Is Superior to Holter Monitoring for Detecting Paroxysmal Cardiac Arrhythmias.", "journal": "Journal of Korean Medical Science", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ijcard.2021.03.015", "url": "https://doi.org/10.1016/j.ijcard.2021.03.015", "title": "Enhanced detection of cardiac arrhythmias utilizing 14-day continuous ECG patch monitoring.", "journal": "International Journal of Cardiology", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4997/jrcpe.2012.s02", "url": "https://doi.org/10.4997/JRCPE.2012.S02", "title": "How can we best detect atrial fibrillation?", "journal": "The Journal of the Royal College of Physicians of Edinburgh", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/metabolic-insight", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "CGM traces track what someone has eaten closely enough to be informative about diet. What those traces mean for long-term metabolic health is rated separately.", "question": "Does a CGM tell you anything useful about your diet?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#metabolic-insight", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1177/19322968251361555", "url": "https://doi.org/10.1177/19322968251361555", "title": "Continuous Glucose Measurements for Diet Monitoring in Healthy Adults.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1038/s41467-026-70308-3", "url": "https://doi.org/10.1038/s41467-026-70308-3", "title": "Associations of continuous glucose monitor derived time in range and glycaemic variability with diet lifestyle and demographics.", "journal": "Nature Communications", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: authors include ZOE co-founders, employees and consultants" ] } }, { "role": "anchor", "id": "doi:10.1016/j.ajcnut.2025.07.026", "url": "https://doi.org/10.1016/j.ajcnut.2025.07.026", "title": "Associations of diet composition and quality with continuous glucose monitor-derived glycemic metrics in a community-based cohort.", "journal": "The American Journal of Clinical Nutrition", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "funding statement: Dexcom provided the CGMs at a discounted rate" ] } }, { "role": "conflicting", "id": "doi:10.1093/jn/nxab227", "url": "https://doi.org/10.1093/jn/nxab227", "title": "Individual Postprandial Glycemic Responses to Diet in n-of-1 Trials: Westlake N-of-1 Trials for Macronutrient Intake (WE-MACNUTR).", "journal": "The Journal of Nutrition", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1186/s12874-025-02748-2", "url": "https://doi.org/10.1186/s12874-025-02748-2", "title": "Beyond scalar metrics: functional data analysis of postprandial continuous glucose monitoring in the AEGIS study.", "journal": "BMC Medical Research Methodology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/19322968261427488", "url": "https://doi.org/10.1177/19322968261427488", "title": "Continuous Glucose Monitoring-Derived Glycemic Profiles in Adolescents With Obesity Without Diabetes.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Dexcom" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/19322968261431860", "url": "https://doi.org/10.1177/19322968261431860", "title": "Use of Continuous Glucose Monitoring With Machine Learning to Identify Metabolic Subphenotypes and Inform Precision Lifestyle Changes.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [ "Google" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/19322968261427499", "url": "https://doi.org/10.1177/19322968261427499", "title": "A Wavelet AI Algorithm to Automatically Identify Postprandial Glucose Responses From Continuous Glucose Monitoring Profiles in People Without Diabetes.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-026-50699-5", "url": "https://doi.org/10.1038/s41598-026-50699-5", "title": "Performance of continuous glucose monitoring-based meal detection algorithms in young healthy adults.", "journal": "Scientific Reports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26051624", "url": "https://doi.org/10.3390/s26051624", "title": "Beyond Euglycemia: Case Studies Using Continuous Glucose Monitoring in Elite Athletes Without Diabetes During Record Athletic Events.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: five authors have consulted for, worked at or advised Supersapiens; one now advises Dexcom" ] } }, { "role": "supporting", "id": "doi:10.1177/19322968241274800", "url": "https://doi.org/10.1177/19322968241274800", "title": "Estimating Breakfast Characteristics Using Continuous Glucose Monitoring and Machine Learning in Adults With or at Risk of Type 2 Diabetes.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1002/oby.23637", "url": "https://doi.org/10.1002/oby.23637", "title": "Eight-hour time-restricted eating does not lower daily myofibrillar protein synthesis rates: A randomized control trial.", "journal": "Obesity", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.nutres.2020.06.001", "url": "https://doi.org/10.1016/j.nutres.2020.06.001", "title": "Diet-induced differences in estimated plasma glucose concentrations in healthy, non-diabetic adults are detected by continuous glucose monitoring-a randomized crossover trial.", "journal": "Nutrition Research", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/1932296820905904", "url": "https://doi.org/10.1177/1932296820905904", "title": "Effect of Exercise and Meals on Continuous Glucose Monitor Data in Healthy Individuals Without Diabetes.", "journal": "Journal of Diabetes Science and Technology", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: an author has Dexcom research grants and sits on its advisory board" ] } }, { "role": "supporting", "id": "doi:10.3390/nu13093092", "url": "https://doi.org/10.3390/nu13093092", "title": "Impact of Lifestyle Behaviors on Postprandial Hyperglycemia during Continuous Glucose Monitoring in Adult Males with Overweight/Obesity but without Diabetes.", "journal": "Nutrients", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pbio.2005143", "url": "https://doi.org/10.1371/journal.pbio.2005143", "title": "Glucotypes reveal new patterns of glucose dysregulation.", "journal": "PLoS Biology", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/behavior-change", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "Using a continuous glucose monitor changes eating or exercise behavior in ways that measurably improve glycemic control for non-diabetic users.", "question": "Does using a CGM change behavior in a way that improves glycemic outcomes for people without diabetes?", "rating": { "label": "Emerging", "code": "emerging", "definition": "Evidence currently favors the claim, but more confirmation is needed.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#behavior-change", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1177/19322968261426376", "url": "https://doi.org/10.1177/19322968261426376", "title": "Continuous Glucose Monitoring-Derived Glucose Metrics Over Time in Physically Active Adults Without Diabetes Using a Commercial Continuous Glucose Monitoring Application.", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: authors consulted for or were employed by Supersapiens, whose app and sensor were used" ] } }, { "role": "anchor", "id": "doi:10.3390/medicina62091814", "url": "https://doi.org/10.3390/medicina62091814", "title": "Behavioral and Psychosocial Effects of Participant-Visible Continuous Glucose Monitoring in Adults Without Diabetes: A Systematic Review.", "journal": "Medicina", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1080/15502783.2025.2561670", "url": "https://doi.org/10.1080/15502783.2025.2561670", "title": "Comparative effects of continuous glucose monitoring-informed and traditional interval-based carbohydrate refueling protocols on endurance exercise responses: an exploratory study.", "journal": "Journal of the International Society of Sports Nutrition", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1186/s12966-024-01692-6", "url": "https://doi.org/10.1186/s12966-024-01692-6", "title": "The efficacy of using continuous glucose monitoring as a behaviour change tool in populations with and without diabetes: a systematic review and meta-analysis of randomised controlled trials.", "journal": "The International Journal of Behavioral Nutrition and Physical Activity", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1111/dme.15369", "url": "https://doi.org/10.1111/dme.15369", "title": "Innovative solution or cause for concern? The use of continuous glucose monitors in people not living with diabetes: A narrative review.", "journal": "Diabetic Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/nu17091507", "url": "https://doi.org/10.3390/nu17091507", "title": "Effects of Individualized Nutrition Therapy and Continuous Glucose Monitoring on Dietary and Sleep Quality in Individuals with Prediabetes and Overweight or Obesity.", "journal": "Nutrients", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/14195", "url": "https://doi.org/10.2196/14195", "title": "Examining the Use of Glucose and Physical Activity Self-Monitoring Technologies in Individuals at Moderate to High Risk of Developing Type 2 Diabetes: Randomized Trial.", "journal": "JMIR mHealth and uHealth", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/prediabetes_detection", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "One study separated pre-diabetic from normal glucose on CGM metrics, another found the groups overlapped substantially and CGM added nothing beyond a blood test, and a JAMA review calls the prediabetes evidence limited and indirect.", "question": "Can a CGM catch prediabetes before a blood test would?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#prediabetes_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1001/jamainternmed.2026.2772", "url": "https://doi.org/10.1001/jamainternmed.2026.2772", "title": "Continuous Glucose Monitoring in Type 2 Diabetes and Beyond: A Review.", "journal": "JAMA Internal Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1038/s41598-024-56933-2", "url": "https://doi.org/10.1038/s41598-024-56933-2", "title": "Metabolic health tracking using Ultrahuman M1 continuous glucose monitoring platform in non- and pre-diabetic Indians: a multi-armed observational study.", "journal": "Scientific Reports", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [ "Ultrahuman" ], "funders": [ "Ultrahuman" ], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.3390/medicina62081539", "url": "https://doi.org/10.3390/medicina62081539", "title": "Limited Discriminatory Capacity of Continuous Glucose Monitoring in Prediabetes and Increased Diabetes Risk: A Cross-Sectional Study.", "journal": "Medicina", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1210/clinem/dgae626", "url": "https://doi.org/10.1210/clinem/dgae626", "title": "Defining Continuous Glucose Monitor Time in Range in a Large, Community-Based Cohort Without Diabetes.", "journal": "The Journal of Clinical Endocrinology and Metabolism", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Dexcom" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1089/dia.2024.0226", "url": "https://doi.org/10.1089/dia.2024.0226", "title": "From Stability to Variability: Classification of Healthy Individuals, Prediabetes, and Type 2 Diabetes Using Glycemic Variability Indices from Continuous Glucose Monitoring Data.", "journal": "Diabetes Technology & Therapeutics", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-025-18119-2", "url": "https://doi.org/10.1038/s41598-025-18119-2", "title": "Glucodensity functional profiles outperform traditional continuous glucose monitoring metrics.", "journal": "Scientific Reports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pbio.2005143", "url": "https://doi.org/10.1371/journal.pbio.2005143", "title": "Glucotypes reveal new patterns of glucose dysregulation.", "journal": "PLoS Biology", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.diabres.2018.05.026", "url": "https://doi.org/10.1016/j.diabres.2018.05.026", "title": "Continuous glucose monitoring is more sensitive than HbA1c and fasting glucose in detecting dysglycaemia in a Spanish population without diabetes.", "journal": "Diabetes Research and Clinical Practice", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/hypoxia_accuracy", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "Both major CGM sensors lost accuracy under low oxygen. Error against a blood reference reached 21% for FreeStyle Libre and 42% for Dexcom G6 in healthy volunteers.", "question": "Does a CGM still read correctly at altitude?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#hypoxia_accuracy", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1177/15209156261423954", "url": "https://doi.org/10.1177/15209156261423954", "title": "Accuracy of Dexcom G6® and FreeStyle Libre® Sensors in Standardized Hypoxia Conditions: A Randomized Controlled Trial-FOX Study.", "journal": "Diabetes Technology & Therapeutics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: two authors have received honoraria or other payments from Abbott" ] } } ] }, { "id": "cgm/rate_of_change_diet", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "Changing what you eat moved CGM rate-of-change metrics measurably. Two weeks of added exercise did not.", "question": "Does diet move your glucose swings more than exercise?