Three-Dimensional Kinematic and Kinetic behavior of the Pelvic Rotation in Mini-Hurdle Sprint: Comparisons to Normal Sprint

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The purpose of this study was to investigate the kinematics and kinetics of pelvic rotation in mini-hurdle sprint, including regulated step length and increased step frequency, by comparing mini-hurdle sprint to normal sprint. Twelve male sprinters performed a 60 m sprint with mini-hurdles from a standing start and a 60 m regular sprint from a crouching start. Three-dimensional motion analysis was performed to investigate the kinematics and kinetics of pelvic rotation in the mini-hurdle sprint. The step frequency was significantly higher, and the step length was significantly lower in the mini-hurdle sprint than in the normal sprint. The pelvic rotation angle at toe-off and displacement of the pelvic forward rotation toward free leg side angle in the stance phase were significantly greater in the mini-hurdle sprint than in the normal sprint. The integrated contributory component of the lumbosacral joint torsion angular impulse was significantly greater during the stance phase and smaller during the flight phase in the mini-hurdle sprint than in the normal sprint. Overall, the mini-hurdle sprint exerted the free leg side lumbosacral joint torsional torque was greater during the stance phase and smaller during the flight phase compared to the normal sprint, resulting in the greater forward rotation on the pelvis of the stance leg side toward the free leg side prior to toe-off and contributing to faster recovery leg motion to increase high step frequency.

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