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Journal of the Korean Academy of Rehabilitation Medicine 2001;25(5):766-775.
The Neurophysiologic Response of Anterior Horn Cell Activity to Paraspinal Electrical Stimulation.
Shin, Hye Sung , Han, Soo Jung , Cheong, Jee Young , Lee, Chyung Ki
Department of Rehabilitation Medicine, Ewha Womans University College of Medicine.
척수 주변부 전기자극에 의한 척수전각세포 활동도의 신경생리학적 변화
신혜성, 한수정, 정지영, 이청기
이화여자대학교 의과대학 재활의학교실
Abstract

Objective
This study was proposed to evaluate the electrophysiologic changes in central motor conduction and in silent period (SP) after paraspinal transcutaneous electrical stimulation near caudal area of the spinal cord.


Method
Conditioning stimulation was applied to T12 paraspinal area for 20 minutes using interferential current therapy (80∼100 Hz) in 11 healthy subjects. The amplitude and latency of central motor conduction and duration of SP were measured in motor evoked potential (MEPs) by using magnetic stimulator, before and after the conditioning stimulation. These variables were recorded in both tibialis anterior muscle, innervated from stimulated spinal area, and both abductor pollicis brevis, innervated from cervical cord not directly stimulated by electrical stimulation.


Results
After conditioning stimulation, the amplitudes of central motor conduction decreased (p<0.01), and the latencies did not change in both cervical and lumbar muscles in transcranial and spinal MEP studies, and the duration of SP was decreased in same manner (p<0.01).


Conclusion
These results mean that the excitability of anterior horn cells decreases and the supraspinal inhibitory mechanism of the central motor conduction is suppressed by a certain conditioned electrical cutaneous stimulation in entire spinal cord.

Key Words: Electrical stimulation, Motor evoked potential, Silent period, Spinal cord


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