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#rate_of_change_diet", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.3390/nu18142374", "url": "https://doi.org/10.3390/nu18142374", "title": "Dietary Intervention Is Associated with Lower CGM-Derived Glucose Rate-of-Change in Healthy Young Women: A Pilot Fixed Sequential-Intervention Study.", "journal": "Nutrients", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/dom.14167", "url": "https://doi.org/10.1111/dom.14167", "title": "The effect of a low glycaemic index diet on reducing day-long glycaemia in healthy young adults: A randomized crossover trial.", "journal": "Diabetes, Obesity & Metabolism", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/15209156251390822", "url": "https://doi.org/10.1177/15209156251390822", "title": "Normal Reference Range for Glucose Rates of Change in Nondiabetic Individuals Using Continuous Glucose Monitoring.", "journal": "Diabetes Technology & Therapeutics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jdi.14104", "url": "https://doi.org/10.1111/jdi.14104", "title": "Delayed dinnertime impairs glucose tolerance in healthy young adults.", "journal": "Journal of Diabetes Investigation", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/1753-0407.13549", "url": "https://doi.org/10.1111/1753-0407.13549", "title": "Exercise-induced improvement of glycemic fluctuation and its relationship with fat and muscle distribution in type 2 diabetes.", "journal": "Journal of Diabetes", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-023-48063-y", "url": "https://doi.org/10.1038/s41598-023-48063-y", "title": "The effect of bodyweight exercise on 24-h glycemic responses determined by continuous glucose monitoring in healthy inactive adults: a randomized crossover study.", "journal": "Scientific Reports", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/tir_cardiovascular_risk", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "Time in range tracked predicted cardiovascular risk across 3,634 people without diabetes, at an AUC of 0.75. That is predicted risk, not observed events, in an analysis the authors call exploratory.", "question": "Does your time in range say anything about heart risk?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#tir_cardiovascular_risk", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1038/s41467-026-70308-3", "url": "https://doi.org/10.1038/s41467-026-70308-3", "title": "Associations of continuous glucose monitor derived time in range and glycaemic variability with diet lifestyle and demographics.", "journal": "Nature Communications", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: authors include ZOE co-founders, employees and consultants" ] } }, { "role": "supporting", "id": "doi:10.3390/s25010187", "url": "https://doi.org/10.3390/s25010187", "title": "Non-Invasive Continuous Glucose Monitoring in Patients Without Diabetes: Use in Cardiovascular Prevention-A Systematic Review.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "cgm/measurement_accuracy_nondiabetic", "desk": "cgm", "desk_name": "Continuous glucose monitoring", "statement": "Consumer continuous glucose monitors agree closely with blood glucose reference measurements in people without diabetes.", "question": "How accurate is a continuous glucose monitor if you do not have diabetes?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Multiple supporting studies are consistent with the core relationship.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "At least one unresolved conflicting study bears on the core claim, capping the rating until reconciled.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-cgm#measurement_accuracy_nondiabetic", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1177/19322968261482150", "url": "https://doi.org/10.1177/19322968261482150", "title": "Agreement of Over-the-Counter Continuous Glucose Monitors With Capillary-Meter Glucose in Young Adults Without Diabetes", "journal": "Journal of Diabetes Science and Technology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.ajcnut.2025.02.024", "url": "https://doi.org/10.1016/j.ajcnut.2025.02.024", "title": "Continuous glucose monitor overestimates glycemia, with the magnitude of bias varying by postprandial test and individual - a randomized crossover trial.", "journal": "The American Journal of Clinical Nutrition", "year": 2025, 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Wearfit Study.", "journal": "Journal of Sports Science & Medicine", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.gaitpost.2022.08.004", "url": "https://doi.org/10.1016/j.gaitpost.2022.08.004", "title": "Step-count outcomes of 13 different activity trackers: Results from laboratory and free-living experiments.", "journal": "Gait & Posture", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: an author received research funding from Omron, whose trackers were among those tested" ] } }, { "role": "supporting", "id": "doi:10.1136/bjsports-2020-103147", "url": "https://doi.org/10.1136/bjsports-2020-103147", "title": "Recommendations for determining the validity of consumer wearable and smartphone step count: expert statement and checklist of the INTERLIVE network.", "journal": "British Journal of 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"https://doi.org/10.1249/MSS.0000000000001966", "title": "Standardizing Analytic Methods and Reporting in Activity Monitor Validation Studies.", "journal": "Medicine and Science in Sports and Exercise", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/ijerph16173037", "url": "https://doi.org/10.3390/ijerph16173037", "title": "Validity of Wrist-Worn Activity Trackers for Estimating VO 2max and Energy Expenditure.", "journal": "International Journal of Environmental Research and Public Health", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/14534", "url": "https://doi.org/10.2196/14534", "title": "Accuracy of the Multisensory Wristwatch Polar Vantage's Estimation of Energy Expenditure in Various Activities: Instrument Validation Study.", "journal": "JMIR mHealth and uHealth", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/1460458217720399", "url": "https://doi.org/10.1177/1460458217720399", "title": "Fitness band accuracy in older community dwelling adults.", "journal": "Health Informatics Journal", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.5435/jaaos-d-18-00319", "url": "https://doi.org/10.5435/JAAOS-D-18-00319", "title": "A Step in the Right Direction: Body Location Determines Activity Tracking Device Accuracy in Total Knee and Hip Arthroplasty Patients.", "journal": "The Journal of the American Academy of Orthopaedic Surgeons", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1615/critrevbiomedeng.2019026110", "url": "https://doi.org/10.1615/CritRevBiomedEng.2019026110", "title": "Feasibility of Commercially Marketed Health Devices for Potential Clinical Application.", "journal": "Critical Reviews in Biomedical Engineering", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/sms.13488", "url": "https://doi.org/10.1111/sms.13488", "title": "Validity of energy expenditure estimation methods during 10 days of military training.", "journal": "Scandinavian Journal of Medicine & Science in Sports", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/0309364618767138", "url": "https://doi.org/10.1177/0309364618767138", "title": "Step count accuracy of StepWatch and FitBit One™ among individuals with a unilateral transtibial amputation.", "journal": "Prosthetics and Orthotics International", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1089/tmj.2017.0264", "url": "https://doi.org/10.1089/tmj.2017.0264", "title": "Validity and Reliability Evaluation of Four Commercial Activity Trackers' Step Counting Performance.", "journal": "Telemedicine Journal and E-health", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/02640414.2018.1491941", "url": "https://doi.org/10.1080/02640414.2018.1491941", "title": "Assessment of step accuracy using the Consumer Technology Association standard.", "journal": "Journal of Sports Sciences", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/02640414.2018.1527199", "url": "https://doi.org/10.1080/02640414.2018.1527199", "title": "Validity of the \"Samsung Health\" application to measure steps: A study with two different samsung smartphones.", "journal": "Journal of Sports Sciences", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.maturitas.2018.03.016", "url": "https://doi.org/10.1016/j.maturitas.2018.03.016", "title": "The validity and reliability of consumer-grade activity trackers in older, community-dwelling adults: A systematic review.", "journal": "Maturitas", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/09593985.2017.1354412", "url": "https://doi.org/10.1080/09593985.2017.1354412", "title": "Step count accuracy and reliability of two activity tracking devices in people after stroke.", "journal": "Physiotherapy Theory and Practice", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.gaitpost.2018.04.034", "url": "https://doi.org/10.1016/j.gaitpost.2018.04.034", "title": "Accuracy of wearable physical activity trackers in people with Parkinson's disease.", "journal": "Gait & Posture", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1249/mss.0000000000001471", "url": "https://doi.org/10.1249/MSS.0000000000001471", "title": "Validity of Wearable Activity Monitors during Cycling and Resistance Exercise.", "journal": "Medicine and Science in Sports and Exercise", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "activity/energy-expenditure-validity", "desk": "activity", "desk_name": "Activity", "statement": "Consumer wearables measure calorie/energy-expenditure accurately enough to be meaningful.", "question": "are consumer wearables accurate enough to trust for calorie/energy-expenditure estimates", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Multiple supporting studies are consistent with the core relationship.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but it does not test this claim’s core relationship directly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "At least one unresolved conflicting study bears on the core claim, capping the rating until reconciled.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-activity#energy-expenditure-validity", "registry_finding": { "id": "KYP-ER-0010", "url": "https://knowyourprime.com/evidence-wearable-calorie-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.1007/s40279-024-02077-2", "url": "https://doi.org/10.1007/s40279-024-02077-2", "title": "Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.", "journal": "Sports Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/30791", "url": "https://doi.org/10.2196/30791", "title": "Accuracy and Acceptability of Wrist-Wearable Activity-Tracking Devices: Systematic Review of the Literature.", "journal": "Journal of Medical Internet Research", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/35626", "url": "https://doi.org/10.2196/35626", "title": "Accuracy and Precision of Energy Expenditure, Heart Rate, and Steps Measured by Combined-Sensing Fitbits Against Reference Measures: Systematic Review and Meta-analysis.", "journal": "JMIR mHealth and uHealth", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/18694", "url": "https://doi.org/10.2196/18694", "title": "Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review.", "journal": "JMIR mHealth and uHealth", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1038/s41393-020-0427-5", "url": "https://doi.org/10.1038/s41393-020-0427-5", "title": "Comparative validity of energy expenditure prediction algorithms using wearable devices for people with spinal cord injury.", "journal": "Spinal Cord", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1080/02701367.2019.1603989", "url": "https://doi.org/10.1080/02701367.2019.1603989", "title": "Validity of Activity Trackers in Estimating Energy Expenditure During High-Intensity Functional Training.", "journal": "Research Quarterly for Exercise and Sport", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0342543", "url": "https://doi.org/10.1371/journal.pone.0342543", "title": "Comparison of consumer-grade wearable devices with a research-grade instrument for measuring physical activity in a free-living setting.", "journal": "PloS One", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/83090", "url": "https://doi.org/10.2196/83090", "title": "Validity of Galaxy Watch for Estimating Energy Expenditure During Intermittent Running: Cross-Sectional Study.", "journal": "JMIR Formative Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/69343", "url": "https://doi.org/10.2196/69343", "title": "Analysis of a Medically Certified, Wrist-Worn Sensor for the Assessment of Heart Rate and Energy Expenditure During Daily Activities in Patients With Chronic Heart Failure or Coronary Artery Disease and Recreational Athletes: Validation Study.", "journal": "JMIR Cardio", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26144486", "url": "https://doi.org/10.3390/s26144486", "title": "Consumer Smartwatch Technology in Health and Performance Research: Validity, Limitations, and Real-World Applications.