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Journal of the Korean Academy of Rehabilitation Medicine 1996;20(3):7.
Stimulus Parameters of Functional Electrical Stimulation in Atrophied Muscles Following Spinal Cord Injury
박병림1, 김민선1, 이문영1, 박동식1,*, 박형준**, 강곤*** Byung Rim Park, M.D.1, Min Sun Kim, M.D.1, Moon Young Lee, M.D.1, Dong-Sik Park, M.D.1,*, Hyung Jun Park, Ph.D.** and Gon Khang, Ph.D.***
Departments of Physiology and *Rehabilitation Medicine, Wonkwang University School of Medicine, and 1Medicinal Resources Research Center of Wonkwang University, **Department of Electrical Engineering, Wonkwang University, ***Department ofBiomed
척수손상 후 위축된 하지근에서 기능적 전기자극을 위한 자극조건
원광대학교 의과대학 생리학교실, *재활의학교실, **원광대학교 공과대학 전기공학과, 1원광대학교 의약자원 연구센터, ***건국대학교 의과대학 의공학과
Abstract

Optimal stimulus parameters in functional electrical stimulation, which can minimize muscle fatigue and can achieve effective muscle contraction were determined to restore the motor function in atrophied muscles caused by central nervous system injury. Fatigue index of muscle contraction was measured from 2 min of tetanic contraction in T6 spinal cord injured Sprague-Dawley rats.

In control rats, the soleus muscle was classified into slow muscle and the medial gastrocnemius muscle was fast muscle according to their mechanical property of contraction. Optimal parameters of electrical stimulation for slow muscle were 20Hz, 0.2ms square pulse. For fast muscle, 40Hz, 0.3ms square pulse was optimal to reduce muscle fatigue. The atrophied soleus and medial gastrocnemius muscles by spinal cord injury showed significantly decreased muscle weight and tension, however, optimal parameters of electrical stimulation were the same as those of control rats. All of these findings suggest that optimal parameters in electrical stimulation which restore the motor function of atrophied muscle should be 20Hz, 0.2ms in slow muscle and 40Hz, 0.3ms in fast muscle.

Key Words: Stimulus parameter, Functional electrical stimulation, Atrophied muscle, Slow muscle, Fast muscle


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