自転車駆動中の下部体幹筋活動と脊椎運動

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Trunk motion and the mechanisms of postural control during pedaling was investigated by analyzing the lower trunk muscle activity and spinal motion. Eight healthy adult men were assigned to pedal at the rate of 60 cycles per min. with the load of 100W, 150W and 200W. Muscle activity was recorded with the surface electrodes from the m.multifidus, m.iliocostalis, m.obliquus externus, m; rectus abdominis, m.rectus femoris, m.adductor longus and m.semitendinosus. Spinal motion was filmed with 8mm video camera located 5m behind the subject and 1m above the floor, and five markers were attached on the midline of the spine(C7, Th6, Th12, S1, Co). Muscle activity(iEMG)was quantified by integrating one cycle of recorded electromyogram, and significant increase was recognized in the trunk muscles and m.rectus femoris as the load increased. The angles between each segments were calculated and the largest deviation was observed in the lumbo-sacral portion. Focussing on the activity of the m.obliquus externus, four patterns of controling the trunk posture were observed, and as the load increased, the activity patterns changed in foursubjects and the other four showed tremendous increase in iEMG without changing the pattern. The results sugest that the pedaling may cause relatively large motion at lambo-sacral portion of the spine, and either the change in the activity pattern or the increase in the activity level of the trunk muscles, such as m.obliquus externus, should contribute to reduce the stress on the lanbo-sacral portion.
日本体力医学会の論文
1996-08-01

自転車駆動中の下部体幹筋活動と脊椎運動

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