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25061726", "url": "https://doi.org/10.3390/s25061726", "title": "Comparison of Students' Physical Activity at Different Times and Establishment of a Regression Model for Smart Fitness Trackers.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0331399", "url": "https://doi.org/10.1371/journal.pone.0331399", "title": "Validity of four low-cost smartwatches in estimating energy expenditure during cycling in Chinese untrained women.", "journal": "PloS One", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1249/mss.0000000000003721", "url": "https://doi.org/10.1249/MSS.0000000000003721", "title": "Leveraging Accelerometry and Heart Rate Data from Consumer Wearables to Predict Physical Activity in Children: A Device Agnostic Approach.", "journal": "Medicine and Science in Sports and Exercise", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-025-99963-0", "url": "https://doi.org/10.1038/s41598-025-99963-0", "title": "Developing and comparing a new BMI inclusive energy expenditure algorithm on wrist-worn wearables.", "journal": "Scientific Reports", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/17483107.2024.2405895", "url": "https://doi.org/10.1080/17483107.2024.2405895", "title": "Validity of a wrist-worn consumer-grade wearable for estimating energy expenditure, sedentary behaviour, and physical activity in manual wheelchair users with spinal cord injury.", "journal": "Disability and Rehabilitation. Assistive Technology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/19417381231175149", "url": "https://doi.org/10.1177/19417381231175149", "title": "Exercise Intensity and Activity Energy Expenditure of Professional Golf Players in Official Competitive Setting.", "journal": "Sports Health", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1123/jpah.2022-0160", "url": "https://doi.org/10.1123/jpah.2022-0160", "title": "Wearable Device Validity in Measuring Steps, Energy Expenditure, and Heart Rate Across Age, Gender, and Body Mass Index: Data Analysis From a Systematic Review.", "journal": "Journal of Physical Activity & Health", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/02640414.2020.1746088", "url": "https://doi.org/10.1080/02640414.2020.1746088", "title": "Improving energy expenditure estimates from wearable devices: A machine learning approach.", "journal": "Journal of Sports Sciences", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1249/mss.0000000000001471", "url": "https://doi.org/10.1249/MSS.0000000000001471", "title": "Validity of Wearable Activity Monitors during Cycling and Resistance Exercise.", "journal": "Medicine and Science in Sports and Exercise", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0171720", "url": "https://doi.org/10.1371/journal.pone.0171720", "title": "Assessment of laboratory and daily energy expenditure estimates from consumer multi-sensor physical activity monitors.", "journal": "PloS One", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "activity/max-heart-rate-formula-validity", "desk": "activity", "desk_name": "Activity", "statement": "Age-based formulas such as 220-minus-age accurately predict an individual's true maximal heart rate.", "question": "does 220 minus age (or similar age-based formulas) accurately predict max heart rate", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding runs contrary to this claim, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-activity#max-heart-rate-formula-validity", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.3390/jcm13185562", "url": "https://doi.org/10.3390/jcm13185562", "title": "Target Heart Rate Formulas for Exercise Stress Testing: What Is the Evidence?", "journal": "Journal of Clinical Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3389/fphys.2018.00226", "url": "https://doi.org/10.3389/fphys.2018.00226", "title": "Age-Predicted Maximal Heart Rate in Recreational Marathon Runners: A Cross-Sectional Study on Fox's and Tanaka's Equations", "journal": "Frontiers in Physiology", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "activity/atypical_gait_steps", "desk": "activity", "desk_name": "Activity", "statement": "A wrist tracker undercounts badly when you use a walker or walk slowly. An Apple Watch lost 36% of steps with a rolling walker, and a wrist Fitbit ran 31% error where the same Fitbit on a hip ran 1.5%.", "question": "Does a wrist tracker still count steps right with a cane or walker?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-activity#atypical_gait_steps", "registry_finding": null, "studies": [ { "role": "conflicting", "id": "doi:10.1186/s12984-021-00863-x", "url": "https://doi.org/10.1186/s12984-021-00863-x", "title": "Utilization of wearable technology to assess gait and mobility post-stroke: a systematic review.", "journal": "Journal of Neuroengineering and Rehabilitation", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.gaitpost.2020.05.037", "url": "https://doi.org/10.1016/j.gaitpost.2020.05.037", "title": "Validation of different stepping counters during treadmill and over ground walking.", "journal": "Gait & Posture", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.gaitpost.2018.04.034", "url": "https://doi.org/10.1016/j.gaitpost.2018.04.034", "title": "Accuracy of wearable physical activity trackers in people with Parkinson's disease.", "journal": "Gait & Posture", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.7717/peerj.20690", "url": "https://doi.org/10.7717/peerj.20690", "title": "Why your smartwatch may be misleading your doctor: a cross-sectional study on the impact of mobility aids on wearable accuracy in older adults.", "journal": "PeerJ", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.3390/ijerph22071100", "url": "https://doi.org/10.3390/ijerph22071100", "title": "The Effect of Assistive Devices on the Accuracy of Fitbits in Healthy Individuals: A Brief Report.", "journal": "International Journal of Environmental Research and Public Health", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/10527", "url": "https://doi.org/10.2196/10527", "title": "Accuracy of Fitbit Devices: Systematic Review and Narrative Syntheses of Quantitative Data", "journal": "JMIR Mhealth and Uhealth", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "activity/depression_detection", "desk": "activity", "desk_name": "Activity", "statement": "Wearable data sorted depression severity at an AUC of 0.82 across a student and an outpatient sample. Reviews of the wider literature put the predictive ability lower and call it unready for clinical use.", "question": "Can a fitness tracker detect depression?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its own reported finding supports this claim only weakly, so the evidence is treated as unsettled rather than affirming." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-activity#depression_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1038/s41598-026-47177-3", "url": "https://doi.org/10.1038/s41598-026-47177-3", "title": "Using wearable data to detect depression severity across clinical and non-clinical samples.", "journal": "Scientific Reports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/24872", "url": "https://doi.org/10.2196/24872", "title": "Digital Biomarkers for Depression Screening With Wearable Devices: Cross-sectional Study With Machine Learning Modeling.", "journal": "JMIR mHealth and uHealth", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/57418", "url": "https://doi.org/10.2196/57418", "title": "Use of Mobile Sensing Data for Longitudinal Monitoring and Prediction of Depression Severity: Systematic Review.", "journal": "Journal of Medical Internet Research", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/measurement_validity", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "Consumer wearable pulse oximeters measure blood oxygen saturation (SpO2) accurately enough compared to arterial blood gas reference standards to be meaningful for general consumer use.", "question": "Do consumer wearables measure blood oxygen saturation accurately?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#measurement_validity", "registry_finding": { "id": "KYP-ER-0001", "url": "https://knowyourprime.com/evidence-wearable-blood-oxygen-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.2196/85253", "url": "https://doi.org/10.2196/85253", "title": "Performance of Wearable Pulse Oximetry During Controlled Hypoxia Induction: Instrument Validation Study.", "journal": "JMIR Formative Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1007/s11845-023-03456-w", "url": "https://doi.org/10.1007/s11845-023-03456-w", "title": "Accuracy of the Apple Watch in measuring oxygen saturation: comparison with pulse oximetry and ABG.", "journal": "Irish Journal of Medical Science", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.5664/jcsm.11178", "url": "https://doi.org/10.5664/jcsm.11178", "title": "Performance of a commercial smart watch compared to polysomnography reference for overnight continuous oximetry measurement and sleep apnea evaluation.", "journal": "Journal of Clinical Sleep Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "funding statement: six authors had a Samsung Electronics research grant" ] } }, { "role": "anchor", "id": "doi:10.2196/27503", "url": "https://doi.org/10.2196/27503", "title": "Validation of the Withings ScanWatch as a Wrist-Worn Reflective Pulse Oximeter: Prospective Interventional Clinical Study.", "journal": "Journal of Medical Internet Research", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [ "Withings" ], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s23229164", "url": "https://doi.org/10.3390/s23229164", "title": "Evaluation of Leading Smartwatches for the Detection of Hypoxemia: Comparison to Reference Oximeter.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1016/j.sleh.2022.04.003", "url": "https://doi.org/10.1016/j.sleh.2022.04.003", "title": "Performance evaluation of a wrist-worn reflectance pulse oximeter during sleep.", "journal": "Sleep Health", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [ "Samsung Electronics" ], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.3390/s25010275", "url": "https://doi.org/10.3390/s25010275", "title": "Validation of Aerobic Capacity (VO2max) and Pulse Oximetry in Wearable Technology.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.mcpdig.2024.02.001", "url": "https://doi.org/10.1016/j.mcpdig.2024.02.001", "title": "Accuracy of Smartwatch Pulse Oximetry Measurements in Hospitalized Patients With Coronavirus Disease 2019", "journal": "Mayo Clinic Proceedings Digital Health", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1055/a-1337-2790", "url": "https://doi.org/10.1055/a-1337-2790", "title": "Accuracy and Reliability of Pulse O2 Saturation Measured by a Wrist-worn Oximeter.", "journal": "International Journal of Sports Medicine", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.4187/respcare.07670", "url": "https://doi.org/10.4187/respcare.07670", "title": "Reliability of Smartphone Pulse Oximetry in Subjects at Risk for Hypoxemia.", "journal": "Respiratory Care", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/81955", "url": "https://doi.org/10.2196/81955", "title": "Reliability and Safety of Smartwatch Blood Pressure and Oxygen Saturation Measurements in Older Adults: Instrument Validation Study.", "journal": "JMIR Formative Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10439-025-03936-3", "url": "https://doi.org/10.1007/s10439-025-03936-3", "title": "An Adjustable Smart Ring to Monitor Pulse Rate and Peripheral Blood Oxygen Saturation.", "journal": "Annals of Biomedical Engineering", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10877-024-01229-z", "url": "https://doi.org/10.1007/s10877-024-01229-z", "title": "Clinical evaluation of a smart wristband for monitoring oxygen saturation, pulse rate, and respiratory rate.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25051286", "url": "https://doi.org/10.3390/s25051286", "title": "Evaluation of Pulse Oximetry Accuracy in a Commercial Smartphone and Smartwatch Device During Human Hypoxia Laboratory Testing.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc58623.2025.11252834", "url": "https://doi.org/10.1109/EMBC58623.2025.11252834", "title": "Continuous SpO 2 Monitoring Using Reflectance Pulse Oximetry at the Wrist and Upper Arm During Overnight Sleep Apnea Recordings.