EXAMINING THE RELIABILITY AND VALIDITY OF THE FITBIT® CHARGE 2™ ON STEP COUNT DURING TREADMILL EXERCISE

The purpose of this study was to determine the reliability and validity of the Fitbit® Charge 2™ to count steps during a treadmill protocol. The participants wore a Fitbit® Charge 2™ on their wrist. 16 participants who met inclusion criteria were assigned to the following testing conditions; GPS stride length/manual stride length and hold/no-hold onto the handrails of the treadmill. The participants completed a walking protocol that included light (60% of HRR) intensities. The Fitbit® Charge 2™ step count and the manually counted steps were documented. Intraclass Correlation Coefficients (ICC) analysis found that the Fitbit® Charge 2™ was not reliable or valid to count steps