座位での股関節内旋・外旋角度変化が大殿筋下部線維、縫工筋、股関節内転筋の筋電図積分値に及ぼす影響

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  • 伊藤 陸
    六地蔵総合病院　リハビリテーション科 関西医療大学大学院　保健医療学研究科
  • 早田 荘
    六地蔵総合病院　リハビリテーション科
  • 藤本 将志
    六地蔵総合病院　リハビリテーション科
  • 大沼 俊博
    六地蔵総合病院　リハビリテーション科
  • 渡邊 裕文
    六地蔵総合病院　リハビリテーション科
  • 鈴木 俊明
    関西医療大学大学院　保健医療学研究科

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  • Influence of changes in hip joint internal and external rotation angles while sitting on integrated electromyography activities of the lower gluteus maximus, sartorius, and hip joint adductor muscles
  • ザイ デ ノ コカンセツ ナイセン ・ ガイセンカクド ヘンカ ガ オオトノキン カブ センイ 、 ホウコウキン 、 コカンセツ ナイテンキン ノ キンデンズ セキブンチ ニ オヨボス エイキョウ

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<p>In general, muscle action is often thought of in the anatomical limb position, and there are few reports on the complex action of the muscles surrounding the hip joint in the sitting posture. Therefore, we examined the activity of the muscles surrounding the hip joint in stable internal and external rotation using electromyography (EMG). The subjects were 10 healthy males (20 lower limbs). EMG of the lower gluteus maximus, sartorius, adductor longus, and gracilis muscles was performed in the sitting posture. The activities during internal and external rotation of the hip joint at 10°, 20°, and 30° were compared. The results show that the integrated EMG activity of the lower gluteus maximus fibers at 30° of external rotation was significantly greater than that at 10°. In addition, the integrated EMG activities of the sartorius and adductor longus muscles at 30° of external rotation were significantly greater than their respective values at 10° or 20°, and their activities at 20° of external rotation were significantly greater than their respective values at 10°. Integrated EMG activities of the adductor longus and gracilis muscles at 30° of internal rotation were significantly greater than their respective values at 10° or 20°. On the basis of these results, we conclude that external rotation of the hip joint is mainly performed by the sartorius muscle, and the lower gluteus maximus fibers supplement this action. In addition, as the hip joint adductor muscles counteract hip abduction, the adductor longus is also involved in hip joint external rotation by drawing the posterior surface of the femur inward and upward. Internal rotation of the hip joint requires adduction, so the hip joint adductor muscles are involved in stabilizing the limb position.</p>

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