The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Relationship between Muscle Activity and Kinematic Variables of the Upper Extremity during a Push-up Task on Stable and Unstable Surfaces

안정된 지지면과 불안정한 지지면에서 팔굽혀 펴기 시 상지 근활성도와 운동학적 변수간의 상관분석

  • Yoon, Jung-Gyu (Department of Physical Therapy, Namseoul University)
  • 윤정규 (남서울대학교 물리치료학과)
  • Received : 2011.01.11
  • Accepted : 2011.03.21
  • Published : 2011.04.25
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Abstract

Purpose: We investigated the relationship between the muscle activity and kinematic variables of the upper extremity during a push-up task on stable and unstable surfaces. Methods: We recruited 15 healthy subjects. Subjects completed the push-up task on stable and unstable surfaces. Surface electromyograms were recorded from the serratus anterior, upper trapezius, latissimus dorsi, infraspinatus to monitor changes in muscle activity. Markers for kinematic changes of elbow flexion, shoulder extension, shoulder retraction and scapular adduction were attached at C7, the T7 spinous process, both acromions, the scapula superior and inferior angle, the humerus lateral epicondyle, and the ulnar styloid process. Correlation coefficients between muscle activity and kinematic variables were analyzed by SPSS for Windows, version 15.0. Results: On the unstable surface, elbow flexion and shoulder extension increased with increasing muscle activity of serratus anterior, upper trapezius and infraspinatus. On the stable surface, shoulder retraction decreased with increasing muscle activity of serratus anterior and infraspinatus. Scapular adduction decreased with all types of increasing muscle activity, regardless of the support surface. Conclusion: Correlations between muscle activity and kinematic variables were observed on stable and unstable surfaces during a push-up task, while correlations between right and left variables were not clear. These finding suggest that it may be used to develop a rehabilitation program which could be effective in improving shoulder function in patients with shoulder problems.

Keywords

References

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