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1249/mss.0000000000003460", "url": "https://doi.org/10.1249/MSS.0000000000003460", "title": "Validation of Polar Elixir™ Pulse Oximeter against Arterial Blood Gases during Stepwise Steady-State Inspired Hypoxia.", "journal": "Medicine and Science in Sports and Exercise", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [ "Polar Electro" ], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4187/respcare.11258", "url": "https://doi.org/10.4187/respcare.11258", "title": "The Accuracy of Readily Available Consumer-Grade Oxygen Saturation Monitors in Pediatric Patients.", "journal": "Respiratory Care", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pdig.0000296", "url": "https://doi.org/10.1371/journal.pdig.0000296", "title": "Investigating the accuracy of blood oxygen saturation measurements in common consumer smartwatches", "journal": "PLOS Digital Health", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.7759/cureus.35355", "url": "https://doi.org/10.7759/cureus.35355", "title": "Accuracy of the Apple Watch Oxygen Saturation Measurement in Adults: A Systematic Review", "journal": "Cureus", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4187/respcare.09795", "url": "https://doi.org/10.4187/respcare.09795", "title": "Pulse Oximeter Performance, Racial Inequity, and the Work Ahead.", "journal": "Respiratory Care", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/02701367.2020.1759768", "url": "https://doi.org/10.1080/02701367.2020.1759768", "title": "Accuracy and Reliability of Commercial Wrist-Worn Pulse Oximeter During Normobaric Hypoxia Exposure Under Resting Conditions.", "journal": "Research Quarterly for Exercise and Sport", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1186/s12890-019-1007-3", "url": "https://doi.org/10.1186/s12890-019-1007-3", "title": "A multicentre prospective observational study comparing arterial blood gas values to those obtained by pulse oximeters used in adult patients attending Australian and New Zealand hospitals.", "journal": "BMC Pulmonary Medicine", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/aln.0000000000002002", "url": "https://doi.org/10.1097/ALN.0000000000002002", "title": "Four Types of Pulse Oximeters Accurately Detect Hypoxia during Low Perfusion and Motion.", "journal": "Anesthesiology", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1213/ane.0000000000001300", "url": "https://doi.org/10.1213/ANE.0000000000001300", "title": "The Accuracy of 6 Inexpensive Pulse Oximeters Not Cleared by the Food and Drug Administration: The Possible Global Public Health Implications.", "journal": "Anesthesia and Analgesia", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/00000539-200210000-00033", "url": "https://doi.org/10.1097/00000539-200210000-00033", "title": "\"Motion-resistant\" pulse oximetry: a comparison of new and old models.", "journal": "Anesthesia and Analgesia", "year": 2002, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/s0147-9563(98)90086-3", "url": "https://doi.org/10.1016/s0147-9563(98)90086-3", "title": "Meta-analysis of arterial oxygen saturation monitoring by pulse oximetry in adults.", "journal": "Heart & Lung", "year": 1999, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/s0735-6757(99)90019-0", "url": "https://doi.org/10.1016/s0735-6757(99)90019-0", "title": "Pulse oximetry: principles and limitations.", "journal": "The American Journal of Emergency Medicine", "year": 1999, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "pmid:8914569", "url": "https://pubmed.ncbi.nlm.nih.gov/8914569/", "title": "Accuracy of pulse oximetry in pigmented patients.", "journal": "South African Medical Journal", "year": 1997, "industry_ties": { "checked": false } }, { "role": "supporting", "id": "doi:10.1111/j.1365-2044.1991.tb09410.x", "url": "https://doi.org/10.1111/j.1365-2044.1991.tb09410.x", "title": "Potential errors in pulse oximetry. I. Pulse oximeter evaluation.", "journal": "Anaesthesia", "year": 1991, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/skin_pigmentation_bias", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "Pulse oximeter accuracy (including in consumer wearables) is systematically reduced for individuals with darker skin pigmentation, most often via overestimation of true oxygen saturation.", "question": "Does skin pigmentation affect pulse oximeter accuracy?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#skin_pigmentation_bias", "registry_finding": { "id": "KYP-ER-0002", "url": "https://knowyourprime.com/evidence-pulse-oximeter-skin-tone-bias" }, "studies": [ { "role": "anchor", "id": "doi:10.1136/bmj-2025-085535", "url": "https://doi.org/10.1136/bmj-2025-085535", "title": "The impact of skin tone on performance of pulse oximeters used by NHS England COVID Oximetry @home scheme: measurement and diagnostic accuracy study.", "journal": "BMJ", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1177/10547738251374746", "url": "https://doi.org/10.1177/10547738251374746", "title": "Do Differences in Skin Pigmentation Affect Detection of Hypoxemia by Pulse Oximetry: A Systematic Review of the Literature.", "journal": "Clinical Nursing Research", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.2196/62769", "url": "https://doi.org/10.2196/62769", "title": "Impact of Skin Pigmentation on Pulse Oximetry Blood Oxygenation and Wearable Pulse Rate Accuracy: Systematic Review and Meta-Analysis.", "journal": "Journal of Medical Internet Research", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [ "Verily Life Sciences" ], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1213/ane.0000000000006755", "url": "https://doi.org/10.1213/ANE.0000000000006755", "title": "Low Perfusion and Missed Diagnosis of Hypoxemia by Pulse Oximetry in Darkly Pigmented Skin: A Prospective Study.", "journal": "Anesthesia and Analgesia", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1097/00000542-200504000-00004", "url": "https://doi.org/10.1097/00000542-200504000-00004", "title": "Effects of skin pigmentation on pulse oximeter accuracy at low saturation.", "journal": "Anesthesiology", "year": 2005, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/j.1553-2712.1998.tb02772.x", "url": "https://doi.org/10.1111/j.1553-2712.1998.tb02772.x", "title": "Effect of skin pigmentation on pulse oximetry accuracy in the emergency department.", "journal": "Academic Emergency Medicine", "year": 1998, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "pmid:8914569", "url": "https://pubmed.ncbi.nlm.nih.gov/8914569/", "title": "Accuracy of pulse oximetry in pigmented patients.", "journal": "South African Medical Journal", "year": 1997, "industry_ties": { "checked": false } }, { "role": "conflicting", "id": "doi:10.1111/nicc.70433", "url": "https://doi.org/10.1111/nicc.70433", "title": "Accuracy and Bias of Pulse Oximetry in the Intensive Care Unit: A Prospective Observational Study.", "journal": "Nursing in Critical Care", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "null_result", "id": "doi:10.3390/s24113301", "url": "https://doi.org/10.3390/s24113301", "title": "Effect of Skin Pigmentation and Finger Choice on Accuracy of Oxygen Saturation Measurement in an IoT-Based Pulse Oximeter.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1117/1.jbo.31.7.070501", "url": "https://doi.org/10.1117/1.JBO.31.7.070501", "title": "Broad-linewidth sources result in a skin-tone bias in noninvasive optical measurement of oxygen saturation.", "journal": "Journal of Biomedical Optics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1542/hpeds.2025-008471", "url": "https://doi.org/10.1542/hpeds.2025-008471", "title": "Pilot Study: Using Reflectance as a Proxy for Skin Pigmentation to Assess Pulse Oximeter Accuracy.", "journal": "Hospital Pediatrics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25020559", "url": "https://doi.org/10.3390/s25020559", "title": "Monte Carlo Simulation of the Effect of Melanin Concentration on Light-Tissue Interactions in Reflectance Pulse Oximetry.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11517-024-03091-2", "url": "https://doi.org/10.1007/s11517-024-03091-2", "title": "Pulse oximeter bench tests under different simulated skin tones.", "journal": "Medical & Biological Engineering & Computing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1117/1.jbo.29.s3.s33305", "url": "https://doi.org/10.1117/1.JBO.29.S3.S33305", "title": "Monte Carlo simulation of the effect of melanin concentration on light-tissue interactions for transmittance pulse oximetry measurement.", "journal": "Journal of Biomedical Optics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.rceng.2024.04.005", "url": "https://doi.org/10.1016/j.rceng.2024.04.005", "title": "Determining factors of pulse oximetry accuracy: a literature review.", "journal": "Revista Clinica Espanola", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1117/1.jbo.29.s3.s33308", "url": "https://doi.org/10.1117/1.JBO.29.S3.S33308", "title": "Exploring the bias: how skin color influences oxygen saturation readings via Monte Carlo simulations.", "journal": "Journal of Biomedical Optics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1117/1.jbo.29.s3.s33311", "url": "https://doi.org/10.1117/1.JBO.29.S3.S33311", "title": "Dual-ratio approach to pulse oximetry and the effect of skin tone.", "journal": "Journal of Biomedical Optics", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4187/respcare.12023", "url": "https://doi.org/10.4187/respcare.12023", "title": "Pulse Oximetry: 2023 Year in Review.", "journal": "Respiratory Care", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4187/respcare.09795", "url": "https://doi.org/10.4187/respcare.09795", "title": "Pulse Oximeter Performance, Racial Inequity, and the Work Ahead.", "journal": "Respiratory Care", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1513/annalsats.202203-270cme", "url": "https://doi.org/10.1513/AnnalsATS.202203-270CME", "title": "Racial Disparity in Oxygen Saturation Measurements by Pulse Oximetry: Evidence and Implications.", "journal": "Annals of the American Thoracic Society", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/aln.0000000000004153", "url": "https://doi.org/10.1097/ALN.0000000000004153", "title": "Self-reported Race/Ethnicity and Intraoperative Occult Hypoxemia: A Retrospective Cohort Study.", "journal": "Anesthesiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.4187/respcare.09769", "url": "https://doi.org/10.4187/respcare.09769", "title": "Racial Disparities in Occult Hypoxemia and Clinically Based Mitigation Strategies to Apply in Advance of Technological Advancements.", "journal": "Respiratory Care", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/j.1365-2044.1991.tb09410.x", "url": "https://doi.org/10.1111/j.1365-2044.1991.tb09410.x", "title": "Potential errors in pulse oximetry. I. Pulse oximeter evaluation.", "journal": "Anaesthesia", "year": 1991, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/apnea_screening", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "Oximetry rarely misses sleep apnea and often flags it when it is not there. Sensitivity runs 93 to 97 percent against a sleep lab, specificity 63 percent.", "question": "Can a blood oxygen sensor rule out sleep apnea?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#apnea_screening", "registry_finding": { "id": "KYP-ER-0017", "url": "https://knowyourprime.com/evidence-oximetry-sleep-apnea-screening" }, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.smrv.2025.102139", "url": "https://doi.org/10.1016/j.smrv.2025.102139", "title": "Oximetry-based devices in diagnosis of obstructive sleep apnea: A systematic review and meta-analysis.", "journal": "Sleep Medicine Reviews", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1177/13872877241299458", "url": "https://doi.org/10.1177/13872877241299458", "title": "Screening for obstructive sleep apnea in the memory clinic: A comparison of questionnaires, pulse oximetry, and polysomnography.", "journal": "Journal of Alzheimer's Disease", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.5664/jcsm.3530", "url": "https://doi.org/10.5664/jcsm.3530", "title": "Diagnosis of obstructive sleep apnea using pulse oximeter derived photoplethysmographic signals.", "journal": "Journal of Clinical Sleep Medicine", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1007/s10877-011-9321-1", "url": "https://doi.org/10.1007/s10877-011-9321-1", "title": "Pulse oximetry saturation patterns detect repetitive reductions in airflow.