The Relationship between the Angle of Shoulder Elevation and EMG Activities of Subscapularis Muscle

DOI IR 17 References
  • NAKAYAMA Hiroko
    Department of Rehabilitation, Niigata Central Hospital Department of Physical Therapy, Niigata University of Health and Welfare Graduate School
  • ONISHI Hideaki
    Department of Physical Therapy, Niigata University of Health and Welfare Graduate School
  • NAKABAYASHI Miyoko
    Department of Physical Therapy, Niigata University of Health and Welfare Graduate School Department of Rehabilitation, Niigata Prefectural Hamagumi Rehabilitation for Children with Disabilities
  • OYAMA Mineo
    Department of Occupational Therapy, Niigata University of Health and Welfare Graduate School
  • ISHIKAWA Tomoji
    Department of Health and Sports, Niigata University of Health and Welfare Graduate School

Bibliographic Information

Other Title
  • 肩関節挙上角度と肩甲下筋の筋活動の関係

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Description

The purpose of this study was to investigate the functional difference of upper, middle and lower portions of subscapularis muscle. The electromyography (EMG) activities were detected using fine-wire electrode and were recorded from upper, middle and lower parts of the subscapularis. Six subjects with no previous history of shoulder injury were evaluated in this study. Each subject performed maximum isometric internal rotation in 21 positions (abduction at 0°, 60°, 120°, flexion at 60°, 120°, scapular elevation at 60°, 120°, at three degrees of Numeral rotation, internal rotation at 45°, midposition of roration and external rotation at 45°) using BIODEX system 3 for 5 sec. Integrated EMG activites (%IEMG) of internal rotation ware normalized with the humerus in 0° abduction and midposition of rotation. The results demonstrated that peak torque value at 120° scapular elevation and abduction in midposition of roration was statistically significant lower than elevation at 0° and 60°. In the abduction in midposition of roration, the %IEMG value in the upper parts of subscapularis at 0° was higher than at 60° and 120°. In the scapular elevation in midposition of roration, the middle parts of the subscapularis at 60° was higher than at 0° and 120°, in the lower part of subscapularis was higher at 120° than at 0° and 60°. These findings suggest that maximal activation of 3 portions of subscapularis during internal rotation depend to the angle of humeral axis to be perpendicular to each portion of subscapularis muscle.

Journal

  • Physical Therapy Japan

    Physical Therapy Japan 35 (6), 292-298, 2008-10-20

    Japanese Society of Physical Therapy

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