Kinetic analysis of the lower limbs in baseball tee batting
Kinetic analysis of the lower limbs in baseball tee batting
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DOI：
10.1080/14763141.2017.1284257
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发表时间：
2017-01-01
影响因子：
2.2
通讯作者：
Kawamura, Takashi
中科院分区：
文献类型：
--
作者：
Ae, Kazumichi;Koike, Sekiya;Kawamura, Takashi
本研究的目的是探讨地面反作用力对身体整体旋转和与躯干和骨盆旋转相关的下肢关节扭矩的影响。共有22名男子大学棒球运动员参加了这项研究。通过运动捕捉系统（250 Hz）获取三维坐标数据，并通过三个测力平台（1, 000 Hz）测量双腿的地面反力。动力学数据被用来计算由地面反作用力产生的绕通过身体质心的垂直轴的力矩，以及计算下肢关节的扭矩和机械功。由双腿产生的外侧/内侧地面反作用力导致绕其垂直轴的大的全身力矩。髋关节屈曲/伸展、髋关节内收和膝关节伸展的关节力矩比其他关节力矩产生更大的机械功。为了获得高的球棒头速度，击球手应该通过利用两个臀部和跨步膝盖的扭矩在外侧/内侧方向推动两条腿，以增加整个身体的旋转。
The purpose of this study was to investigate effects of the ground reaction forces on the rotation of the body as a whole and on the joint torques of the lower limbs associated with trunk and pelvic rotation in baseball tee batting. A total of 22 male collegiate baseball players participated in this study. Three-dimensional coordinate data were acquired by a motion capture system (250Hz), and ground reaction forces of both legs were measured with three force platforms (1,000Hz). Kinetic data were used to calculate the moment about the vertical axis through the body's centre of mass resulting from ground reaction forces, as well as to calculate the torque and mechanical work in the lower limb joints. The lateral/medial ground reaction force generated by both legs resulted in the large whole body moment about its vertical axis. The joint torques of flexion/extension of both hips, adduction of the stride hip and extension of the stride knee produced significantly larger mechanical work than did the other joint torques. To obtain high bat-head speed, the batter should push both legs in the lateral/medial direction by utilising both hips and stride knee torques so as to increase the whole body rotation.