Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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Effects of Passive Scapular Alignment on Electromyographic Activity of Trapezius in People With Shortness of Pectoralis Minor Muscle

수동적 어깨뼈 정렬이 작은가슴근 단축된 사람의 등세모근 근활성도에 미치는 영향

  • Choi, Ji-Young (Dept. of Physical Therapy, The Graduate School, Inje University) ;
  • Jang, Jun-Hyeok (Dept. of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine) ;
  • Oh, Jae-Seop (Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University)
  • 최지영 (인제대학교 대학원 물리치료학과) ;
  • 장준혁 (해운대 자생한방병원 물리치료실) ;
  • 오재섭 (인제대학교 의생명공학대학 물리치료학과)
  • Received : 2012.04.09
  • Accepted : 2012.04.30
  • Published : 2012.05.21
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Abstract

The purpose of this study was to assess the influence of scapular alignment on the electromyographic (EMG) activity of the trapezius in people with a short pectoralis minor muscle. For the study, we recruited 15 volunteers who had positive results for short on a pectoralis minor muscle length test. We measured the EMG activity of the upper, middle and lower trapezius muscles. The participants lifted their dominant arm to ear level with the thumb up toward the ceiling in the prone position on a table with the shoulder at a flexion angle of 180 degrees and a horizontal abduction angle of 120 degrees. Scapula was manually aligned by an experienced physical therapist prior to arm lift for the scapular alignment condition. A paired t-test was used to compare the effects of scapular alignment on the EMG activity of the trapezius muscles. The EMG activity of the lower trapezius muscle was significantly increased during the test with the scapular alignment compared to that without scapular alignment (p<.05), while the upper trapezius and middle trapezius exhibited no significant difference between the two conditions (p>.05). The findings of this study suggest that a scapular alignment may alter the recruitment of the lower trapezius muscle during arm lifting in the prone position in people with a short pectoralis minor muscle.

Keywords

References

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