{
  "registry": "KnowYourPrime Evidence Registry",
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "Credit KnowYourPrime and link to the finding URL."
  },
  "fields": {
    "devices": "Devices this finding names, including models it says it does not cover. What was actually tested is in scope.applies_to; exclusions are in scope.does_not_cover.",
    "evidence": "Studies by role: anchor (the rating rests on it), conflicting, null_result, supporting.",
    "industry_ties": "Device-maker ties listed in Europe PMC metadata: author_affiliations names makers an author lists as an affiliation, funders names makers listed as funding. stated_ties holds ties a paper states only in its own conflict, funding or acknowledgement text, each read from that statement and worded to say only what it says. Sources are Europe PMC metadata, funding printed in the abstract, and those reviewed statements. An empty list means no tie was found there, not that the study is independent: many papers have no open full text to read. Metadata, not a judgment of the study. checked false means no Europe PMC metadata was available."
  },
  "id": "KYP-ER-0012",
  "version": "1.0",
  "reviewed": "2026-10-24",
  "url": "https://knowyourprime.com/evidence-do-activity-trackers-increase-activity",
  "title": "Do Activity Trackers Make People More Active?",
  "question": "Does using a consumer activity tracker increase how physically active people become?",
  "measurement": "Physical activity",
  "devices": [
    "Fitbit",
    "Activity trackers"
  ],
  "rating": {
    "label": "Uncertain",
    "code": "uncertain",
    "definition": "Evidence is conflicting, inconsistent, or difficult to interpret.",
    "rule_version": "1.6",
    "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.",
      "Null-result evidence bears directly on the claimed effect.",
      "Some evidence conflicts on secondary points that do not change the core direction."
    ]
  },
  "conclusion": "A little, on average, in controlled trials, and not reliably. A meta-analysis found small increases in steps and moderate to vigorous activity, while a 488-person trial found no overall effect, and most trials measured the change over weeks to months rather than years.",
  "reasoning": [
    "The claim is about behavior, not measurement: whether wearing a tracker changes what people do.",
    "One meta-analysis of controlled trials affirms a small increase. A randomized trial testing trackers against no intervention and a paper diary found no overall difference, and a Cochrane review in stroke survivors found too little evidence to support the effect. With a single affirming anchor and a core-hitting null, the rule rates the claim Uncertain."
  ],
  "key_results": [
    {
      "text": "In a meta-analysis of controlled trials, tracker interventions increased daily steps (standardized mean difference 0.24, 95 percent CI 0.16 to 0.33), moderate to vigorous activity (0.27) and energy expenditure (0.28), with no significant change in sedentary behavior.",
      "source": "doi:10.2196/11819",
      "source_url": "https://doi.org/10.2196/11819",
      "source_citation": "Brickwood et al., JMIR mHealth and uHealth, 2020"
    },
    {
      "text": "In a 12-week randomized trial of 488 inactive adults comparing no intervention, a paper diary, a tracker and a tracker with coaching, there was no overall difference between groups in activity energy expenditure or fitness.",
      "source": "doi:10.1016/j.amepre.2020.10.010",
      "source_url": "https://doi.org/10.1016/j.amepre.2020.10.010",
      "source_citation": "Hajna et al., American Journal of Preventive Medicine, 2021"
    }
  ],
  "scope": {
    "applies_to": "Consumer wearable activity trackers used to increase physical activity in adults, compared with no tracker or a non-tracker intervention.",
    "does_not_cover": "Health outcomes such as weight or blood pressure; workplace program savings; tracker measurement accuracy."
  },
  "limitations": [
    "Standardized mean differences around 0.25 are small effects.",
    "Most trials run for weeks to months, and gains often decline after the intervention ends."
