Effects of afferent stimulation rate on inhibitory spinal pathways in hemiplegic spastic patients

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• 作者：N. Roche^a ; ^b ; V. Achache^a ; A. Lackmy^a ; P. Pradat-Diehl^a ; ^c ; J.C. Lamy^d ; R. Katz^a ; ^c ; ^{rose.katz@upmc.fr}
• 关键词：H reflex ; Hemiplegic patients ; Spinal networks ; Stimulation rate ; Spasticity
• 刊名：Clinical Neurophysiology
• 出版年：2012
• 期刊代码：61_13882457
• 类别：med
• 出版时间：July, 2012
• 卷：123
• 期：7
• 页码：1391-1402
• 文件大小：1031 K

摘要

Objective

It has recently been demonstrated in the cat and in healthy subjects that the effects of repetitive afferent fibre stimulation depends on the target spinal neurones. The purpose of this series of experiments was therefore to determine whether central nervous system lesions modify the behaviour of the inhibitory spinal pathways in response to repetitive activation of afferent fibres.

Methods

The H-reflex technique was used to study the effect of increasing the conditioning stimulus rate from 0.16 to 1 Hz on disynaptic inhibition and on presynaptic Ia inhibition on the affected side of 36 hemiplegic patients.

Results

The major finding was that, similar to results previously obtained in healthy subjects, increasing the conditioning stimulus rate in hemiplegic patients leads to an increase in the synaptic efficiency of inhibitory spinal circuits. Furthermore, a significant correlation was found between the severity of flexor carpi radialis muscle spasticity and the amount of disynaptic inhibition.

Conclusions

The reinforcement of inhibitory spinal networks induced by repetitive stimulation of afferent fibres is preserved in spastic patients, whereas the mechanisms underlying this phenomena might be altered.

Significance

The results of these experiments open up a number of possibilities for novel spasticity therapies based on non-invasive techniques.