Effect of the pitching on specific tension of rotator cuff muscles in shoulder.

本研究的目的是探讨投球对棒球投手肩袖肌肉特定张力的影响。我们测量了40名男性（10 - 21岁）冈上肌的横截面积、肩外展强度和特定张力。19 ~ 21岁组冈上肌比张力明显高于10 ~ 12岁组。我们测量了45名大学运动员（棒球投手、棒球外野手、投掷运动员和体操运动员）冈上肌的横截面积、肩外展力量和特定张力。提示长期持续的棒球投球并不会导致冈上肌质量的下降。

The purpose of this study was to investigate the effect of pitching on specific tension of rotator cuff muscles in baseball pitchers.Cross-sectional area of supraspinatus muscle, shoulder abduction strength, and specific tension were measured in in 40 men (10 to 21 years). The 19-21 age group showed significantly higher specific tension of supraspinatus than that of 10-12 age group. Cross-sectional area of supraspinatus muscle,shoulder abduction strength, and specific tension were measured in 45 collegiate athletes (baseball pitchers,baseball fielders, throwing athletes, and gymnastics). It is suggested that the long-term continuation of the baseball pitching don't lead to a decrease in the quality of supraspinatus muscle.