異なる運動肢位での肩外旋運動における開始局面の肩周囲筋の活動様相

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【Purpose】The purpose of this study was that EMG onset of five selected shoulder muscles (suprspinatus, infraspinatus, teres minor, posterior deltoid, and middle trapezius) at onset phase during shoulder external rotation in different exercise positions. 【Methods】Five healthy male subjects (age ; 23.5±0.5yr) without any history of shoulder pathology and instability participated in the experiment. They performed the rapid isometric shoulder external rotation with different positions (20 degrees scapular plane abduction ; 20Abd and 90 degrees scapular plane abduction ; 90Abd) as much as possible. The electromyogram was recorded from the supraspinatus, infraspinatus, and teres minor with bipolar fine-wire intramuscular electrode, and then the posterior deltoid, middle trapezius with bipolar surface electrode. EMG onset was measured from EMG activity of each muscle during shoulder external rotation in both positions, and then each data compared the difference of EMG onset (DifOnset) as the standard in EMG onset of the infraspinatus. 【Results】 The infraspinatus and teres minor were significant active prior to the supraspinatus and posterior deltoid during shoulder external rotation in both positions (P<0.05). The middle trapezius was also significant active prior to the supraspinatus and posterior deltoid during shoulder external rotation seen in 20Abd (P<0.05). In contrast, DifOnset of this muscle in 90Abd did not observe the similar results seen in 20Abd. 【Conclusion】These results suggested that the infraspinatus and the teres minor act as the stabilizer in the glenohumeral joint during the shoulder external rotation regardless of exercise positions.
九州共立大学の論文

異なる運動肢位での肩外旋運動における開始局面の肩周囲筋の活動様相

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