The purpose of this study was to clarify the difference between normal sprinting (NS) and running over flat markers (FMR). Seven male collegiate sprinters participated in this study. The subjects initially ran 50 m normally, then over some markers set up on the runway, and finally they ran 50m normally. The leg motion of the three runs was compared by two-dimensional motion analysis. FMR showed a significant increase in stride frequency and running velocity. There was no significant difference in leg motion between NS and FMR. However, knee torque and torque power showed a significant increase between FMR-Pre and FMR-Post. The results suggested that the second sprint was influenced by FMR. FMR may be a good tool for sprinting improvement to obtain a higher stride frequency.
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