The purpose of the present pilot study was to validate the timing and position accuracy of the centre of mass (COM) during a replicative snowboarding training session using a previously validated motion capture system (Simi Motion®) and a mobile markerless monocular motion capture application (SPLYZA Motion). The positional timing of the two-dimensional (2D) COM motion between the two systems were validated in an indoor laboratory condition as two elite snowboarders performed three individual movements, namely a static (isometric) pose as a proxy method for ground truth validation followed by a vertical jump and a single rotation. The position of the COM was reported in a local reference frame. High levels of agreement were found in both the x (anteroposterior) and y (vertical) axis. The approach of using motion capture and video footage to validate the raw timing data showed a moderate level of correlation in the x axis (r = 0.84) and a very high correlation in the y axis (r = 1.0). While reasons for the moderate correlation in the x axis remain unclear, further research should be performed to obtain a greater estimation of the COM positional trajectory to further refine the mobile application`s algorithm.
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