Pelvic Rotation Torque During Fast-Pitch Softball Hitting Under Three Ball Height Conditions
Pelvic Rotation Torque During Fast-Pitch Softball Hitting Under Three Ball Height Conditions
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DOI：
10.1123/jab.2013-0304
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发表时间：
2014-08-01
影响因子：
1.4
通讯作者：
Kojima, Takeji
中科院分区：
文献类型：
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作者：
Iino, Yoichi;Fukushima, Atsushi;Kojima, Takeji
本研究的目的是探讨快速投掷垒球时髋关节角度与骨盆旋转扭矩产生的相关性，以及球高度对这一产生的影响。13名高级女子垒球运动员在三个不同的高度击球：高、中、低。骨盆旋转扭矩定义为通过髋关节围绕骨盆上下轴线作用于骨盆的扭矩，该扭矩是根据运动学和力板数据使用反向动力学确定的。无论球的高度如何，髋关节后伸、髋关节后外旋、髋关节前内收和髋关节前屈扭矩都对骨盆旋转扭矩的产生有贡献。虽然内收扭矩和外旋扭矩的贡献在不同球体高度之间有显著差异，但由于抵消了这两种扭矩成分，三种球体高度之间髋关节前、后关节扭矩的贡献相似。髋关节扭矩分量的峰值时间有显著不同，这表明垒球击球手可能需要相当精确地调整扭矩施加的时间，以有效地旋转上半身。
The purpose of this study was to investigate the relevance of hip joint angles to the production of the pelvic rotation torque in fast-pitch softball hitting and to examine the effect of ball height on this production. Thirteen advanced female softball players hit stationary balls at three different heights: high, middle, and low. The pelvic rotation torque, defined as the torque acting on the pelvis through the hip joints about the pelvic superior-inferior axis, was determined from the kinematic and force plate data using inverse dynamics. Irrespective of the ball heights, the rear hip extension, rear hip external rotation, front hip adduction, and front hip flexion torques contributed to the production of pelvic rotation torque. Although the contributions of the adduction and external rotation torques at each hip joint were significantly different among the ball heights, the contributions of the front and rear hip joint torques were similar among the three ball heights owing to cancelation of the two torque components. The timings of the peaks of the hip joint torque components were significantly different, suggesting that softball hitters may need to adjust the timings of the torque exertions fairly precisely to rotate the upper body effectively.