ILIOPSOAS MUSCLE ACTIVITIES IN HEMIPLEGIC GAIT

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From the observation of time factor in hemiplegic gait, it was thought that the improvement of the gait speed might be dependent on the shortening of the stance phase of gait cycle, especially on the double accelerating stance period. Two structures were thought to have important roles for this period ; they were the role of anti-gravity muscles of the lower limb that represents the knee extension mechanism, and the role of the iliopsoas muscle that initiates swing of the lower limb. From EMG study of hemiplegic gait, followings were revealed1) Iliopsoas muscle showed phasic activity like the control group through the walking cycle, so that this muscle may not concern with prolongation of double accelerating period seen in hemiplegic gait.2) Gluteus medius, vastus lateralis, medial hamstrings showed dynamic muscle activities contributing to coordinative lower limb motion in normal walking cycle. In hemiplegic gait, their abnormal inappropriate activities in this period were thought as a factor that prolongs double accelerating period.3) Triceps surae was also thought as a factor of prolonged double accelerating period, disturbing optimal knee and hip flexion due to lack of dynamic discharge.4) Improving the double accelerating period or the walking capability in hemiplegic patients, supporting system of the lower limb must be focused rather than inappropriate iliopsoas activity which was hypothesized at the beginning of this research.