Agonist-Antagonist EMG Ratio Method を用いた脳卒中患者の歩行分析

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Agonist-Antagonist EMG Ratio Methodを用いて，歩行周期内の前脛骨筋（tibialis anterior：TA）と下腿三頭筋（triceps　surae：TS）の活動変化をTA-TS　correlationgramとして視覚的にとらえることができた．健常者は双曲線様カーブを描き，脳卒中患者の立脚期を4群に分類した．A群：前半はTA優位からTS優位へ，後半はTA優位へ戻る．相反性抑制が保たれ健常者に近い．B群：前半は緊張性相反性抑制のためTAは変化せずTSだけが増減し，後半はTA優位へ移行する．C群：同時収縮によるTA／TS＝1に平行な動きを繰り返す．D群：TAとTSは常に高値をとり，顕著な同時収縮を示す．本法は歩行時の緊張性相反抑制や病的同時収縮の評価に有用である．The reciprocal muscular activity between the tibialis anterior (TA) and the triceps surae (TS) at a human walking cycle was visualyzed as a TA-TS correlationgram with the agonist-antagonist EMG ratio method. One of the gait cycle in normal adults exhibited the curve near a hyperbola. The other of one stride in the patients with cerebral stroke was classfied into four groups. Group-A : The locus of TA-TS correlationgram traveled from TA dominant area to TS dominant one at the first half, and it came back to TA dominant one at the second. The orbit showed a curve near that of normal adults. Group-B : TA was constant at the first , while only TS increased and decreased. The muscular activities observed a tonic reciprocal inhibition. At the second the locus went to the TA dominant area. Group-C : The locus repeatedly traveled on several line parallel to TA/TS=1 that exhibited co-contractions. Group-D : TA and TS were usually high value for rigido-spasticity. The TA-TS correlationgram with the agonist-antagonist EMG ratio method is useful for the assessment of tonic reciprocal inhibition and pathological co-contraction at a walking cycle.
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Agonist-Antagonist EMG Ratio Method を用いた脳卒中患者の歩行分析

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