Journal of International Academy of Physical Therapy Research (국제물리치료학회지)

International Academy of Physical Therapy Research (국제물리치료연구학회)
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Effects of the Additional Scapular Posterior Tilt Movement on Selective Muscle Activation of the Lower Trapezius during Prone Shoulder Extension

  • Kim, Sooyong (Department of Physical Therapy, Pusan National University Yangsan Hospital) ;
  • Kang, Minhyeok (Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan)
  • Received : 2021.04.14
  • Accepted : 2021.06.11
  • Published : 2021.06.30
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Abstract

Background: Although the scapular posterior tilt movement could facilitate the lower trapezius (LT) muscle activity, no study identified the effects of the scapular posterior tilt movement on the selective activation of the LT muscle during prone shoulder extension. Objectives: To examine the influences of additional scapular posterior tilt on electromyography (EMG) of the upper trapezius (UT) and the LT muscles during prone shoulder extension. Design: Cross-sectional study. Methods: There were 15 asymptomatic male participants in this study who performed prone shoulder extension with and without scapular posterior tilt movements. For the scapular posterior tilt movements, participants performed visual biofeedback training for scapular movement using motion sensor. During the exercises, the EMG activity of the UT and LT was recorded using surface EMG system. Results: The EMG activity of the LT significantly increased during prone shoulder extension with scapular posterior tilt compared to that of general prone shoulder extension, whereas that of the UT was not significantly different between the two exercises. Moreover, scapular posterior tilt application significantly decreased UT/LT muscle activity ratio. Conclusion: Scapular posterior tilt movement may be emphasized during exercise when facilitating LT muscle activation.

Keywords

Acknowledgement

This paper was supported by RESEARCH FUND offered from Catholic University of Pusan.

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