Agreement Between Spatiotemporal Gait Parameters Measured by a Markerless Motion Capture System and Two Reference Systems—a Treadmill-Based Photoelectric Cell and High-Speed Video Analyses: Comparative Study
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Materia
OptoGait Runners Sports technology Validity Gait Motion capture Video Feasibility Accuracy Kinect
Date
2020-10-23Referencia bibliográfica
García-Pinillos, F., Jaén-Carrillo, D., Hermoso, V. S., Román, P. L., Delgado, P., Martinez, C., ... & Seruendo, L. R. (2020). Agreement Between Spatiotemporal Gait Parameters Measured by a Markerless Motion Capture System and Two Reference Systems—a Treadmill-Based Photoelectric Cell and High-Speed Video Analyses: Comparative Study. JMIR mHealth and uHealth, 8(10), e19498. [doi: 10.2196/19498]
Résumé
Background: Markerless systems to capture body motion require no markers to be attached to the body, thereby improving
clinical feasibility and testing time. However, the lack of markers might affect the accuracy of measurements.
Objective: This study aimed to determine the absolute reliability and concurrent validity of the Kinect system with MotionMetrix
software for spatiotemporal variables during running at a comfortable velocity, by comparing data between the combination
system and two widely used systems—OptoGait and high-speed video analysis at 1000 Hz.
Methods: In total, 25 runners followed a running protocol on a treadmill at a speed of 12 km/h. The Kinect+MotionMetrix
combination measured spatiotemporal parameters during running (ie, contact time, flight time, step frequency, and step length),
which were compared to those obtained from two reference systems.
Results: Regardless of the system, flight time had the highest coefficients of variation (OptoGait: 16.4%; video analysis: 17.3%;
Kinect+MotionMetrix: 23.2%). The rest of the coefficients of variation reported were lower than 8.1%. Correlation analysis
showed very high correlations (r>0.8; P<.001) and almost perfect associations (intraclass correlation coefficient>0.81) between
systems for all the spatiotemporal parameters except contact time, which had lower values. Bland-Altman plots revealed smaller
systematic biases and random errors for step frequency and step length and larger systematic biases and random errors for temporal
parameters with the Kinect+MotionMetrix system as compared to OptoGait (difference: contact time +3.0%, flight time −7.9%)
and high-speed video analysis at 1000 Hz (difference: contact time +4.2%, flight time −11.3%). Accordingly, heteroscedasticity
was found between systems for temporal parameters (r2>0.1).
Conclusions: The results indicate that the Kinect+MotionMetrix combination slightly overestimates contact time and strongly
underestimates flight time as compared to the OptoGait system and high-speed video analysis at 1000 Hz. However, it is a valid
tool for measuring step frequency and step length when compared to reference systems. Future studies should determine the
reliability of this system for determining temporal parameters.