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Journal of the Korean Academy of Rehabilitation Medicine 2002;26(2):140-146.
Effect of Voluntary Contraction in Motor Evoked Potential and Silent Period by Transcranial Magnetic Stimulation.
Lee, Kyung Ah , Youn, Tae Sik , Choi, Ok Chae , Lee, Sang Ji
Department of Rehabilitation Medicine, Ewha Womans University College of Medicine, Korea. isemka@hanmail.net
자기자극 검사에서 근수축력이 운동유발전위와 정지기에 미치는 영향
이경아, 윤태식, 최옥채, 이상지
이화여자대학교 의과대학 재활의학교실
Abstract

Objective
To determine the effects of the voluntary contraction of muscles and magnetic stimulation intensity on the motor evoked potential (MEP) and the silent period (SP).


Method
We studied MEPs and SPs in opponens pollicis muscle in 30 healthy adults (male: 16, female: 14) while varying the amount of the voluntary contraction and the stimulation intensity. We analyzed MEPs and SPs in relation to sex, recording site, opposition power and height.


Results
1) During the contraction, the latencies of MEP were significantly shorter than during the relaxation. 2) The amplitudes of MEP reached plateau at 30% of maximal voluntary

contraction and increased with increment of stimulation intensity without limitation. The amplitudes of MEP of right hand were bigger than left hand. There were no significant differences according to sex and recording site. 3) The durations of SP were directly proportional to the degrees of voluntary contraction and the stimulation intensity.


Conclusion
Transcranial magnetic stimulation should be performed under the same voluntary contraction and magnetic stimulation intensity. (J Korean Acad Rehab Med 2002; 26: 140-146)

Key Words: Transcranial magnetic stimulation, Motor evoked potential (MEP), Silent period (SP), Voluntary contraction


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