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1088/0967-3334/31/7/001", "url": "https://doi.org/10.1088/0967-3334/31/7/001", "title": "Comparability of pulse oximeters used in sleep medicine for the screening of OSA.", "journal": "Physiological Measurement", "year": 2010, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1539/joh.49.1", "url": "https://doi.org/10.1539/joh.49.1", "title": "The usefulness of sleep apnea syndrome screening using a portable pulse oximeter in the workplace.", "journal": "Journal of Occupational Health", "year": 2007, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1378/chest.127.1.80", "url": "https://doi.org/10.1378/chest.127.1.80", "title": "Choice of oximeter affects apnea-hypopnea index.", "journal": "Chest", "year": 2005, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/jsr.70093", "url": "https://doi.org/10.1111/jsr.70093", "title": "Clinical Validation of Artificial Intelligence Algorithms for the Diagnosis of Adult Obstructive Sleep Apnea and Sleep Staging From Oximetry and Photoplethysmography-SleepAI.", "journal": "Journal of Sleep Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "disclosure: four authors hold shares in SleepAI Ltd, whose algorithms it tests" ] } }, { "role": "supporting", "id": "doi:10.1513/annalsats.202005-510oc", "url": "https://doi.org/10.1513/AnnalsATS.202005-510OC", "title": "Automated Apnea-Hypopnea Index from Oximetry and Spectral Analysis of Cardiopulmonary Coupling.", "journal": "Annals of the American Thoracic Society", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.sleep.2019.12.021", "url": "https://doi.org/10.1016/j.sleep.2019.12.021", "title": "Portable diagnosis of sleep apnea with the validation of individual event detection.", "journal": "Sleep Medicine", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11325-015-1251-6", "url": "https://doi.org/10.1007/s11325-015-1251-6", "title": "High-resolution wrist-worn overnight oximetry has high positive predictive value for obstructive sleep apnea in a sleep study referral population.", "journal": "Sleep & Breathing", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1097/md.0000000000006755", "url": "https://doi.org/10.1097/MD.0000000000006755", "title": "Evaluation of pulse oximeter derived photoplethysmographic signals for obstructive sleep apnea diagnosis.", "journal": "Medicine", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11325-013-0812-9", "url": "https://doi.org/10.1007/s11325-013-0812-9", "title": "Sleep disordered breathing analysis in a general population using standard pulse oximeter signals.", "journal": "Sleep & Breathing", "year": 2014, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/thoraxjnl-2012-201684", "url": "https://doi.org/10.1136/thoraxjnl-2012-201684", "title": "Utility of overnight pulse oximetry and heart rate variability analysis to screen for sleep-disordered breathing in chronic heart failure.", "journal": "Thorax", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.5664/jcsm.2148", "url": "https://doi.org/10.5664/jcsm.2148", "title": "Detection of sleep disordered breathing and its central/obstructive character using nasal cannula and finger pulse oximeter.", "journal": "Journal of Clinical Sleep Medicine", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1213/ane.0b013e318248f4f5", "url": "https://doi.org/10.1213/ANE.0b013e318248f4f5", "title": "Oxygen desaturation index from nocturnal oximetry: a sensitive and specific tool to detect sleep-disordered breathing in surgical patients.", "journal": "Anesthesia and Analgesia", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1258/jtt.2010.100205", "url": "https://doi.org/10.1258/jtt.2010.100205", "title": "Sensitivity and specificity of telemedicine-based long-term pulse-oximetry in comparison with cardiorespiratory polygraphy and polysomnography in patients with obstructive sleep apnoea syndrome.", "journal": "Journal of Telemedicine and Telecare", "year": 2011, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/poor_perfusion", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "Pulse oximeters cope with poor circulation on its own. Combined with darker skin they miss hypoxemia far more often: 21 percent of the time in dark skin against 1 percent in light.", "question": "Does poor circulation make a blood oxygen reading unreliable?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#poor_perfusion", "registry_finding": { "id": "KYP-ER-0019", "url": "https://knowyourprime.com/evidence-blood-oxygen-poor-circulation" }, "studies": [ { "role": "anchor", "id": "doi:10.1007/s10877-021-00797-8", "url": "https://doi.org/10.1007/s10877-021-00797-8", "title": "Accuracy of pulse oximeters in measuring oxygen saturation in patients with poor peripheral perfusion: a systematic review.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "a ResMed-endowed research chair" ], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1213/ane.0000000000006755", "url": "https://doi.org/10.1213/ANE.0000000000006755", "title": "Low Perfusion and Missed Diagnosis of Hypoxemia by Pulse Oximetry in Darkly Pigmented Skin: A Prospective Study.", "journal": "Anesthesia and Analgesia", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/s0735-6757(99)90019-0", "url": "https://doi.org/10.1016/s0735-6757(99)90019-0", "title": "Pulse oximetry: principles and limitations.", "journal": "The American Journal of Emergency Medicine", "year": 1999, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "pmid:9740887", "url": "https://pubmed.ncbi.nlm.nih.gov/9740887/", "title": "Clinical evaluation of noninvasive monitoring of oxygen saturation in critically ill patients.", "journal": "American Journal of Critical Care", "year": 1998, "industry_ties": { "checked": false } }, { "role": "supporting", "id": "doi:10.1016/j.rceng.2024.04.005", "url": "https://doi.org/10.1016/j.rceng.2024.04.005", "title": "Determining factors of pulse oximetry accuracy: a literature review.", "journal": "Revista Clinica Espanola", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s001340101064", "url": "https://doi.org/10.1007/s001340101064", "title": "Accuracy of pulse oximetry in the intensive care unit.", "journal": "Intensive Care Medicine", "year": 2002, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/j.1365-2044.1988.tb09025.x", "url": "https://doi.org/10.1111/j.1365-2044.1988.tb09025.x", "title": "Pulse oximetry and postoperative hypothermia. An evaluation of the Nellcor N-100 in a cardiac surgical intensive care unit.", "journal": "Anaesthesia", "year": 1988, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/altitude_accuracy", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "At simulated altitude while resting, a wrist oximeter overestimates blood oxygen only slightly until about 12,000 ft, where it breaks down. Tested at real altitude up to 4,800 m it failed outright, and the authors concluded its use for altitude acclimatization should be proscribed, because an overestimated reading can push a trekker to keep climbing while already at risk.", "question": "Can you trust your watch's blood oxygen reading at altitude?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#altitude_accuracy", "registry_finding": { "id": "KYP-ER-0018", "url": "https://knowyourprime.com/evidence-smartwatch-blood-oxygen-at-altitude" }, "studies": [ { "role": "anchor", "id": "doi:10.1080/02701367.2020.1759768", "url": "https://doi.org/10.1080/02701367.2020.1759768", "title": "Accuracy and Reliability of Commercial Wrist-Worn Pulse Oximeter During Normobaric Hypoxia Exposure Under Resting Conditions.", "journal": "Research Quarterly for Exercise and Sport", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s21196363", "url": "https://doi.org/10.3390/s21196363", "title": "Validity of Peripheral Oxygen Saturation Measurements with the Garmin Fēnix® 5X Plus Wearable Device at 4559 m", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1055/a-1337-2790", "url": "https://doi.org/10.1055/a-1337-2790", "title": "Accuracy and Reliability of Pulse O2 Saturation Measured by a Wrist-worn Oximeter.", "journal": "International Journal of Sports Medicine", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/15578682251398399", "url": "https://doi.org/10.1177/15578682251398399", "title": "Association Between Decreased Pulse Oximetry and Acute Mountain Sickness Upon Rapid Ascent to 4,086 m Among Young Chinese Men.", "journal": "High Altitude Medicine & Biology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.wem.2012.11.009", "url": "https://doi.org/10.1016/j.wem.2012.11.009", "title": "Measuring arterial oxygenation in a high altitude field environment: comparing portable pulse oximetry with blood gas analysis.", "journal": "Wilderness & Environmental Medicine", "year": 2013, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1152/japplphysiol.00409.2001", "url": "https://doi.org/10.1152/japplphysiol.00409.2001", "title": "Validity of pulse oximetry during maximal exercise in normoxia, hypoxia, and hyperoxia.", "journal": "Journal of Applied Physiology (Bethesda, Md", "year": 2002, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "spo2/apple_watch_validity", "desk": "spo2", "desk_name": "Blood oxygen", "statement": "Apple Watch blood oxygen readings agree with arterial blood and medical pulse oximeters at normal and moderately low oxygen levels, with low average bias, but individual readings can be several points off and accuracy falls once saturation drops below about 88 percent.", "question": "How accurate is the Apple Watch blood oxygen sensor compared with medical devices?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute." ] }, "evidence_last_evaluated": "2026-10-25", "url": "https://knowyourprime.com/research-desk-spo2#apple_watch_validity", "registry_finding": { "id": "KYP-ER-0023", "url": "https://knowyourprime.com/evidence-apple-watch-blood-oxygen-accuracy" }, "studies": [ { "role": "anchor", "id": "doi:10.1038/s41746-025-02238-1", "url": "https://doi.org/10.1038/s41746-025-02238-1", "title": "The accuracy of Apple Watch measurements: a living systematic review and meta-analysis", "journal": "Npj Digital Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1007/s11845-023-03456-w", "url": "https://doi.org/10.1007/s11845-023-03456-w", "title": "Accuracy of the Apple Watch in measuring oxygen saturation: comparison with pulse oximetry and ABG.", "journal": "Irish Journal of Medical Science", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.7759/cureus.35355", "url": "https://doi.org/10.7759/cureus.35355", "title": "Accuracy of the Apple Watch Oxygen Saturation Measurement in Adults: A Systematic Review", "journal": "Cureus", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.2196/85253", "url": "https://doi.org/10.2196/85253", "title": "Performance of Wearable Pulse Oximetry During Controlled Hypoxia Induction: Instrument Validation Study.", "journal": "JMIR Formative Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.mcpdig.2024.02.001", "url": "https://doi.org/10.1016/j.mcpdig.2024.02.001", "title": "Accuracy of Smartwatch Pulse Oximetry Measurements in Hospitalized Patients With Coronavirus Disease 2019", "journal": "Mayo Clinic Proceedings Digital Health", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23229164", "url": "https://doi.org/10.3390/s23229164", "title": "Evaluation of Leading Smartwatches for the Detection of Hypoxemia: Comparison to Reference Oximeter.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pdig.0000296", "url": "https://doi.org/10.1371/journal.pdig.0000296", "title": "Investigating the accuracy of blood oxygen saturation measurements in common consumer smartwatches", "journal": "PLOS Digital Health", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "respiratory_rate/measurement_validity", "desk": "respiratory_rate", "desk_name": "Respiratory rate", "statement": "Wearable breathing-rate sensors agree closely with clinical reference methods at rest. Contactless camera measurement is rated separately and is not settled.", "question": "Do wearables measure respiratory rate accurately?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Systematic-review or meta-analytic evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on secondary points that do not change the core direction." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-respiratory-rate#measurement_validity", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1177/14799731231198865", "url": "https://doi.org/10.1177/14799731231198865", "title": "Clinical validation of a wearable respiratory rate device: A brief report.", "journal": "Chronic Respiratory Disease", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [ "Biobeat" ], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/anae.15834", "url": "https://doi.org/10.1111/anae.15834", "title": "Novel wearable and contactless heart rate, respiratory rate, and oxygen saturation monitoring devices: a systematic review and meta-analysis.", "journal": "Anaesthesia", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1007/s10877-025-01380-1", "url": "https://doi.org/10.1007/s10877-025-01380-1", "title": "Comparison of manual and automated respiratory rate measurements on hospital wards: a prospective observational study.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1097/pec.0000000000003400", "url": "https://doi.org/10.1097/PEC.0000000000003400", "title": "Can Caregivers Reliably Assess Their Child's Heart Rate and Respiration Rate Using Smartphone or Smartwatch Applications?", "journal": "Pediatric Emergency Care", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.23736/s0022-4707.18.08689-9", "url": "https://doi.org/10.23736/S0022-4707.18.08689-9", "title": "The use of a smart-textile garment during high-intensity functional training: a pilot study.", "journal": "The Journal of Sports Medicine and Physical Fitness", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23187976", "url": "https://doi.org/10.3390/s23187976", "title": "Validating a Consumer Smartwatch for Nocturnal Respiratory Rate Measurements in Sleep Monitoring.