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PDF) Validity Evaluation of the Fitbit Charge2 and the Garmin VivoSmart HR+ in Free-Living Environments in an Old Adult Cohort (Preprint)
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The validity of activity trackers is affected by walking speed: the criterion validity of Garmin Vivosmart® HR and StepWatch™ 3 for measuring steps at various walking speeds under controlled conditions [PeerJ]
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