| Facilitation of Nerve Action Potential by Distant Muscle Contraction. |
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Sohn, Min Kyun , Kim, Bong Ok , Han, Sang Min , Min, Kwon Hong |
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Department of Rehabilitation Medicine, Chungnam National University College of Medicine, Korea. rm53hsm@hanmail.net |
| 원거리 근 수축에 의한 신경활동전위의 촉통 |
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손민균, 김봉옥, 한상민, 민권홍 |
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충남대학교 의과대학 재활의학교실 |
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| Abstract |
Objective
To investigate the effect of distant muscle contraction on the sensory and motor nerve conduction and F-wave studies.
Method
During isometric contraction (10%, 25% and 50% of maximal voluntary contraction) of dominant hand using hand held dynamometer, sensory nerve action potentials (SNAPs), compound muscle action potentials (CMAPs) and F-waves were examined on contralateral upper and ipsilateral lower extremities in 20 healthy adult subjects. SNAPs of median and sural nerves, CMAPs and F-waves of median and tibial nerves were recorded with submaximal and supramaximal intensity stimulation.
Results
At submaximal stimulation the amplitudes and areas of median and sural SNAPs and median nerve CMAPs were significantly increased during distant muscle contraction (p＜0.05). Distant muscle contraction did not effect on the parameters of SNAPs and CMAPs at supramaximal stimulation. The latencies of F-waves were significantly shortened and amplitudes of F-waves were increased during distant muscle contraction (p＜0.05). Especially the amplitudes of F-waves were significantly positive correlated with the level of muscle contraction (p＜0.05).
Conclusion
SNAPs and CMAP were augmented by the distant muscle contraction only submaximal stimulation. Due to facilitation, the distant muscle contraction should be considered during routine F-wave studies. (J Korean Acad Rehab Med 2004; 28: 48-53) |
| Key Words:
Distant muscle contraction, Nerve conduction studies, F-waves, Facilitation |
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