Shoulder and elbow kinematics in throwing of young baseball players.
Shoulder and elbow kinematics in throwing of young baseball players.
复制标题
年轻棒球运动员投掷时的肩部和肘部运动学。
DOI：
10.1080/14763140608522873
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发表时间：
2006
影响因子：
2.2
通讯作者：
Y. Hirano
中科院分区：
文献类型：
--
作者：
K. Ishida;M. Murata;Y. Hirano
本研究比较不同年龄组少年棒球选手投掷动作之运动学特征。对44名年龄在6.1 ~ 12.3岁的日本棒球运动员的投球动作进行了三维高速摄像分析。在这个样本中，26名9岁以上的球员被归类为高级组，其余18名被归类为初级组。高年级组的投掷运动员比低年级组的投掷运动员有更大的身高和体重，并且产生更大的球速。高水平团体投掷运动员的投掷臂动作与成年技术运动员相似。然而，在投掷运动员的手臂加速阶段，在低年级组，肩水平内收角较大，最大角速度的肘关节伸展和肩关节内旋出现后，比高年级组。结果表明，9岁以上运动员投掷臂动作的掌握较为成熟，9岁以下运动员投掷臂动作的掌握较为不成熟。出现这些差异的一个可能原因是，官方棒球对少年组投掷者来说相对较重;他们最好在投掷练习中使用较轻的球。
In this study we compared the kinematic features of the throwing motion between young baseball players of different age groups. Forty-four Japanese baseball players aged 6.1 to 12.3 years who regularly played baseball, including pitchers and position players, had their throwing actions analyzed three-dimensionally using high speed videography. Of this sample, 26 players aged above 9 years of age were categorized as the senior group, while the remaining 18 were categorized as the junior group. Senior group throwers had greater height and body mass, and produced a greater ball speed than junior group throwers. The throwing arm movement of senior group throwers was similar to that of adult skilled players. However, in the junior group throwers, the shoulder horizontal adduction angle was larger during the arm acceleration phase, and the maximum angular velocities of elbow extension and shoulder internal rotation occurred later than in senior group throwers. These results indicate that players aged above 9 years can acquire a mature throwing arm movement, while players younger than that will use an immature motion. A possible reason why these differences were shown is that the official baseball is relatively heavy for junior group throwers; they would be better advised to use a lighter ball in throwing practice.