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http://dx.doi.org/10.15268/ksim.2019.7.3.109

Comparison of Muscle Activity around the Scapulothoracic Muscles According to the Angle of Shoulder Joint Abduction in the Prone Position  

Park, Heeyong (Dept. of Physical Therapy, Joongbu University)
Cha, Hyungyu (Dept. of Physical Therapy, Joongbu University)
Publication Information
Journal of The Korean Society of Integrative Medicine / v.7, no.3, 2019 , pp. 109-115 More about this Journal
Abstract
Purpose : The purpose of this study was to investigate the activity of muscles around the scapulothoracic muscles according to the angle of shoulder joint abduction in the prone position. Methods : The participants included 15 adult males who had not undergone orthopedic surgery and did not have shoulder joint impairments. We measured the muscle activity of the upper trapezius, middle trapezius, lower trapezius, and serratus anterior at $120^{\circ}$, $90^{\circ}$, and $60^{\circ}$ shoulder joint abduction angles. Results : There was a significant difference in the comparison of muscle activity in the upper trapezius, middle trapezius, and serratus anterior muscles according to the shoulder joint abduction angle (p<.05). The results of the post test showed that the upper trapezius was significantly different between $120^{\circ}$ and $60^{\circ}$ (p<.01), and the middle trapezius was significantly different between $90^{\circ}$ and $120^{\circ}$, and between $90^{\circ}$ and $60^{\circ}$ (p<.05). There was a significant difference in the serratus anterior between $120^{\circ}$ and $90^{\circ}$ (p<.01), and $120^{\circ}$ and $60^{\circ}$ (p<.01). Conclusion : The results of this study could be used to determine an effective shoulder joint abduction angle to reduce muscle activity of the upper trapezius and increase muscle activity of the middle trapezius, lower trapezius, and serratus anterior.
Keywords
EMG; lower trapezius; scapulothoracic joint; shoulder angle; upper trapezius;
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