This study aimed to explore the feasibility of using OpenCap with a lab-based multi-camera motion capture (MOCAP) system and to evaluate the influence of camera configurations on the trunk and lower-limb kinematic accuracy for athletic movements. Six top-level female football players performed drop jump (DJ) and sidecut (SC) tasks while their motion was recorded synchronously by marker- and video-based cameras. Lower-limb and trunk joint angles, as well as pelvis translations and rotations, obtained with three camera configurations—two, four, and eight cameras—were compared with the marker-based reference. Statistical parametric mapping repeated measures ANOVAs revealed significant differences in kinematic waveforms, decreasing from 16 and 14 degrees of freedom in the two-camera configuration during DJ and SC, respectively, to 9 degrees of freedom in the eight-camera configuration. Improvements in root mean square error were also observed in pelvis anterior–posterior translation and pelvis rotation in both tasks; vertical translations, right ankle dorsiflexion, and inversion in DJ; lumbar bending, and right hip rotation in SC. The result suggested that using a lab-based MOCAP system with more cameras could modestly enhance accuracy and provide several advantages, e.g., broader camera coverage. However, further investigation is needed to ensure the differences are biomechanically meaningful.
Lei et al. (Thu,) studied this question.
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