The effects of relative trunk rotation velocity on ball speed and elbow and shoulder joint torques during baseball pitching
The effects of relative trunk rotation velocity on ball speed and elbow and shoulder joint torques during baseball pitching
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棒球投球过程中躯干相对旋转速度对球速和肘肩关节扭矩的影响
DOI：
10.1080/14763141.2022.2129431
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发表时间：
2022
影响因子：
2.2
通讯作者：
Harukazu Tohyama
中科院分区：
文献类型：
--
作者：
Yousuke Tanaka;Tomoya Ishida;Takumi Ino;Yuki Suzumori;Mina Samukawa;Satoshi Kasahara;Harukazu Tohyama
在棒球投球中，在手臂抬高的早期阶段，在旋转骨盆的同时抑制躯干旋转，这对投掷快速球很重要。然而，投球时躯干旋转的定量评估还没有建立起来，它与肘部和肩部扭矩的关系也不清楚。这项研究的目的是检验一种新的躯干旋转抑制措施与投球速度以及投球过程中肘关节和肩部扭矩的相关性。18名成年男子棒球投手(21.7 ± 1.2 )参加。使用三维运动捕捉系统分析了三个合格的投球。躯干旋转速度，归一化为峰值速度，是在骨盆速度峰值时得出的。采用皮尔逊相关系数确定相关系数。躯干旋转速度与肘外翻扭矩(R= −0.508，P= 0.032)、肩关节外旋扭矩(R= −0.507，P= 0.032)和球速(R= −0.504，P= 0.033)显著相关。在骨盆旋转速度达到峰值时，较小的躯干旋转角速度可以提高球的速度，但也可能增加脚触地后躯干旋转的投手的肘部和肩部扭矩。
In baseball pitching, suppressing trunk rotation while rotating the pelvis in the early phase of arm cocking is important for throwing a fast ball. However, quantitative evaluation of trunk rotation during pitching has not been established, and its associations with elbow and shoulder torques are unclear. The purpose of this study was to examine the correlation of a new measure of trunk rotation suppression with ball speed and elbow and shoulder torques during pitching. Eighteen adult male baseball pitchers (21.7 ± 1.2 years old) participated. Three qualified pitches were analysed using a three-dimensional motion capture system. Trunk rotation velocity, normalised to the peak velocity, was derived at the time of peak pelvic velocity. Pearson’s correlation coefficient was used to determine correlations. The normalised trunk rotation velocity at the peak pelvic velocity was significantly correlated with elbow valgus torque (R= −0.508,P= 0.032), shoulder external rotation torque (R= −0.507,P= 0.032) and ball speed (R= −0.504,P= 0.033). A smaller normalised trunk rotation angular velocity at the time of peak pelvic rotation velocity could increase ball speed but may also increase elbow and shoulder torques among pitchers who demonstrate trunk rotation after foot contact.