This study aimed to examine validity of the video-based method for obtaining step length during sprint acceleration when compared with the center of pressure (COP) position. Four well-trained male sprinters performed 50-m sprint for eight times each. The foot location and step length were obtained using video image for 24 steps. The Intra-class correlation coefficients between COP position and video-based method showed high validity (>0.847) for foot location and step length. Although there was a significant magnitude-error correlation (r = -0.972) for the foot location, corresponding correlation was not significant for step length (r = 0.081). Accordingly, the results suggest that video-based method has enough validity for obtaining step length during sprint acceleration when compared with COP position.
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