일어서기 동작시 편마비 환자의 보행 속도에 따른 체간과 하지 근 활성 형태의 비대칭성에 관한 연구

Study on Asymmetrical EMG Activation Pattern of Selected Trunk and Thigh Muscles on Gait Velocity of Individuals With Post-Stroke Hemiparesis During Sit-to-Stand Movement

This study aimed to identify the asymmetry observed in the electromyography (EMG) activity patterns of selected trunk and thigh muscles between the affected and unaffected sides during the sit-to-stand movement in ambulatory patients with post-stroke hemiparesis. TI1is study included 20 patients with post-stroke hemiparesis. The differences between stroke fast. walkers (≥8 ㎧, 11 subjects) and stroke slow walkers (＜8 ㎧, 9 subjects) were compared. The activation magnitude and onset time of the multifidus, lumbar erector spinae, hamstrings, and quadriceps during the sit-to-stand movement were recorded through surface EMG. Moreover, the EMG activation magnitude and onset time ratios of each bilateral corresponding muscle from the trunk and leg were measured by chiding the relevant values of the unaffected side by those of the affected side. In all the subjects, the activation magnitudes of the multifidus, hamstring, and quadriceps on the affected side significantly decreased compared to those on the unaffected side (p＜.05). The onset lime of muscle activity in the affected side was markedly delayed for the multifidus and quadriceps during the task (p＜.05). The activation magnitude ratios of the quadriceps were markedly decreased in the stroke slow walkers as compared to those in the stroke fast walkers. These findings indicate that the asymmetry in the multifidus, hamstring, and quadriceps muscle activation patterns in patients with post-stroke hemiparesis may be due to the excessive muscle activation in the unaffected side to compensate for the weakened muscle activity in the affected side. Our findings may provide researchers and clinicians with information that can be useful in rehabilitation therapy.