慢性人类脊髓损伤会改变屈肌反射反应的肢体内部协调性。

The intralimb coordination of the flexor reflex response is altered in chronic human spinal cord injury.

作者信息

Deutsch Katherine M, Hornby T George, Schmit Brian D

机构信息

Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL 60611, USA.

出版信息

Neurosci Lett. 2005 Jun 3;380(3):305-10. doi: 10.1016/j.neulet.2005.01.060. Epub 2005 Feb 12.

Abstract

The current study compared the intralimb coordination of flexor reflex responses in spinal intact and complete chronic spinal cord injured (SCI) individuals. Noxious electrocutaneous stimulation was applied at the apex of the medial arch of the foot (50 mA, 500 Hz, 1 ms pulse width, 20 ms) in 21 complete chronic SCI and 19 spinal intact volunteers and the flexor reflex response was quantified by measuring the isometric joint torques at the ankle, knee and hip. The results showed that SCI individuals had significantly smaller peak knee and hip joint flexion torques, often exhibited a net knee extension torque, and produced a much smaller hip joint flexion torque during the flexor reflex response in contrast to the spinal intact individuals. The latency of the reflex response, measured from the tibialis anterior electromyogram, was comparable in both test populations. These findings indicate that the intralimb coordination of the flexor reflex response of chronic complete SCI individuals is altered, possibly reflecting a functional reorganization of the flexion pathways of the spinal cord.

摘要

本研究比较了脊髓完整和完全性慢性脊髓损伤(SCI)个体屈肌反射反应的肢体内部协调性。对21名完全性慢性SCI个体和19名脊髓完整的志愿者在足内侧弓顶端施加有害的皮肤电刺激(50 mA,500 Hz,1 ms脉冲宽度,20 ms),并通过测量踝关节、膝关节和髋关节的等长关节扭矩来量化屈肌反射反应。结果显示,与脊髓完整的个体相比,SCI个体的膝关节和髋关节最大屈曲扭矩明显较小,常表现出膝关节净伸展扭矩,且在屈肌反射反应期间产生的髋关节屈曲扭矩要小得多。从胫前肌肌电图测量的反射反应潜伏期在两个测试群体中相当。这些发现表明,慢性完全性SCI个体屈肌反射反应的肢体内部协调性发生了改变,这可能反映了脊髓屈曲通路的功能重组。

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