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KMID : 1101520210250020009
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Journal of Korean Society for Neurotherapy
2021 Volume.25 No. 2 p.9 ~ p.15
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The Effect of Forearm Position on the Activity of the Upper-extremity Muscles during Shoulder External Rotation Exercise using a Pulley
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Lee Gyu-Bin
Hwang Jung-Min
Lee Dong-Yeop
Yu Jae-Ho
Kim Jin-Seop
Kim Seong-Gil
Hong Ji-Heon
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Abstract
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Purpose: The Aim of this study is to determine the muscle activity of the upper extremity depending on the forearm position during the shoulder external rotation exercise.
Methods: 23 normal adult males were selected to perform shoulder external rotation exercises using three different position (supination, neutral, and pronation), while subject’s shoulder and elbow was at 0° abduction and 90° flexion, respectively. Electromyography (EMG) was attached to the infraspinatus, posterior deltoid, biceps brachii, triceps brachii, brachioradialis and extensor carpi ulnaris to observe muscle activity.
Results: With the different positions of the forearm, there was significant difference in muscle activity for the posterior deltoid, biceps brachii, brachioradialis, and extensor carpi ulnaris(p<.05). However, there were no significant difference between the infraspinatus and triceps brachii.
Conclusion: Shoulder external rotation exercise with a forearm supination position and external rotation can safely be used as efficient method for a rehabilitation of one’s shoulder.
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KEYWORD
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Pulley, Shoulder, External rotation, Forearm position, Muscle activity, EMG
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