Coupling between single muscle spindle afferent and EMG in human wrist extensor muscles: physiological evidence of skeletofusimotor (beta) innervation

Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control Pub Date : 1998-08-01 DOI:10.1016/S0924-980X(98)00030-7

Naoyuki Kakuda, Takako Miwa, Masanori Nagaoka

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引用次数: 21

Abstract

Objectives: This study was conducted to find physiological evidence of skeletofusimotor innervation in man. Methods: Discharges of 38 single muscle spindle afferents from m. extensor carpi radialis were recorded from 9 subjects during steady isometric contractions of wrist extension. Correlation between these afferents and rectified surface EMG was investigated by estimating cumulant density function. Results: In the cumulant density estimate between spindle afferent and EMG, a positive EMG peak was obtained prior to afferent firing between −30 and −10 ms in 15 afferents (39%). Conclusions: The present finding indicates coupling between spindle afferents and extrafusal activity and suggests the widespread skeletofusimotor innervation in human muscle spindle.

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腕部伸肌单肌纺锤体传入与肌电图的耦合:骨融合运动(β)神经支配的生理证据

目的:本研究旨在寻找人体骨骼融合运动神经支配的生理证据。方法:记录9例受试者在稳定等距腕伸肌收缩时桡侧腕伸肌的38个单肌纺锤体传入神经的放电情况。通过估计累积密度函数，研究了这些传入信号与整流表面肌电信号之间的相关性。结果:在纺锤体传入和肌电图之间的累积密度估计中，15个传入事件(39%)在- 30至- 10 ms之间的传入放电前获得了阳性肌电图峰值。结论:这一发现表明纺锤体传入和外伸活动之间存在耦合，表明人体肌纺锤体中存在广泛的骨融合运动神经支配。

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Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control

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