Only one study assessed distance for the Fitbit, finding an over-estimate at slower speeds and under-estimate at faster speeds. For laboratory-based studies using step counting or accelerometer steps, the correlation with tracker-assessed steps was high for both Fitbit and Jawbone (Pearson or intraclass correlation coefficients (CC) > =0.80). In total, 22 studies were included in the review (20 on adults, 2 on youth). Two people reviewed and abstracted each included study. Searches included only full-length English language studies published in PubMed, Embase, SPORTDiscus, and Google Scholar through July 31, 2015. The purpose of this systematic review was to summarize the evidence for validity and reliability of popular consumer-wearable activity trackers (Fitbit and Jawbone) and their ability to estimate steps, distance, physical activity, energy expenditure, and sleep. Consumer-wearable activity trackers are electronic devices used for monitoring fitness- and other health-related metrics.
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