Research Article
Issue Date: March 01, 2019
Published Online: March 01, 2019
Updated: March 06, 2019
Measuring Reliability of Movement With Accelerometry: Fitbit® Versus ActiGraph®
Author Affiliations
  • Veronica T. Rowe, PhD, OTR/L, is Assistant Professor, Department of Occupational Therapy, University of Central Arkansas, Conway; vrowe@uca.edu
  • Marsha Neville, PhD, OT, is Associate Professor, School of Occupational Therapy, Texas Woman’s University, Dallas.
Article Information
Hand and Upper Extremity / Neurologic Conditions / Rehabilitation, Participation, and Disability / Stroke / Research Articles
Research Article   |   March 01, 2019
Measuring Reliability of Movement With Accelerometry: Fitbit® Versus ActiGraph®
American Journal of Occupational Therapy, March 2019, Vol. 73, 7302205150. https://doi.org/10.5014/ajot.2019.030692
American Journal of Occupational Therapy, March 2019, Vol. 73, 7302205150. https://doi.org/10.5014/ajot.2019.030692
Abstract

OBJECTIVE. We sought to determine the reliability of the Fitbit® Flex™ compared with the ActiGraph® Bluetooth® Smart wGT3X-BT wireless activity monitor and to contribute to the clinical utility of accelerometry measurement of upper extremity (UE) movement.

METHOD. Two studies were conducted at different sites with healthy adult participants. In Study 1, participants wore both accelerometers on both wrists during everyday activities for a 24-hr period. In Study 2, participants wore both accelerometers on the dominant wrist for 4 hr during an active period of the day. All participants wore the accelerometers during regular daily activities.

RESULTS. Data recorded from the Fitbit and the ActiGraph showed a high positive correlation; however, the Fitbit recorded significantly fewer movements than the ActiGraph.

CONCLUSION. Although the Fitbit and the ActiGraph measure UE activity similarly, the Fitbit was not as sensitive as the ActiGraph. This study provides informative data on the clinical utility of the Fitbit compared with the ActiGraph.