肩挙上における2種類の肩甲骨運動‐上腕外旋角度と筋活動の相違

概要

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We have documented that 2 types of scapular motion were identified during shoulder elevation. The purpose of this study was to compare the angle of humeral external rotation and EMG of the perishoulder muscles between G and S types. Eleven healthy young men attended the present study. Every participant had 8 skin makers and elevated the shoulder 3 times on the scapular plane, in order to record 3D motion. In addition, EMG data were recorded from 5 muscles: the upper, middle, and lower trapezius, middle deltoid, and lower serratus anterior muscles. We compared with the angle of humeral external rotation and %IEMG in each 30° increment between 0 and 150°. The scapular motions of all participants were classified into 2 types: G type in 7 and S type in 7. Comparing G and S types, the angle of humeral external rotation differed at 30° of elevation, furthermore, the angle were 30.1° in G type and 24.2° in S type at 60° of elevation, and 38.6° in G type and 30.2° in S type at 90° of elevation. EMG activity at the trapezius and serratus anterior in S type was higher than those in G type between 30° and 90°.