  ],
  "evidence": {
    "anchor": [
      {
        "key": "doi:10.2196/11819",
        "title": "Consumer-Based Wearable Activity Trackers Increase Physical Activity Participation: Systematic Review and Meta-Analysis.",
        "first_author": "Brickwood",
        "journal": "JMIR mHealth and uHealth",
        "year": 2020,
        "url": "https://doi.org/10.2196/11819",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      }
    ],
    "conflicting": [
      {
        "key": "doi:10.1002/14651858.cd012543.pub2",
        "title": "Activity monitors for increasing physical activity in adult stroke survivors.",
        "first_author": "Lynch",
        "journal": "The Cochrane database of systematic reviews",
        "year": 2018,
        "url": "https://doi.org/10.1002/14651858.CD012543.pub2",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      }
    ],
    "null_result": [
      {
        "key": "doi:10.1016/j.amepre.2020.10.010",
        "title": "Effectiveness of Minimal Contact Interventions: An RCT.",
        "first_author": "Hajna",
        "journal": "American journal of preventive medicine",
        "year": 2021,
        "url": "https://doi.org/10.1016/j.amepre.2020.10.010",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      }
    ],
    "supporting": [
      {
        "key": "doi:10.2147/copd.s611518",
        "title": "A Web-Based Pedometer-Mediated Intervention Maintains Benefits After Pulmonary Rehabilitation: A Pilot Study.",
        "first_author": "Desiato",
        "journal": "International journal of chronic obstructive pulmonary disease",
        "year": 2026,
        "url": "https://doi.org/10.2147/COPD.S611518",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      },
      {
        "key": "doi:10.2147/copd.s611540",
        "title": "A Web-Based, Pedometer-Mediated Intervention Increases Amount and Intensity of Physical Activity in COPD: A Randomized Controlled Trial.",
        "first_author": "Bamonti",
        "journal": "International journal of chronic obstructive pulmonary disease",
        "year": 2026,
        "url": "https://doi.org/10.2147/COPD.S611540",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      },
      {
        "key": "doi:10.1177/03000605261485388",
        "title": "The use of artificial intelligence and wearable devices in enhanced recovery after surgery pathways following radical cystectomy: A systematic review.",
        "first_author": "Feyissa",
        "journal": "The Journal of international medical research",
        "year": 2026,
        "url": "https://doi.org/10.1177/03000605261485388",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      },
      {
        "key": "doi:10.1136/bmjopen-2024-084086",
        "title": "Use of commercially available wearable devices for physical rehabilitation in healthcare: a systematic review.",
        "first_author": "Latif",
        "journal": "BMJ open",
        "year": 2024,
        "url": "https://doi.org/10.1136/bmjopen-2024-084086",
        "industry_ties": {
          "checked": true,
          "author_affiliations": [],
          "funders": [],
          "stated_ties": []
        }
      }
    ]
  },
  "evidence_last_evaluated": "Oct 15, 2026",
  "rating_history": [
    {
      "date": "2026-07-20",
      "rating": "Emerging",
      "from": null,
      "rule_version": "1.4"
    },
    {
      "date": "2026-10-15",
      "rating": "Uncertain",
      "from": "Emerging",
      "rule_version": "1.6"
    }
  ],
  "versions": [
    {
      "version": "1.0",
      "date": "2026-10-24",
      "rating": "Uncertain",
      "change": "First published."
    }
  ],
  "research_desk": "https://knowyourprime.com/research-desk-activity#behavior-change",
  "related_findings": [
    "https://knowyourprime.com/evidence-work-stress-hrv"
  ],
  "related_articles": [
    "https://knowyourprime.com/does-wearing-a-fitness-tracker-actually-make-you-more-active",
    "https://knowyourprime.com/do-fitness-trackers-improve-health-outcomes",
    "https://knowyourprime.com/do-workplace-wellness-programs-work"
  ],
  "methodology": "https://knowyourprime.com/methodology",
  "citation": "KnowYourPrime Evidence Registry, Finding KYP-ER-0012, version 1.0, reviewed 2026-10-24. https://knowyourprime.com/evidence-do-activity-trackers-increase-activity"
}