ArticleBMC research notes2014
The validation of Fibit Zip™ physical activity monitor as a measure of free-living physical activity.
Article in BMC research notes, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT03906942 (Using Team Science to Promote Health-Enhancing Physical Activity in Adults With Obesity in a Community Setting), which is not on this map. Cited by 84 papers, 4 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Using Team Science to Promote Health-Enhancing Physical Activity in Adults With Obesity in a Community Setting: A Feasibility Study
Who cites it
84 citing papers in PubMed, 4 syntheses or guidelines pooled it.
- Quality Evaluation of Free-living Validation Studies for the Assessment of 24-Hour Physical Behavior in Adults via Wearables: Systematic Review.JMIR mHealth and uHealth · 2022Pooled it
- Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review.JMIR mHealth and uHealth · 2020Pooled it
- Pooled it
- Systematic review of the validity and reliability of consumer-wearable activity trackers.The international journal of behavioral nutrition and physical activity · 2015Pooled it
- Enhancing the Physical Activity Levels of Frail Older Adults with a Wearable Activity Tracker-Based Exercise Intervention: A Pilot Cluster Randomized Controlled Trial.International journal of environmental research and public health · 2021Trial
- Acceptability and Effects of Commercially Available Activity Trackers for Chronic Pain Management Among Older African American Adults.Pain medicine (Malden, Mass.) · 2020Trial
- Trial
- Walk to a better night of sleep: testing the relationship between physical activity and sleep.Sleep health · 2019Trial
- Recruitment and Retention of Asian Americans in Web-Based Physical Activity Promotion Programs: A Discussion Paper.Computers, informatics, nursing : CIN · 2019Trial
- "Worth the Walk": Culturally Tailored Stroke Risk Factor Reduction Intervention in Community Senior Centers.Journal of the American Heart Association · 2019Trial
- Financial Incentives and Health Coaching to Improve Physical Activity Following Total Knee Replacement: A Randomized Controlled Trial.Arthritis care & research · 2018Trial
- Trial
- Adaptive goal setting and financial incentives: a 2 × 2 factorial randomized controlled trial to increase adults' physical activity.BMC public health · 2017Trial
- Estimating Physical Activity and Sedentary Behavior in a Free-Living Context: A Pragmatic Comparison of Consumer-Based Activity Trackers and ActiGraph Accelerometry.Journal of medical Internet research · 2016Trial
- Trial
- A Pilot Randomized Trial of an Intervention to Enhance the Health-Promoting Effects of Older Adults' Activity Portfolios: The Engaged4Life Program.Journal of gerontological social workTrial
- Advancement in wrist worn physical activity trackers: technological developments and measurement accuracy: a systematic review.Frontiers in digital health · 2026Review
- Digital, Personalized Clinical Trials Among Older Adults, Lessons Learned From the COVID-19 Pandemic, and Directions for the Future: Aggregated Feasibility Data From Three Trials Among Older Adults.Journal of medical Internet research · 2025Article
- Using a Consumer Wearable Activity Monitoring Device to Study Physical Activity and Sleep Among Adolescents in Project Viva: Cohort Study.JMIR pediatrics and parenting · 2025Article
- Article
24 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
Abstract
backgroundThe new generation of activity monitors allow users to upload their data to the internet and review progress. The aim of this study is to validate the Fitbit Zip as a measure of free-living physical activity.
findingsParticipants wore a Fitbit Zip, ActiGraph GT3X accelerometer and a Yamax CW700 pedometer for seven days. Participants were asked their opinion on the utility of the Fitbit Zip. Validity was assessed by comparing the output using Spearman's rank correlation coefficients, Wilcoxon signed rank tests and Bland-Altman plots. 59.5% (25/47) of the cohort were female. There was a high correlation in steps/day between the Fitbit Zip and the two reference devices (r = 0.91, p < 0.001). No statistically significant difference between the Fitbit and Yamax steps/day was observed (Median (IQR) 7477 (3597) vs 6774 (3851); p = 0.11). The Fitbit measured significantly more steps/day than the Actigraph (7477 (3597) vs 6774 (3851); p < 0.001). Bland-Altman plots revealed no systematic differences between the devices.
conclusionsGiven the high level of correlation and no apparent systematic biases in the Bland Altman plots, the use of Fitbit Zip as a measure of physical activity. However the Fitbit Zip recorded a significantly higher number of steps per day than the Actigraph.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.