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KMID : 0361420050290010050
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Journal of Korean Academy of Rehabilitation Medicine
2005 Volume.29 No. 1 p.50 ~ p.57
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Facilitation of Nerve Conduction by Distant Muscle Contraction in Stroke Patients
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Sohn Min-Kyun
Han Sang-Min
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Abstract
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Objective: To investigate the effect of distant muscle contraction on the sensory and motor nerve conduction and F-wave studies in stroke patients.
Methods: During isometric contraction of contralateral hand, sensory nerve action potential (SNAP), compound muscle action potential (CMAP) and F-wave of median nerve were recorded at submaximal and supramaximal stimulus intensity. The subject group consisted of 15 stroke patients and 10 control subjects.
Results: At submaximal stimulation, the amplitude and area of SNAP were significantly increased during muscle contraction in both groups (p <0.05). However there were no changes in parameters of SNAP and CMAP at supramaximal stimulation in both groups. The latency of F-wave was prolonged, and the amplitude was increased in the stroke group than those in the control group at resting state (p <0.05). The shortening of F-wave latency and increment of F-wave amplitude were observed in the control group during distant muscle contraction, but not in the stroke group.
Conclusion: The distant muscle contraction might facilitate the nerve conduction. In addition F-wave elicited during voluntary contraction can be used as a monitor of upper motor neuron disorders.
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KEYWORD
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Distant Muscle Contraction, Nerve conduction studies, Stroke, Facilitation
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