학술논문
Validation of a consumer-grade activity monitor for continuous daily activity monitoring in individuals with multiple sclerosis
Document Type
article
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Source
Multiple Sclerosis Journal - Experimental Translational and Clinical. 5(4)
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Language
Abstract
BackgroundTechnological advancements of remote-monitoring used in clinical-care and research require validation of model updates.ObjectivesTo compare the output of a newer consumer-grade accelerometer to a previous model in people with multiple sclerosis (MS) and to the ActiGraph, a waist-worn device widely used in MS research.MethodsThirty-one individuals with MS participated in a 7-day validation by the Fitbit Flex (Flex), Fitbit Flex-2 (Flex2) and ActiGraph GT3X. Primary outcome was step count. Valid epochs of 5-min block increments, where there was overlap of ≥1 step/min for both devices were compared and summed to give a daily total for analysis.ResultsBland-Altman plots showed no systematic difference between the Flex and Flex2; mean step-count difference of 25 more steps-per-day more recorded by Flex2 (95% confidence intervals (CI) = 2, 48; p = 0.04),interclass correlation coefficient (ICC) = 1.00. Compared to the ActiGraph, Flex2 (and Flex) tended to record more steps (808 steps-per-day more than the ActiGraph (95% CI= -2380, 765; p