Activity trackers can potentially stimulate users to increase their physical activity behavior. The aim of this study was to examine the reliability and validity of ten consumer activity trackers for measuring step count in both laboratory and free-living conditions.

Thea J. M. Kooiman , Manon L. Dontje , Siska R. Sprenger, Wim P. Krijnen, Cees P. van der Schans and Martijn de Groot
BMC Sports Science, Medicine and Rehabilitation20157:24
DOI: 10.1186/s13102-015-0018-5