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [ "Samsung Electronics" ], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10877-026-01419-x", "url": "https://doi.org/10.1007/s10877-026-01419-x", "title": "Clinical validation of a novel accelerometer-based respiratory rate monitor.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1088/2057-1976/ae5710", "url": "https://doi.org/10.1088/2057-1976/ae5710", "title": "Bluetooth low energy thermohygrometric sensor for continuous respiratory rate monitoring: 48 h breathing simulator and human proof-of-concept.", "journal": "Biomedical Physics & Engineering Express", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26051506", "url": "https://doi.org/10.3390/s26051506", "title": "Seconds Matter: Rapid Non-Contact Monitoring of Heart and Respiratory Rate from Face Videos.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10877-024-01229-z", "url": "https://doi.org/10.1007/s10877-024-01229-z", "title": "Clinical evaluation of a smart wristband for monitoring oxygen saturation, pulse rate, and respiratory rate.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25041094", "url": "https://doi.org/10.3390/s25041094", "title": "Accuracy of the Instantaneous Breathing and Heart Rates Estimated by Smartphone Inertial Units.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25010127", "url": "https://doi.org/10.3390/s25010127", "title": "Accuracy of Rhythm Diagnostic Systems' MultiSense ® in Detection of Arterial Oxygen Saturation and Respiratory Rate During Hypoxia in Humans: Effects of Skin Color and Device Localization.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1088/1361-6579/adfc24", "url": "https://doi.org/10.1088/1361-6579/adfc24", "title": "A systematic review of contactless respiratory rate measurement using RGB cameras.", "journal": "Physiological Measurement", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25165136", "url": "https://doi.org/10.3390/s25165136", "title": "Comparison of Techniques for Respiratory Rate Extraction from Electrocardiogram and Photoplethysmogram.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1371/journal.pone.0325307", "url": "https://doi.org/10.1371/journal.pone.0325307", "title": "Continuous respiratory rate monitoring through temporal fusion of ECG and PPG signals.", "journal": "PloS One", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s13246-025-01582-6", "url": "https://doi.org/10.1007/s13246-025-01582-6", "title": "Toward accurate estimation of respiratory rate from the photoplethysmogram: effect of different window period of PPG signals.", "journal": "Physical and 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"url": "https://doi.org/10.2196/56547", "title": "Feasibility of Monitoring Heart and Respiratory Rates Using Nonwearable Devices and Consistency of the Measured Parameters: Pilot Feasibility Study.", "journal": "JMIR Human Factors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s24123766", "url": "https://doi.org/10.3390/s24123766", "title": "A Guide to Measuring Heart and Respiratory Rates Based on Off-the-Shelf Photoplethysmographic Hardware and Open-Source Software.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/bios14120631", "url": "https://doi.org/10.3390/bios14120631", "title": "Evaluation of Photoplethysmography-Based Monitoring of Respiration Rate During High-Intensity Interval Training: Implications for Healthcare Monitoring.", 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"author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: three authors hold shares in the company with rights to sell the sensor tested" ] } }, { "role": "supporting", "id": "doi:10.1007/s13239-023-00657-3", "url": "https://doi.org/10.1007/s13239-023-00657-3", "title": "An IMU-Based Wearable System for Respiratory Rate Estimation in Static and Dynamic Conditions.", "journal": "Cardiovascular Engineering and Technology", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: e-Novia part-funded the work and owns a patent application naming two authors" ] } }, { "role": "supporting", "id": "doi:10.3390/s23094550", "url": "https://doi.org/10.3390/s23094550", "title": "Contactless Camera-Based Heart Rate and Respiratory Rate Monitoring Using AI on Hardware.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/bios13060637", "url": "https://doi.org/10.3390/bios13060637", "title": "Respiratory Rate Estimation during Walking and Running Using Breathing Sounds Recorded with a Microphone.", "journal": "Biosensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10877-021-00734-9", "url": "https://doi.org/10.1007/s10877-021-00734-9", "title": "Effectiveness of consumer-grade contactless vital signs monitors: a systematic review and meta-analysis.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "a ResMed-endowed research chair" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1088/1361-6579/ac9fa3", "url": "https://doi.org/10.1088/1361-6579/ac9fa3", "title": "Agreement between standard and continuous wireless vital sign measurements after major abdominal surgery: a clinical comparison study.", "journal": "Physiological Measurement", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.rmed.2021.106675", "url": "https://doi.org/10.1016/j.rmed.2021.106675", "title": "Validity of a novel respiratory rate monitor comprising stretchable strain sensors during a 6-min walking test in patients with chronic pulmonary obstructive disease.", "journal": "Respiratory Medicine", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s22176689", "url": "https://doi.org/10.3390/s22176689", "title": "Electrodeless Heart and Respiratory Rate Estimation during Sleep Using a Single Fabric Band and Event-Based Edge Processing.", "journal": "Sensors", "year": 2022, "industry_ties": { "checked": true, 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"journal": "IEEE Transactions on Bio-medical Engineering", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s20247168", "url": "https://doi.org/10.3390/s20247168", "title": "Feasibility of Heart Rate and Respiratory Rate Estimation by Inertial Sensors Embedded in a Virtual Reality Headset.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1519/jsc.0000000000003046", "url": "https://doi.org/10.1519/JSC.0000000000003046", "title": "Reliability of Zephyr BioHarness Respiratory Rate at Rest, During the Modified Canadian Aerobic Fitness Test and Recovery.", "journal": "Journal of Strength and Conditioning Research", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s11517-019-02062-2", "url": "https://doi.org/10.1007/s11517-019-02062-2", "title": "Monitoring respiratory rates with a wearable system using a stretchable strain sensor during moderate exercise.", "journal": "Medical & Biological Engineering & Computing", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1088/1361-6579/ab3be0", "url": "https://doi.org/10.1088/1361-6579/ab3be0", "title": "Finger and forehead PPG signal comparison for respiratory rate estimation.", "journal": "Physiological Measurement", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s20020536", "url": "https://doi.org/10.3390/s20020536", "title": "A Multi-Parametric Wearable System to Monitor Neck Movements and Respiratory Frequency of Computer Workers.", "journal": "Sensors", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2018.2867727", "url": "https://doi.org/10.1109/JBHI.2018.2867727", "title": "Respiratory Waveform Estimation From Multiple Accelerometers: An Optimal Sensor Number and Placement Analysis.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s18113705", "url": "https://doi.org/10.3390/s18113705", "title": "Validation of Instantaneous Respiratory Rate Using Reflectance PPG from Different Body Positions.", "journal": "Sensors", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s19040908", "url": "https://doi.org/10.3390/s19040908", "title": "Contact-Based Methods for Measuring Respiratory Rate.", "journal": "Sensors", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/tbme.2017.2720463", "url": "https://doi.org/10.1109/TBME.2017.2720463", "title": "In-Ear Audio Wearable: Measurement of Heart and Breathing Rates for Health and Safety Monitoring.", "journal": "IEEE Transactions on Bio-medical Engineering", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/rbme.2017.2763681", "url": "https://doi.org/10.1109/RBME.2017.2763681", "title": "Breathing Rate Estimation From the Electrocardiogram and Photoplethysmogram: A Review.", "journal": "IEEE Reviews in Biomedical Engineering", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": 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"industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3109/03091902.2011.638965", "url": "https://doi.org/10.3109/03091902.2011.638965", "title": "Photoplethysmographic derivation of respiratory rate: a review of relevant physiology.", "journal": "Journal of Medical Engineering & Technology", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/titb.2009.2037614", "url": "https://doi.org/10.1109/TITB.2009.2037614", "title": "Comparative evaluation of susceptibility to motion artifact in different wearable systems for monitoring respiratory rate.", "journal": "IEEE Transactions on Information Technology in Biomedicine", "year": 2010, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "respiratory_rate/deterioration_detection", "desk": "respiratory_rate", "desk_name": "Respiratory rate", "statement": "Continuous wearable monitoring did not catch deterioration earlier in hospital. It missed all four ICU admissions, and two intensive-care physicians reading the same sensor data agreed 10 percent of the time.", "question": "Can a wearable warn that someone is deteriorating?", "rating": { "label": "Unsupported", "code": "unsupported", "definition": "Existing evidence does not support the claim.", "rule_reasons": [ "Null-result evidence bears directly on the claimed effect." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-respiratory-rate#deterioration_detection", "registry_finding": null, "studies": [ { "role": "null_result", "id": "doi:10.1007/s10916-022-01898-w", "url": "https://doi.org/10.1007/s10916-022-01898-w", "title": "Detecting Patient Deterioration Early Using Continuous Heart rate and Respiratory rate Measurements in Hospitalized COVID-19 Patients.", "journal": "Journal of Medical Systems", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "respiratory_rate/contactless_rr", "desk": "respiratory_rate", "desk_name": "Respiratory rate", "statement": "Contactless cameras read heart rate well. 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A Serious-Game-Based Pilot Study.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. 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"International Journal of Neural Systems", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2019.2893222", "url": "https://doi.org/10.1109/JBHI.2019.2893222", "title": "Electrodermal Activity Based Pre-surgery Stress Detection Using a Wrist Wearable.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/0018720818781196", "url": "https://doi.org/10.1177/0018720818781196", "title": "Human Performance Deterioration Due to Prolonged Wakefulness Can Be Accurately Detected Using Time-Varying Spectral Analysis of Electrodermal Activity.", "journal": "Human Factors", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1523/jneurosci.3672-15.2016", "url": "https://doi.org/10.1523/JNEUROSCI.3672-15.2016", "title": "Multivariate Brain Prediction of Heart Rate and Skin Conductance Responses to Social Threat.", "journal": "The Journal of Neuroscience", "year": 2017, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/0002-8703(94)90748-x", "url": "https://doi.org/10.1016/0002-8703(94)90748-x", "title": "Use of skin conductance changes during mental stress testing as an index of autonomic arousal in cardiovascular research.", "journal": "American Heart Journal", "year": 1994, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "stress_eda/measurement_validity", "desk": "stress_eda", "desk_name": "Stress", "statement": "Consumer wearable EDA sensors measure electrodermal activity accurately enough for meaningful stress-related interpretation.", "question": "Do consumer wearables measure EDA accurately enough to be meaningful?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Multiple supporting studies are consistent with the core relationship.", "An anchor study was assessed but it does not test this claim’s core relationship directly, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its finding is dominated by device or method variance, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its finding is dominated by device or method variance, so the evidence is treated as unsettled rather than affirming.", "An anchor study was assessed but its finding is dominated by device or method variance, so the evidence is treated as unsettled rather than affirming.", "At least one unresolved conflicting study bears on the core claim, capping the rating until reconciled." