Validation of Health Tag Step Counting to Fitbit

Validation of Health Tag Step Counting to Fitbit

Abstract—Actigraphy is an important indicator for the remote monitoring of chronic disease patients. There is a need for longitudinal actigraphy at high adherence and accuracy, especially for daily living tasks that often involve slower and irregular walking compared to exercise. This report summarizes a validation study comparing the step-counting function of the Health Tags in varied walking tasks with reference pedometers (Fitbit Charge and Omron HJ-321) and ground truth in 33 healthy volunteers, with an emphasis on slower walking. Across both treadmill and daily life tasks, Health Tag correlated with ground truth (r=0.88) greater than Fitbit (r=0.70) and Omron (r=0.73) and detected steps with less error as well (11.9%, 18.3%, and 40.2%, respectively). In slow and very slow real-world walking tasks, Health Tag’s error was 39.5% less than Fitbit and 57.9% less than Omron. Finally, in slow and very slow controlled treadmill walking, Health Tag produced 64.0% and 91.1% less error than the reference devices, respectively.

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