Abstract
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 high-speed 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 (r2 = 0.166) for the CT from the Stryd™ system, whereas no heteroscedasticity of error (r2 < 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.
Highlights
Despite methodological differences (i.e., OptoGaitTM system vs. high-speed video analysis (VA) as the methods of reference), the results reported by the current study are in line with those reported by Garcıa-Pinillos et al [9] at similar running velocities (~3.3 m.s-1) with the StrydTM system underestimating CT (5.2%), overestimating FT (15.1%) and providing accurate SL and SF compared to highspeed VA
Since the RunScribeTM system reported smaller differences (i.e., 2.3% in CT, -3.2% in FT and < 1% in SF and SL) compared to the reference system used in the current work, the results suggest that this system is a more accurate device for measuring spatiotemporal parameters
Reliability data were not reported in the current study so, findings cannot be generalised to runs performed several days apart. Notwithstanding those points, the current study provides some insights into the validity of spatiotemporal parameters assesses from two new systems (i.e. StrydTM and RunScribeTM), by using a high-speed VA at 1,000 Hz as the gold standard, with a high frequency and high resolution, installed at surface level, which allowed a great accuracy for determining spatiotemporal parameters
Summary
The interest in running gait analysis is well justified since an important body of literature has demonstrated its key role in both maximizing athletic performance [1,2,3,4,5] and minimizing the PLOS ONE | https://doi.org/10.1371/journal.pone.0222872 September 24, 2019Foot pods and spatiotemporal parameters
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