대한물리의학회지 (Journal of the Korean Society of Physical Medicine)

  • 제14권2호
  • /
  • Pages.1-7
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  • 2019
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  • 1975-311X(pISSN)
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  • 2287-7215(eISSN)
대한물리의학회 (The Korean Society of Physical Medicine)
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Comparison of the Effects of Different Adduction Loads on EMG Activities of Selected Shoulder Muscles During Shoulder External Rotation Exercise in Healthy Young People

  • Peng, Cheng (Department of Rehabilitation Sciences, Graduate School, Daegu University) ;
  • Bae, Chang-Hwan (Bae Chang Hwan Training Center) ;
  • Choi, Eun-Hong (Department of Rehabilitation Sciences, Graduate School, Daegu University) ;
  • Kim, Myoung-Kwon (Department of Physical Therapy, College of Rehabilitation Sciences, Daegu University)
  • 투고 : 2018.11.03
  • 심사 : 2019.03.06
  • 발행 : 2019.05.31
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초록

PURPOSE: This study was conducted to investigate effects of shoulder adduction load on rotator cuff muscles, including the infraspinatus, during the external rotation exercise of shoulder. METHODS: This study investigated 16 healthy university students from Daegu University. Before the study started, all participants understood the content of this study. They signed an informed consent form. Five electrodes for surface electromyography (sEMG) were attached to their infraspinatus, middle deltoid, posterior deltoid, upper trapezius and pectoralis major. The participants then underwent the shoulder external rotation exercise with the shoulder adduction at three loads (0 mmHg, 20 mmHg and 40 mmHg) that were controlled using a stabilizer Pressure $Bio-feedback^{TM}$ device. The surface electrodes recorded the electromyographic data during the external rotation exercise of shoulder. RESULTS: The infraspinatus was most activated when the shoulder adduction pressure was 40 mmHg during the external rotation exercise of shoulder. The infraspinatus activation significantly increased when the shoulder adduction pressure intensity increased, while the middle deltoid activation and the posterior deltoid activation significantly decreased (p<.05). CONCLUSION: In conclusion, increases in shoulder adduction load intensity during shoulder external rotation exercises can have a positive effect on the infraspinatus, which consists of rotator cuff muscles, with minimal activity in the middle and posterior deltoid.

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참고문헌

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