Malanga G A, Jenp Y N, Growney E S, An K N
Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN 55905, USA.
Med Sci Sports Exerc. 1996 Jun;28(6):661-4. doi: 10.1097/00005768-199606000-00003.
We examined the electromyographic (EMG) activity of the supraspinatus and other rotator cuff muscles, the three portions of the deltoid muscle, and the pectoralis major muscle in two previously suggested positions for isolating the supraspinatus. The position suggested by Jobe and colleagues is with the elbow extended, the shoulder in full internal rotation, and the arm in the scapular plane. Blackburn and colleagues recommended the prone position, with the elbow extended and the arm abducted to 100 degrees and externally rotated. Fine-wire EMG activity was obtained from the rotator cuff muscles and surface EMG from the other muscles in 17 subjects tested in these two positions. Both positions resulted in significant activity of the supraspinatus, but the difference between these two positions was not statistically significant. The Jobe position produced greater activation of the anterior deltoid and pectoralis major, whereas the Blackburn position caused greater activation of the posterior deltoid. Both positions produced significant activation of the middle deltoid. We conclude that either position can be used to strengthen the supraspinatus; however, neither position selectively isolates the supraspinatus during manual muscle testing.
我们在先前提出的两个用于孤立冈上肌的位置，检查了冈上肌和其他肩袖肌群、三角肌三个部分以及胸大肌的肌电图（EMG）活动。Jobe及其同事提出的位置是：肘部伸展，肩部完全内旋，手臂处于肩胛平面。Blackburn及其同事推荐俯卧位，肘部伸展，手臂外展至100度并外旋。在这两个位置对17名受试者进行测试，从肩袖肌群获取细针肌电图活动，从其他肌肉获取表面肌电图。两个位置均导致冈上肌显著活动，但这两个位置之间的差异无统计学意义。Jobe位使三角肌前部和胸大肌的激活程度更高，而Blackburn位使三角肌后部的激活程度更高。两个位置均使三角肌中部产生显著激活。我们得出结论，任何一个位置都可用于加强冈上肌；然而，在徒手肌力测试期间，没有一个位置能选择性地孤立冈上肌。
