Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Effect of Trunk Flexion on Muscle Activity, Motion of Scapular and Scapulohumeral Rhythm

몸통 굽힘이 어깨위팔리듬과 어깨뼈의 움직임 및 근육 활성도에 미치는 영향

  • Park, Seung-Kyu (Department of Physical Therapy, College of Health, Daebul University) ;
  • Han, Song-E (Department of Physical Therapy, Graduate School of Daebul University) ;
  • Kang, Jeong-Il (Department of Physical Therapy, College of Health, Daebul University) ;
  • Lee, Joon-Hee (Department of Physical Therapy, College of Health, Daebul University) ;
  • Yang, Dae-Jung (Department of Physical Therapy, College of Health, Daebul University)
  • 박승규 (대불대학교 보건대학 물리치료학과) ;
  • 한송이 (대불대학교 대학원 물리치료학과) ;
  • 강정일 (대불대학교 보건대학 물리치료학과) ;
  • 이준희 (대불대학교 보건대학 물리치료학과) ;
  • 양대중 (대불대학교 보건대학 물리치료학과)
  • Received : 2010.10.31
  • Accepted : 2010.12.30
  • Published : 2011.06.30
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Abstract

The purpose of this study was to determine the effect of trunk posture on muscle activity and motion of scapular and scapulohumeral rhythm. Thirty-one healthy subjects performed right-arm abduction and adduction along the frontal plane while standing in both upright and flexed posture of trunk. Scapular upward rotation, anterior tilting and internal rotation ware recorded using a motion analysis system and muscle activity of upper trapezius, lower trapezius and serratus anterior ware recorded using surface electromyography during abduction and adduction in both trunk postures. then, scapulohumeral rhythm was calculated. Scapulohumeral rhythm and scapular posterior tilting in flexed posture was significantly decreased than in upright posture. Also, muscle activity of lower trapezius in flexed posture was significantly increased and serratus anterior was significantly decreased than in general posture. The result of this study revealed that flexed posture of trunk altered the muscle activity and kinematic of scapular. Measurement of trunk posture should be included the evaluation of dysfunction and disorder of shoulder girdle since rehabilitation of trunk posture is important to restore of upper limbs function.

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References

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