《Chinese Journal of Rehabilitation Theory and Practice》 ›› 2019, Vol. 25 ›› Issue (1): 107-111.doi: 10.3969/j.issn.1006-9771.2019.01.015

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Effect of Various Movements on Shoulder External Rotators

YANG Di, ZHANG Chi, FENG Peng-peng, WANG Yang, WU Ying, SI Xiang-yue, WANG Shuo, QIAN Jing-hua   

  1. Department of Sports Medicine and Rehabilitation, Beijing Sport University, Beijing 100084, China
  • Received:2018-10-10 Revised:2018-11-29 Published:2019-01-25 Online:2019-02-18
  • Contact: QIAN Jing-hua. E-mail: jh5727@163.com
  • Supported by:
    Fundamental Research Funds for the Central Universities (No. 2016YB038)

Abstract: Objective To investigate the activities of infraspinatus (IS) and posterior deltoid (PD) under shoulder external rotation at open kinetic chain (OKC) and closed kinetic chain (CKC) exercise with shoulder abduction 0° and 90° to determine the optimal external rotation rehabilitation exercise.
Methods From April to June, 2018, 19 healthy adults finished the movement of 0° OKC, 0° CKC, 90° OKC and 90° CKC. The root mean square (RMS) of IS and PD was recorded with surface electromyography (sEMG), then the standardized RMS (RMS%), ratio of IS/PD and onset time of activation were calculated.
Results RMS% of PD was the minimal at 90° CKC, and was less than that of 0° CKC (P < 0.05). IS/PD was the most at 90° CKC, and was more than that of 90° OKC (P < 0.05). The onset time of IS was the earliest in 90° CKC, and earlier than that of 90° OKC (P < 0.05) and 0°OKC (P < 0.05). The onset time of PD was the latest in 0° CKC, and latter than that of 90° OKC (P < 0.05).
Conclusion 90°CKC activates IS mostly and earliest, which can be used in early rehabilitation for rotator cuff injury.

Key words: rotator cuff injury, infraspinatus, posterior deltoid, open kinetic chain exercises, closed kinetic chain exercises, surface electromyography

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