Journal of The Korean Society of Integrative Medicine (대한통합의학회지)

Korean Society of Integrative Medicine (대한통합의학회)
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The Study of Participation Ratio on Shoulder Abductor Muscle Activities According to Shoulder Abduction Angle

어깨관절벌림 각도에 따른 어깨주변 근육들의 참여 비율에 대한 연구

  • Park, Minchull (Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan) ;
  • Lee, Sangyeol (Department of Physical Therapy, College of Science, Kyungsung University)
  • 박민철 (부산가톨릭대학교 보건과학대학 물리치료학과) ;
  • 이상열 (경성대학교 이과대학 물리치료학과)
  • Received : 2017.04.10
  • Accepted : 2017.05.01
  • Published : 2017.06.30
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Abstract

Purpose: The purpose of this study was to determine the muscle activity ratio according to the shoulder abduction angle by identifying the mean muscle activities and calculating the muscle ratios for use in developing strengthening methods. Methods: The participants were healthy adults in their 20s (n=19). The activity of the deltoid middle, upper trapezius, middle trapezius, and lower trapezius muscles was measured by 8-channel surface electromyography. Muscle activity was measured during 4 conditions of angle of shoulder abduction: $30^{\circ}$, $60^{\circ}$, $90^{\circ}$, and $120^{\circ}$. The data used in the analysis were the root mean square and % total muscle activity values. Results: The root mean square values for the deltoid middle, upper trapezius, middle trapezius, and lower trapezius muscles showed significant differences. No significant differences were detected in the % total muscle activity of the deltoid middle, upper trapezius, middle trapezius, or lower trapezius muscles. Conclusion: Future studies aimed at developing selective shoulder abductor muscle strengthening methods are likely to provide more effective results by using muscle activity ratios.

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References

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