足関節不安定性をもつスポーツ選手におけるカッティング動作の筋活動

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Ankle instability is often observed during lateral movements such as cutting movements. The purpose of this study is to examine muscle activity during cutting movements in people with mechanical instability(MI) only and in people with functional instability(FI) only. The study group consisted of 19 feet of 19 male university soccer players; those with MI only were termed "group M" and those with FI only were termed "group F." The control group consisted of 7 legs without any history of disorders of the lower limbs and was termed "group C." Leg muscle activity was measured while the subjects performed cutting movements on a foot plate. The analyses pertained to 3 phases: before the landing of the foot on the ground, during the landing of the foot on the ground, and after the landing of the foot on the ground. The relative integrated electromyographic activity(% iEMG) was determined by dividing the amount of muscle activity in each phase by the amount of muscle activity during isometric maximal voluntary contraction and was compared between the subjects. Compared to group C, group F showed a significantly higher amount of muscle activity in the peroneus longus muscle during the landing of the foot on the ground(p = 0.023), and muscle activity tended to be even higher after the landing of the foot on the ground(p = 0.066). These results suggest that in cutting movements, people with FI only try to reduce the instability by increasing the amount of muscle activity in the peroneal muscle, and that, people with MI also increase the amount of muscle activity in order to control the lateral instability.
2011-03-00

足関節不安定性をもつスポーツ選手におけるカッティング動作の筋活動

スポンサーリンク

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スポンサーリンク