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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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