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Journal of the Korean Academy of Rehabilitation Medicine 1991;15(3):278-286.
Magnetic stimulation of motor cortex and spinal motor root.
Sohn, Min Kyun , Moon, Jae Ho , Song, Ju Won , Park, Dong Sik
Department of Rehabilitation Medicine, Yonsei University College of Medicine
자기자극에 의한 운동유발전위에 대한 연구
손민균, 문재호, 송주원, 박동식
연세대학교 의과대학 재활의학교실
Abstract

Magnetic stimulation of the motor system is a new painless, noninvasive neurophysiologic technique enabling examination of the central motor pathways in awake persons.

Fifty five healthy adults were studied.

The mean central motor conduction time w as 5.82 ± 0.67 msec, 6.31 ± 0.39 msec, 6.81 ± 0.61 msec and 13.53 ± 1.52 msec when recording from biceps brachii, extensor digitorum brevis, abductor digiti quinti and tibialis anterior respectively and all those showed no significant difference in both side.

The onset latencies obtained by magnetic root stimulation were always shorter than the peripheral motor conduction time estimated by F-wave study, and the difference is 0.78 ± 0.67 msec in the abductor digiti quinti and 3.01 ± 1.05 msec in the tibialis anterior. And motor evoked potential was not elicited in the tibialis anterior muscle by cervical stimulation. Therefore the origin of the responses in the sine was due to excitation of the peripheral nerves or roots and not spinal cord.

With increment of height, the mean latencies of motor evoked potentials become significantly prolonged (p<0.01), but central motor conduction time showed no change.

Key Words: Magnetic stimulation, Motor evoked potential, Central motor conduction time


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