骨盤前傾および後傾座位での傾斜反応における内腹斜筋，多裂筋の筋活動の変化

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  • Changes in the Activity of the Internal Abdominal Oblique and Multifidus Muscles during Forward and Backward Pelvic Tilting in Different Seated Positions

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〔目的〕本研究は，骨盤前傾および後傾座位での傾斜反応における内腹斜筋，多裂筋の筋活動の変化について検討した．〔対象〕健常成人男性8 名，平均年齢28.4 ± 3.2 歳であった．〔方法〕骨盤前傾および後傾座位にて右側方傾斜時の左右の内腹斜筋，多裂筋の筋電図積分値を測定し，安静時の筋電図積分値を100% として比較を行った．〔結果〕筋電図積分相対値は，骨盤後傾座位では有意差を示さなかったが，骨盤前傾座位において右内腹斜筋は，10°右側方傾斜時と比べ20°右側方傾斜時に有意に増加した．左内腹斜筋は，安静時に比べ10°右側方傾斜時に有意に増加した．右多裂筋は，有意差がなかったが，左多裂筋は安静時に比べて10°右側方傾斜，20°右側方傾斜で有意に増加した．〔結論〕座位で体幹筋群の筋活動を高める傾斜反応の誘導は，骨盤前傾座位にて誘導することが重要であることが示された．

Purpose：We investigated the activity of the internal abdominal oblique and multifidus muscles during forward and backward pelvic tilting in different seated positions. Subjects：The study included 8 young males（ mean age, 28.4 ± 3.2 years）. Methods：We obtained the integral values of electromyography signals for the right and left internal abdominal oblique and multifidus muscles when the body was seated at rest and titled to the right in the forward and backward pelvic tilting positions. Results：All integral values for both muscles did not show any significant differences when obtained during backward pelvic tilting. With regard to the forward pelvic tilting position, the values for the right internal abdominal oblique muscle were significantly higher during right-sided tilting at 20° than during right-sided tilting at 10°. The values for the left internal abdominal oblique muscle were significantly higher during right-sided tilting at 10° than at rest.Although the values for the right multifidus muscle were not significantly different between positions, those for the left multifidus muscle were significantly higher during right-sided tiltingat 10° and 20° than at rest. Conclusion：The results indicate that guidance during forward pelvic tilting is important increasing the activity of trunk muscles in the seated position.

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