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Journal of the Korean Academy of Rehabilitation Medicine 2003;27(3):410-417.
The Optimal Electrical Stimulation Frequency to Improve the Muscle Endurance in Spinal Cord Injured Rabbit.
Han, Tai Ryoon , Bang, Moon Suk , Chung, Sun Gun , Jeon, Jae Yong , Kim, Sang Jun , Lee, Ho Jun
1Department of Rehabilitation Medicine, Seoul National University College of Medicine, Korea.
2Department of Rehabilitation Medicine, Dongguk University College of Medicine, Korea. jyjeon@medigate.net
척수손상 가토에서의 근 지구력 향상을 위한 전기 자극 시 적정 주파수
한태륜, 방문석, 정선근, 전재용1, 김상준, 이호준
서울대학교 의과대학 재활의학교실, 1동국대학교 의과대학 재활의학교실
Abstract
Objective
Clinical application of Functional Electrical Stimulation (FES) was limited due to the muscle fatigue phenomenon. This study was undertaken to find an electrical stimulation frequency, which optimally improves muscle endurance in spinal cord injured rabbit.


Method
Fifteen rabbits were experimentally spinal cord injured at the T10 or T11 spinal cord level. Three kinds of stimulation frequency (10, 20, 40 Hz) and sham control stimulation were applied to the tibialis anterior muscle of each four group for 1 hour per day, for 2 weeks. Muscle fatigue index and peak torque were measured during electrical stimulation, and proportion of the type I muscle fiber was measured at ATPase (pH 9.4) staining.


Results
Complete paraplegia was obtained in all 12 rabbits. Muscle fatigue index and peak torque were not changed after 2 weeks of electrical stimulation in all four groups. The proportion of the type I muscle fiber was reduced in all four groups after 2 weeks. However, 40 Hz stimulation group showed less decline in proportion of type I muscle fiber than control or 10 Hz group.


Conclusion
High frequency electrical stimulation applied at an early stage of spinal cord injury is more effective in preserving muscle endurance than low frequency stimulation. (J Korean Acad Rehab Med 2003; 27: 410-417)

Key Words: Spinal cord injury (SCI), Functional electrical stimulation (FES), Frequency, Muscle endurance


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