The muscle activity of the shoulder joint muscles varies depending on the exercise posture

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  • Fukushima Hideaki
    Department of Rehabilitation, Fushimi Okamoto Hospital
  • Miura Yuichiro
    Department of Rehabilitation, Fushimi Okamoto Hospital
  • Morihara Toru
    Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine

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Other Title
  • 運動肢位の変化と肩関節周囲筋の筋活動について
  • ウンドウシイ ノ ヘンカ ト カタカンセツ シュウイキン ノ キン カツドウ ニ ツイテ

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Abstract

<p>The shoulder joint is called a complex, and consists of the sternoclavicular, acromioclavicular, scapulothoracic, and glenohumeral joints. It has a wide range of motion and contributes to the smoothness of upper limb function. The motor function of the upper limb is a complicated mechanism because the influence of the peripheral joints affects the shoulder joints, and it is difficult to understand. Electromyographic analysis of the shoulder joint function is useful for objectively presenting the effect of exercise therapy. Therefore, in this paper, we present the clinical applications of EMG data of shoulder joint function. Specifically, we focus on the following: 1) Understanding of muscle activity patterns according to the direction of movement of the shoulder joint and the elevation angle, taking into consideration the mechanism of the shoulder joint. 2) The shrug sign (shoulder shrinkage phenomenon) is a compensatory motion of shoulder joint disease cases. In addition to the activities of the elevator and retractor muscle groups of the shoulder girdle during this operation, the muscle activity of the supraspinatus muscle is also analyzed and discussed regarding its clinical applications. 3) Exercise posture (supine or lateral) promotes or suppresses treatment of the target muscles and re-education of muscle activity due to posture can be expected.</p>

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