Kinetic function of the lower limbs during baseball tee-batting motion at different hitting-point heights
Kinetic function of the lower limbs during baseball tee-batting motion at different hitting-point heights
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DOI：
10.1080/14763141.2018.1497195
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发表时间：
2020-07-03
影响因子：
2.2
通讯作者：
Kawamura, Takashi
中科院分区：
文献类型：
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作者：
Ae, Kazumichi;Koike, Sekiya;Kawamura, Takashi
本研究旨在探讨棒球运动员在不同击球高度时下肢的运动功能，为改善击球技术提供关键资料。三维坐标数据采集使用运动捕捉系统（250 Hz）和地面反作用力进行了测量，使用三个力平台（1000 Hz）在22名男子大学棒球运动员在发球击球设置在三个不同的击球点高度（高，中，低）。动力学数据被用来计算关节扭矩和机械功在下肢的逆动力学方法。低海拔条件下，下躯干绕垂直轴的角速度峰值较小。髋关节内收/外展轴所做的关节力矩和机械功在三种情况下是不同的。这些结果表明，髋关节内收/外展扭矩主要有助于改变旋转运动的下半身围绕垂直轴时，调整不同的击球点高度。为了调整低击球点的高度，这将是困难的，与其他击球点的高度相比，击球手应专注于旋转下躯干缓慢增加两个髋关节外展扭矩。
The aim of this study was to investigate the kinetic functions of the lower limbs at different hitting-point heights to provide key information for improving batting technique in baseball players. Three-dimensional coordinate data were acquired using a motion capture system (250 Hz) and ground reaction forces were measured using three force platforms (1000 Hz) in 22 male collegiate baseball players during tee-batting set at three different hitting-point heights (high, middle, and low). Kinetic data were used to calculate joint torque and mechanical work in the lower limbs by the inverse dynamics approach. The peak angular velocity of the lower trunk about the vertical axis was smaller under the low condition. The joint torques and mechanical works done by both hip adduction/abduction axes were different among the three conditions. These results indicate that hip adduction/abduction torques mainly contribute to a change in the rotational movement of the lower body about the vertical axis when adjusting for different hitting-point heights. In order to adjust for the low hitting-point height which would be difficult compared with other hitting-point heights, batters should focus on rotating the lower trunk slowly by increasing both hip abduction torques.