An EMG analysis of the shoulder in pitching
An EMG analysis of the shoulder in pitching
复制标题
俯仰时肩部的肌电图分析
DOI：
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发表时间：
1984
影响因子：
4.8
通讯作者：
J. Perry
中科院分区：
文献类型：
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作者：
F. Jobe;D. Moynes;J. Tibone;J. Perry
这是一系列项目中的第二份报告，涉及投掷过程中上肢的肌电图（EMG）分析。更好地了解肌肉激活模式可能会导致更有效的季前训练方案和康复计划。留置丝电极记录输出的二头肌，长头和侧头的三头肌，胸大肌，背阔肌，前锯肌，和肱四个职业棒球投手。这些信号与快球的高速胶片记录电子同步。将肌电信号从模拟记录转换为数字记录。结果表明，发条和早期公鸡阶段显示所有肌肉的活动最小，这种发射发生的强度低。在前脚站稳后发生的延迟的公鸡，显示二头肌的适度活动。公鸡是由胸大肌和背阔肌终止。此时，躯干开始向前旋转，而手臂保持抬高，手肘弯曲。此外，肩关节正向最大外旋方向移动。在加速阶段，二头肌明显静止，而胸大肌，背阔肌，三头肌和前锯肌都活跃。此时的肌肉动作终止了外旋和肘屈曲;即，肌肉作为减速器被激发，并且还启动球加速、内旋转和肘伸展的相反动作。后续通过不仅是一个时间的离心收缩与肌肉活动减速上肢复合体，它也是一个积极的事件与肩移动整个身体和手肘进入伸展与前臂旋前。
This is the second report in a series of projects dealing with electromyographic (EMG) analysis of the upper extremity during throwing. Better understanding of the muscle activation patterns could lead to more effective preseason conditioning regimens and rehabilitation pro grams. Indwelling wire electrodes recorded the output from the biceps, long and lateral heads of the triceps, pectoralis major, latissimus dorsi, serratus anterior, and brachialis for four professional baseball pitchers. These signals were synchronized electronically with high speed film records of a fast ball. The EMG signals were converted from analog to digital records. Results showed that wind-up and early cocking phases showed minimal activity in all muscles, and such firing which occurred was of low intensity. Late cocking, which occurred after the front foot was firmly planted, showed moderate activity in the biceps. Cocking was termi nated by the pectoralis major and latissimus dorsi. At this point, the trunk began to rotate forward, while the arm remained elevated and the elbow flexed. Also, the shoulder was moving to maximum external rotation. During the acceleration phase, the biceps was notably quiescent, while the pectoralis major, latissimus dorsi, triceps, and serratus anterior were all active. Muscle action at this time terminated external rotation and elbow flexion; i.e., the muscles fired as decelerators and also initiated the opposite actions for ball acceler ation, internal rotation and elbow extension. Follow- through was not only a time of eccentric contraction with muscle activity decelerating the upper extremity complex, it was also an active event with the shoulder moving across the body and the elbow into extension with forearm pronation.