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EFFECTS OF MUSCLE RELAXANT E. M. P. P. ON AFFERENT DISCHARGES OF MUSCLE SPINDLE IN MAN : AN MICRONEUROGRAPHIC ANALYSIS Tadaaki Mano 1 , Tetsu Miyaoka 2 1Department of Physiology, Hamamatsu University School of Medicine 2Department of Psychology,Hamamatsu University School of Medicine pp.237-241
Published Date 1981/3/1
DOI https://doi.org/10.11477/mf.1406204727

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  • Abstract
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Effects of a new muscle relaxant E. M. P. P. (4´- esthy1-2-methyl-3-piperidino-propiophenone・hydro-chloride) on afferent discharges of muscle spindle were studied in 10 healthy volunteer subjects. single unit afferent discharges of muscle spindlewere recorded microneurographically from the median or tibial nerve using a tungsten microele-ctrode with a tip diameter of about 1μm (im-pedence: about 10MΩ). Effects of an oral adminis-tration of 150-300mg of E. M. P. P. on spontaneous afferent discharges as well as dynamic and static responses of muscle spindle were analysed in the present study.

1. E. M. P. P. suppressed remarkably the fre-quency of spontaneous afferent discharges of muscle spindle. Meanwhile, mental activations such as speech or mental arithmetic recovered temporarily the frequency of afferent discharges to that before E. M. P. P. administration.

2. E. M. P. P. suppressed the dynamic and static responses of muscle spindle to stretch. It also suppressed the dynamic responses of muscle spindle in the decontraction phase of electrically-induced twitch contractions of the receptor-bearing muscle.

Based on these results, it is concluded that E. M. P. P. suppresses the static and dynamic activi-ties of muscle spindle in man. These effects seem to be due to modifications of descending influences from central structures on the static and dynamic gamma motoneurons which innervate the muscle spindle.


Copyright © 1981, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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