Facilitation of Nerve Action Potential by Distant Muscle Contraction.
- Author:
Min Kyun SOHN
1
;
Bong Ok KIM
;
Sang Min HAN
;
Kwon Hong MIN
Author Information
1. Department of Rehabilitation Medicine, Chungnam National University College of Medicine, Korea. rm53hsm@hanmail.net
- Publication Type:Original Article
- Keywords:
Distant muscle contraction;
Nerve conduction studies;
F-waves;
Facilitation
- MeSH:
Action Potentials*;
Adult;
Hand;
Humans;
Isometric Contraction;
Lower Extremity;
Median Nerve;
Muscle Contraction*;
Neural Conduction;
Sural Nerve;
Tibial Nerve
- From:Journal of the Korean Academy of Rehabilitation Medicine
2004;28(1):48-53
- CountryRepublic of Korea
- Language:Korean
-
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.