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-stress#measurement_validity", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1088/1361-6579/ae7bae", "url": "https://doi.org/10.1088/1361-6579/ae7bae", "title": "Electrodermal activity measurements: a review of artifacts.", "journal": "Physiological Measurement", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/psyp.70116", "url": "https://doi.org/10.1111/psyp.70116", "title": "Validation of the Fitbit Charge 5 for the Detection of Heart Rate and Electrodermal Activity.", "journal": "Psychophysiology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1088/1361-6579/ac5007", "url": "https://doi.org/10.1088/1361-6579/ac5007", "title": "Current trends and opportunities in the methodology of electrodermal activity measurement.", "journal": "Physiological Measurement", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/j.1469-8986.2012.01384.x", "url": "https://doi.org/10.1111/j.1469-8986.2012.01384.x", "title": "Publication recommendations for electrodermal measurements.", "journal": "Psychophysiology", "year": 2012, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1111/psyp.13441", "url": "https://doi.org/10.1111/psyp.13441", "title": "Stressing the accuracy: Wrist-worn wearable sensor validation over different conditions.", "journal": "Psychophysiology", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.biopsycho.2026.109336", "url": "https://doi.org/10.1016/j.biopsycho.2026.109336", "title": "Characterizing individual differences in SCR responsivity: A hybrid mixture and single-trial modeling framework.", "journal": "Biological Psychology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ijpsycho.2026.113321", "url": "https://doi.org/10.1016/j.ijpsycho.2026.113321", "title": "Beyond classical metrics: Generalizability theory across psychophysiological modalities.", "journal": "International Journal of Psychophysiology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.compbiomed.2024.109139", "url": "https://doi.org/10.1016/j.compbiomed.2024.109139", "title": "Automatic motion artifact detection in electrodermal activity signals using 1D U-net architecture.", "journal": "Computers in Biology and Medicine", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ijpsycho.2023.112280", "url": "https://doi.org/10.1016/j.ijpsycho.2023.112280", "title": "Adaptive thresholding increases sensitivity to detect changes in the rate of skin conductance responses to psychologically arousing stimuli in both laboratory and ambulatory settings.", "journal": "International Journal of Psychophysiology", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.cmpb.2023.107859", "url": "https://doi.org/10.1016/j.cmpb.2023.107859", "title": "Simulation of ambulatory electrodermal activity and the handling of low-quality segments.", "journal": "Computer Methods and Programs in Biomedicine", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23020620", "url": "https://doi.org/10.3390/s23020620", "title": "Feasibility of Electrodermal Activity and Photoplethysmography Data Acquisition at the Foot Using a Sock Form Factor.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc46164.2021.9629513", "url": "https://doi.org/10.1109/EMBC46164.2021.9629513", "title": "A Preliminary Study on Automatic Motion Artifact Detection in Electrodermal Activity Data Using Machine Learning.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/psyp.14130", "url": "https://doi.org/10.1111/psyp.14130", "title": "A data multiverse analysis investigating non-model based SCR quantification approaches.", "journal": "Psychophysiology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1073/pnas.2004403117", "url": "https://doi.org/10.1073/pnas.2004403117", "title": "Point process temporal structure characterizes electrodermal activity.", "journal": "Proceedings of the National Academy of Sciences of the United States of America", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc.2015.7318762", "url": "https://doi.org/10.1109/EMBC.2015.7318762", "title": "Automatic identification of artifacts in electrodermal activity data.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2016, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/107385840200800209", "url": "https://doi.org/10.1177/107385840200800209", "title": "Electrodermal responses: what happens in the brain.", "journal": "The Neuroscientist", "year": 2002, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "stress_eda/valence_discrimination", "desk": "stress_eda", "desk_name": "Stress", "statement": "Electrodermal sensors detect arousal well and say nothing about whether it is good or bad. Nothing here tests excitement against anxiety, which is the distinction a stress score implies it can make.", "question": "Can a wearable tell excitement from anxiety?", "rating": { "label": "Insufficient", "code": "insufficient", "definition": "Too little evidence exists to reach a conclusion.", "rule_reasons": [] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-stress#valence_discrimination", "registry_finding": null, "studies": [ { "role": "supporting", "id": "doi:10.1109/jbhi.2019.2893222", "url": "https://doi.org/10.1109/JBHI.2019.2893222", "title": "Electrodermal Activity Based Pre-surgery Stress Detection Using a Wrist Wearable.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s17102324", "url": "https://doi.org/10.3390/s17102324", "title": "Electrodermal Activity Sensor for Classification of Calm/Distress Condition.", "journal": "Sensors", "year": 2018, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "temperature_illness/measurement_validity", "desk": "temperature_illness", "desk_name": "Temperature", "statement": "Wearable skin/peripheral temperature sensors measure temperature-related physiological signals with accuracy sufficient to be meaningful for consumer use cases.", "question": "Do consumer/research wearable temperature sensors agree with gold-standard core or reference temperature measurements?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-temperature#measurement_validity", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1113/ep093856", "url": "https://doi.org/10.1113/EP093856", "title": "Accuracy of next-generation wireless skin temperature sensors during exercise-heat stress.", "journal": "Experimental Physiology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1111/sms.70315", "url": "https://doi.org/10.1111/sms.70315", "title": "Core Temperature Estimation Using Wearable Earbud-Type Thermometer and Machine Learning During Light-Intensity Cycling Under Varying Indoor Ambient Temperatures.", "journal": "Scandinavian Journal of Medicine & Science in Sports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1038/s41598-026-48235-6", "url": "https://doi.org/10.1038/s41598-026-48235-6", "title": "Performance comparison of a wired zero-heat-flux sensor and wireless thermistor patch with esophageal probe for core temperature monitoring.", "journal": "Scientific Reports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.jtherbio.2026.104477", "url": "https://doi.org/10.1016/j.jtherbio.2026.104477", "title": "Performance of a wearable CORE sensor for nocturnal core temperature monitoring during sleep.", "journal": "Journal of Thermal Biology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26030972", "url": "https://doi.org/10.3390/s26030972", "title": "A Comprehensive Review of Non-Invasive Core Body Temperature Measurement Techniques.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/03014460.2026.2705279", "url": "https://doi.org/10.1080/03014460.2026.2705279", "title": "Limited efficacy of low-volume ice slurry ingestion on physiological heat strain in Japanese outdoor workers during summer.", "journal": "Annals of Human Biology", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26103235", "url": "https://doi.org/10.3390/s26103235", "title": "A Wearable System for Remote Wrist Skin Temperature Monitoring to Assess Skin Thermal Response to Extreme Cold: A Case Study.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26102940", "url": "https://doi.org/10.3390/s26102940", "title": "Multimodal Fusion of Environmental and Physiological Data for Real-World Personalised Comfort Modelling.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/19417381251388642", "url": "https://doi.org/10.1177/19417381251388642", "title": "Evaluation of Exertional Sweat Loss Estimates in Wearable Technology.", "journal": "Sports Health", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41598-026-47148-8", "url": "https://doi.org/10.1038/s41598-026-47148-8", "title": "Minimally invasive prediction of blood lactate during incremental exercise via heart rate, core body temperature, and sweat-derived indices.", "journal": "Scientific Reports", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s25227058", "url": "https://doi.org/10.3390/s25227058", "title": "Thermoregulation and Heat Stroke Prevention in Older Adults: Advances in Emerging Technologies and Interventions.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1188/25.cjon.e70-e78", "url": "https://doi.org/10.1188/25.CJON.E70-E78", "title": "Noninvasive Continuous Temperature Monitoring in Oncology and Future Directions.", "journal": "Clinical Journal of Oncology Nursing", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1136/bmjopen-2025-103630", "url": "https://doi.org/10.1136/bmjopen-2025-103630", "title": "Use of continuous temperature data from wearable devices for fever or infection management in acute hospital settings: a scoping review protocol.", "journal": "BMJ Open", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1007/s10877-022-00892-4", "url": "https://doi.org/10.1007/s10877-022-00892-4", "title": "Temperature measurements of a wearable and wireless axillary sensor iThermonitor but not a bladder probe represents the core temperature during laparoscopic rectal surgery.", "journal": "Journal of Clinical Monitoring and Computing", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/jbhi.2021.3124551", "url": "https://doi.org/10.1109/JBHI.2021.3124551", "title": "Wearable Personal Core Body Temperature Measurement Considering Individual Differences and Dynamic Tissue Blood Perfusion.", "journal": "IEEE Journal of Biomedical and Health Informatics", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s21051855", "url": "https://doi.org/10.3390/s21051855", "title": "Smart Patch for Skin Temperature: Preliminary Study to Evaluate Psychometrics and Feasibility.", "journal": "Sensors", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.2196/19210", "url": "https://doi.org/10.2196/19210", "title": "An Innovative Wearable Device For Monitoring Continuous Body Surface Temperature (HEARThermo): Instrument Validation Study.", "journal": "JMIR mHealth and uHealth", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1152/japplphysiol.00353.2017", "url": "https://doi.org/10.1152/japplphysiol.00353.2017", "title": "Wearable physiological monitoring for human thermal-work strain optimization.", "journal": "Journal of Applied Physiology (Bethesda, Md", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "temperature_illness/cycle_illness_detection", "desk": "temperature_illness", "desk_name": "Temperature", "statement": "Wrist and ring skin temperature tracks the shift that marks ovulation, closely enough to be used for fertility awareness. Accuracy depends on the sensor and the site.", "question": "Does wearable temperature detect ovulation?", "rating": { "label": "Established", "code": "established", "definition": "Strong, consistent evidence supports the claim.