Agreement between the spatiotemporal gait parameters from two different wearable devices and high-speed video analysis
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Daniel Boullosa, University of Brasilia, BRAZIL
García-Pinillos F, Latorre-Román PA´, Soto-Hermoso VM, Párraga-Montilla JA, PantojaVallejo A, Ramírez-Campillo R, et al. (2019) Agreement between the spatiotemporal gait parameters from two different wearable devices and high-speed video analysis. PLoS ONE 14(9): e0222872. https://doi.org/10.1371/journal. pone.0222872
SponsorshipThis study was funded by the University of La Frontera (Universidad de La Frontera, Temuco, Chile, Project DI19-0023). This grant was awarded to FGP. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
This study aimed to evaluate the concurrent validity of two different inertial measurement units for measuring spatiotemporal parameters during running on a treadmill, by comparing data with a high-speed video analysis (VA) at 1,000 Hz. Forty-nine endurance runners performed a running protocol on a treadmill at comfortable velocity (i.e., 3.25 ± 0.36 m.s-1). Those wearable devices (i.e., Stryd™ and RunScribe™ systems) were compared to a highspeed VA, as a reference system for measuring spatiotemporal parameters (i.e. contact time [CT], flight time [FT], step frequency [SF] and step length [SL]) during running at comfortable velocity. The pairwise comparison revealed that the Stryd™ system underestimated CT (5.2%, p < 0.001) and overestimated FT (15.1%, p < 0.001) compared to the VA; whereas the RunScribe™ system underestimated CT (2.3%, p = 0.009). No significant differences were observed in SF and SL between the wearable devices and VA. The intra class correlation coefficient (ICC) revealed an almost perfect association between both systems and high-speed VA (ICC > 0.81). The Bland-Altman plots revealed heteroscedasticity of error (r 2 = 0.166) for the CT from the Stryd™ system, whereas no heteroscedasticity of error (r 2 < 0.1) was revealed in the rest of parameters. In conclusion, the results obtained suggest that both foot pods are valid tools for measuring spatiotemporal parameters during running on a treadmill at comfortable velocity. If the limits of agreement of both systems are considered in respect to high-speed VA, the RunScribe™ seems to be a more accurate system for measuring temporal parameters and SL than the Stryd™ system.