The Accuracy of Smart Devices for Measuring Physical Activity in Daily Life: Validation Study.
Laurent DegrooteIlse de BourdeaudhuijMaïté VerloigneLouise PoppeGeert CrombezPublished in: JMIR mHealth and uHealth (2018)
In sum, all 4 consumer-level devices can be considered accurate step counters in free-living conditions. This study, however, provides evidence of systematic bias for all devices in measurement of MVPA. The results on a 15-min level also indicate that these devices are not sufficiently accurate to provide correct real-time feedback.