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "Multiple supporting studies are consistent with the core relationship." ] }, "evidence_last_evaluated": "2026-10-15", "url": "https://knowyourprime.com/research-desk-temperature#cycle_illness_detection", "registry_finding": null, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.bios.2026.118755", "url": "https://doi.org/10.1016/j.bios.2026.118755", "title": "Evaluation of the accuracy of wrist skin temperature measured using an infrared sensor for prediction ovulation date.", "journal": "Biosensors & Bioelectronics", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Samsung" ], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.3390/s25206327", "url": "https://doi.org/10.3390/s25206327", "title": "Accuracy of an Overnight Axillary-Temperature Sensor for Ovulation Detection: Validation in 194 Cycles.", "journal": "Sensors", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: Tempdrop's founder and an employee are authors; Tempdrop makes the armband tested" ] } }, { "role": "anchor", "id": "doi:10.2196/20710", "url": "https://doi.org/10.2196/20710", "title": "The Accuracy of Wrist Skin Temperature in Detecting Ovulation Compared to Basal Body Temperature: Prospective Comparative Diagnostic Accuracy Study.", "journal": "Journal of Medical Internet Research", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "an author is an Ava employee, another a former employee, another an Ava adviser; it tested the Ava bracelet" ] } }, { "role": "anchor", "id": "doi:10.1042/bsr20171279", "url": "https://doi.org/10.1042/BSR20171279", "title": "Modern fertility awareness methods: wrist wearables capture the changes in temperature associated with the menstrual cycle.", "journal": "Bioscience Reports", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/07420528.2025.2587796", "url": "https://doi.org/10.1080/07420528.2025.2587796", "title": "Wrist temperature as a sleep marker in actigraphy.", "journal": "Chronobiology International", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.sleep.2026.109074", "url": "https://doi.org/10.1016/j.sleep.2026.109074", "title": "Distal skin temperature stabilization is tightly coupled with sleep onset across structured and free-living conditions.", "journal": "Sleep Medicine", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: an author sits on Oura's medical advisory board" ] } }, { "role": "supporting", "id": "doi:10.1093/sleep/zsag077", "url": "https://doi.org/10.1093/sleep/zsag077", "title": "Age-related patterns in distal skin temperature during naps.", "journal": "Sleep", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Oura" ], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s26020550", "url": "https://doi.org/10.3390/s26020550", "title": "Physiological Effects of Far-Infrared-Emitting Garments on Sleep, Thermoregulation, and Autonomic Function Assessed Using Wearable Sensors.", "journal": "Sensors", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jad.2025.119643", "url": "https://doi.org/10.1016/j.jad.2025.119643", "title": "State-dependent skin temperature increase during manic episodes of bipolar disorder.", "journal": "Journal of Affective Disorders", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1590/1980-220x-reeusp-2024-0454en", "url": "https://doi.org/10.1590/1980-220X-REEUSP-2024-0454en", "title": "Effectiveness of menstruation and fertility tracking technology in childbearing women: a scoping review.", "journal": "Revista Da Escola De Enfermagem Da U S P", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/embc53108.2024.10782532", "url": "https://doi.org/10.1109/EMBC53108.2024.10782532", "title": "Measuring Skin Temperature as an Indicator for Cognitive Flow Using a Wrist-worn Wearable.", "journal": "Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/07487304241247893", "url": "https://doi.org/10.1177/07487304241247893", "title": "Using Wearable Skin Temperature Data to Advance Tracking and Characterization of the Menstrual Cycle in a Real-World Setting.", "journal": "Journal of Biological Rhythms", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1177/07487304241265018", "url": "https://doi.org/10.1177/07487304241265018", "title": "Menstrual Cycle Variations in Wearable-Detected Finger Temperature and Heart Rate, But Not in Sleep Metrics, in Young and Midlife Individuals.", "journal": "Journal of Biological Rhythms", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1186/s12884-024-06862-9", "url": "https://doi.org/10.1186/s12884-024-06862-9", "title": "Deep learning model using continuous skin temperature data predicts labor onset.", "journal": "BMC Pregnancy and Childbirth", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.dcn.2023.101221", "url": "https://doi.org/10.1016/j.dcn.2023.101221", "title": "Continuous body temperature as a window into adolescent development.", "journal": "Developmental Cognitive Neuroscience", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.jtherbio.2022.103290", "url": "https://doi.org/10.1016/j.jtherbio.2022.103290", "title": "The use of wearable devices for predicting biphasic basal body temperature to estimate the date of ovulation in women.", "journal": "Journal of Thermal Biology", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1111/imj.14748", "url": "https://doi.org/10.1111/imj.14748", "title": "Monitoring skin temperature at the wrist in hospitalised patients may assist in the detection of infection.", "journal": "Internal Medicine Journal", "year": 2021, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1109/tbme.2019.2916823", "url": "https://doi.org/10.1109/TBME.2019.2916823", "title": "Detection and Prediction of Ovulation From Body Temperature Measured by an In-Ear Wearable Thermometer.", "journal": "IEEE Transactions on Bio-medical Engineering", "year": 2020, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "temperature_illness/illness_detection", "desk": "temperature_illness", "desk_name": "Temperature", "statement": "Wrist temperature flagged infection at 80% sensitivity in a hospital pilot, and adding continuous temperature raised a COVID detection algorithm's accuracy by about 5 percent. 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"role": "anchor", "id": "doi:10.1111/jch.70183", "url": "https://doi.org/10.1111/jch.70183", "title": "Accuracy and Reduced Sleep Disruption of a Wearable Smartwatch for Nocturnal Blood Pressure Monitoring: A Validation Study.", "journal": "Journal of Clinical Hypertension", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [ "Huawei" ], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1097/mbp.0000000000000608", "url": "https://doi.org/10.1097/MBP.0000000000000608", "title": "Validation of the watch-type HUAWEI WATCH D oscillometric wrist blood pressure monitor in adult Chinese.", "journal": "Blood Pressure Monitoring", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1016/j.rceng.2026.502523", "url": "https://doi.org/10.1016/j.rceng.2026.502523", "title": "Clinical reliability of a wrist-worn oscillometric ambulatory blood pressure 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[], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41440-025-02410-w", "url": "https://doi.org/10.1038/s41440-025-02410-w", "title": "The quest for accurate wearable blood pressure monitors.", "journal": "Hypertension Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.3390/s23218877", "url": "https://doi.org/10.3390/s23218877", "title": "WATCH-BPM-Comparison of a WATCH-Type Blood Pressure Monitor with a Conventional Ambulatory Blood Pressure Monitor and Auscultatory Sphygmomanometry.", "journal": "Sensors", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] }, { "id": "bp/nighttime_prognosis", "desk": "bp", "desk_name": "Blood pressure", "statement": "Higher blood pressure during sleep, measured by 24-hour ambulatory monitoring, signals higher risk of cardiovascular events.", "question": 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"anchor", "id": "doi:10.1001/jama.2019.9811", "url": "https://doi.org/10.1001/jama.2019.9811", "title": "Association of Office and Ambulatory Blood Pressure With Mortality and Cardiovascular Outcomes.", "journal": "JAMA", "year": 2019, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1097/hjh.0000000000004276", "url": "https://doi.org/10.1097/HJH.0000000000004276", "title": "A 25-year longitudinal study on dipping/nondipping tracking in the general population: the PAMELA study.", "journal": "Journal of Hypertension", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1016/j.ancard.2026.102035", "url": "https://doi.org/10.1016/j.ancard.2026.102035", "title": "[Prognostic value of dipping status in untreated adult hypertensives from the Algerian population].", "journal": "Annales De Cardiologie Et 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"statement": "Cuffless blood pressure devices that are calibrated with your own cuff readings follow real changes in your blood pressure after calibration, rather than staying close to the calibration value.", "question": "Do smartwatch blood pressure readings follow real changes after calibration?", "rating": { "label": "Uncertain", "code": "uncertain", "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.", "rule_reasons": [ "Anchor-grade evidence affirms the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.", "Some evidence conflicts on 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"doi:10.1097/hjh.0000000000003428", "url": "https://doi.org/10.1097/hjh.0000000000003428", "title": "Evaluation of the ability of a commercially available cuffless wearable device to track blood pressure changes", "journal": "Journal of Hypertension", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: Aktiia supplied the devices tested, and two authors have been paid by Aktiia" ] } }, { "role": "conflicting", "id": "doi:10.1161/hypertensionaha.122.20410", "url": "https://doi.org/10.1161/HYPERTENSIONAHA.122.20410", "title": "The Microsoft Research Aurora Project: Important Findings on Cuffless Blood Pressure Measurement.", "journal": "Hypertension (Dallas, Tex", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1038/s41440-023-01215-z", "url": "https://doi.org/10.1038/s41440-023-01215-z", "title": "Feasibility and measurement stability of smartwatch-based cuffless blood pressure monitoring: A real-world prospective observational study.", "journal": "Hypertension Research", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.3389/fcvm.2022.958212", "url": "https://doi.org/10.3389/fcvm.2022.958212", "title": "Smartwatch-Based Blood Pressure Measurement Demonstrates Insufficient Accuracy", "journal": "Frontiers in Cardiovascular Medicine", "year": 2022, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1080/08037051.2026.2707794", "url": "https://doi.org/10.1080/08037051.2026.2707794", "title": "Long-term stability and blood pressure change tracking with a cuffless wearable device in hypertensive patients.", "journal": "Blood Pressure", "year": 2026, "industry_ties": { "checked": true, 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relationship.", "Multiple supporting studies are consistent with the core relationship.", "An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.", "The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.", "A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute." ] }, "evidence_last_evaluated": "2026-10-19", "url": "https://knowyourprime.com/research-desk-blood-pressure#cuffless_nighttime_accuracy", "registry_finding": { "id": "KYP-ER-0021", "url": "https://knowyourprime.com/evidence-cuffless-blood-pressure-at-night" }, "studies": [ { "role": "anchor", "id": "doi:10.1016/j.ajpc.2025.101342", "url": "https://doi.org/10.1016/j.ajpc.2025.101342", "title": "Comparing the accuracy of continuous blood pressure monitoring using wearable cuffless devices with conventional 24-hour ambulatory blood pressure monitoring: A systematic review and meta-analysis", "journal": "American Journal of Preventive Cardiology", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "anchor", "id": "doi:10.1038/s41598-023-33205-z", "url": "https://doi.org/10.1038/s41598-023-33205-z", "title": "Method-comparison study between a watch-like sensor and a cuff-based device for 24-h ambulatory blood pressure monitoring.", "journal": "Scientific Reports", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: the authors' institute holds the patent on the method tested, and two authors are its inventors" ] } }, { "role": "conflicting", "id": "doi:10.1097/hjh.0000000000003960", "url": "https://doi.org/10.1097/HJH.0000000000003960", "title": "Evaluation of Aktiia cuffless blood pressure monitor across 24-h, daytime, and night-time measurements versus ambulatory monitoring: a prospective, single-centre observational study.", "journal": "Journal of Hypertension", "year": 2025, "industry_ties": { "checked": true, "author_affiliations": [ "Aktiia" ], "funders": [], "stated_ties": [] } }, { "role": "conflicting", "id": "doi:10.1097/hjh.0000000000003428", "url": "https://doi.org/10.1097/hjh.0000000000003428", "title": "Evaluation of the ability of a commercially available cuffless wearable device to track blood pressure changes", "journal": "Journal of Hypertension", "year": 2023, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "conflict statement: Aktiia supplied the devices tested, and two authors have been paid by Aktiia" ] } }, { "role": "supporting", "id": "doi:10.1097/mbp.0000000000000804", "url": "https://doi.org/10.1097/MBP.0000000000000804", "title": "Photoplethysmography based remote cardiac blood pressure monitoring compared with 24-h ambulatory blood pressure monitoring.", "journal": "Blood Pressure Monitoring", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } }, { "role": "supporting", "id": "doi:10.1038/s41440-026-02759-6", "url": "https://doi.org/10.1038/s41440-026-02759-6", "title": "Validation of ring-type cuffless blood pressure (BP) monitoring device for detecting awake-asleep BP variations compared to ambulatory BP monitoring device.", "journal": "Hypertension Research", "year": 2026, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [ "funding statement: sponsored by Sky Labs, maker of the CART BP ring tested, which took part in study design and data collection" ] } }, { "role": "supporting", "id": "doi:10.3390/s23187931", "url": "https://doi.org/10.3390/s23187931", "title": "Nocturnal Blood Pressure Estimation from Sleep Plethysmography Using Machine Learning.", "journal": "Sensors", "year": 2024, "industry_ties": { "checked": true, "author_affiliations": [], "funders": [], "stated_ties": [] } } ] } ] }