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KMID : 1034620180080010027
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Korean Journal of Neuromuscular Rehabilitation
2018 Volume.8 No. 1 p.27 ~ p.34
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Effects of the Shoulder Stabilizer Muscle Activity During a Modified Push up Plus Exercise According to Glenohumeral Joint Rotation
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An Ji-Hun
Choung Sung-Dae
Shim Jae-Hun
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Abstract
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The purpose of this study is to find the effects of compare the shoulder stability muscle activity during a modified push up plus exercise according to glenohumeral joint rotation in healthy subjects by surface electromyographic (EMG) activities of the upper trapezius (UT), pectoralis major (PM), and serratus anterior (SA). Twenty-seven healthy young subjects (male - 15, Female - 12) voluntarily participated in this study. Subjects performed modified push up plus exercise on glenohumeral joint rotation (external rotation 0°, 45°, 90°, 110°). Modified push up plus exercise is designed to control the glenohumeral joint rotation angle more than standard push up plus exercise. Surface EMG was recorded from the UP, PM, and SA muscles. All measurement and progress were performed equally. Dependent variables were examined by repeated measurement of ANOVA with a statistical significance level of α= .05. In the result of the study, upper trapezius between the glenohumaral joint rotation were significantly change in 45° and 110° (p<.05), 90° and 110° (p<.05). pectoralis major between the glenohumaral joint rotation were significantly change in 45° and 110° (p<,05), 90° and 110° (p<.05). serratus anterior between the glenohumaral joint rotation were significantly change in all degree (p<.05). The upper trapezius showed greater mean muscle activation on 110° of glenohumeral joint rotation (Lower mean muscle activation on 90°). The pectoralis major showed greater mean muscle activation on 110° of glenohumeral joint rotation (lower mean muscle activation on 45°). The serratus anterior showed greater mean muscle activation on 110° of glenohumeral joint rotation (lower mean muscle activation on 0°). These results showed that the modified push up plus exercise is effective to selectively strengthen the shoulder stability muscles.
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KEYWORD
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Glenohumeral joint, Modified push up plus exercise, Muscle activity, Shoulder stability muscle
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