Systematic review of the validity and reliability of consumer-wearable activity trackers

摘要: Consumer-wearable activity trackers are electronic devices used for monitoring fitness- and other health-related metrics. The purpose of this systematic review was to summarize the evidence validity reliability popular consumer-wearable (Fitbit Jawbone) their ability estimate steps, distance, physical activity, energy expenditure, sleep. Searches included only full-length English language studies published in PubMed, Embase, SPORTDiscus, Google Scholar through July 31, 2015. Two people reviewed abstracted each study. In total, 22 were (20 on adults, 2 youth). For laboratory-based using step counting or accelerometer correlation with tracker-assessed steps high both Fitbit Jawbone (Pearson intraclass coefficients (CC) > =0.80). Only one study assessed distance Fitbit, finding an over-estimate at slower speeds under-estimate faster speeds. field-based compared accelerometry-assessed trackers, higher (Spearman CC 0.86, Fitbit) while another found a wide range (intraclass 0.36–0.70, Jawbone). Using several different comparison measures (indirect direct calorimetry, accelerometry, self-report), expenditure more often under-estimated by either tracker. Total sleep time efficiency over-estimated wake after onset comparing metrics from polysomnography tracker normal mode setting. No intradevice found. Interdevice reported seven but none Jawbone. Walking- running-based trials indicated consistently interdevice 0.76–1.00), 0.90–0.99), 0.71–0.97). When wearing two Fitbits sleeping, consistency between high. This few lower certain models. As new features introduced market, documentation measurement properties can guide use research settings.