Visual Biofeedback to Monitor Serratus Anterior and Upper Trapezius Muscle Activities During Arm Lowering

팔 내리기 동작 시 시각적 바이오피드백 훈련이 전거근과 상부 승모근의 근활성도에 미치는 영향

  • Ha, Sung-Min (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Min, Kyung-Jin (Dept. of Public Health, Keimyung University) ;
  • Choi, Houng-Sik (Dept. of Physical Therapy, Hanseo University)
  • 하성민 (연세대학교 대학원 재활학과) ;
  • 민경진 (계명대학교 공중보건학과) ;
  • 최홍식 (한서대학교 물리치료학과)
  • Received : 2008.02.26
  • Accepted : 2008.04.28
  • Published : 2008.05.21


To reduce winging scapula, various exercise protocols have been widely used by clinicians. Selective serratus anterior strengthening, and restoring balanced function, are especially recommended to reduce winging scapula. The purpose of this study was to investigate visual biofeedback using a real time video camera display system for monitoring scapular winging during arm lowering. For this study, 13 males with winging scapular were recruited during arm lowering. Electromyography (EMG) activity was recorded from the serratus anterior (SA) and upper trapezius (UT) of the right side and compared with normal EMG activity using a paired t-test. The study showed, through visual biofeedback, that EMG activity significantly increased in the SA and significantly decreased in the UT (p<.05). These results suggest that visual biofeedback can be recommended as an effective method for scapular eccentric control, to prevent scapular winging during arm lowering.