当前位置： SCI文献检索 > JOURNAL OF NEUROTRAUMA期刊下所有文献 > Recruitment of spinal motor pools during voluntary movements versus stepping after human spinal cord injury.

Recruitment of spinal motor pools during voluntary movements versus stepping after human spinal cord injury.

Abstract：

:We investigated the activation of lower limb motor pools by supraspinal and spinal networks after human spinal cord injury (SCI). We compared electromyographic (EMG) activity from six muscles during voluntarily attempted non-weight-bearing single-joint movements, multijoint movements approximating stepping in a supine position, and weight-bearing stepping on a treadmill with body weight support (BWST) in seven clinically incomplete and three clinically complete SCI subjects. Seven SCI subjects had previously completed Laufband therapy (a specific step training using variable levels of body weight support and manual assistance). Significant coactivation of agonists and antagonists and multijoint flexion or extension movements of the entire limb occurred during attempts at isolated knee or ankle single-joint movements in clinically incomplete SCI subjects. Further, some muscles that were not recruited during voluntary attempts at single-joint movements were activated during voluntary step-like multijoint movements (5/16 comparisons). This suggests that the residual voluntary motor control in incomplete SCI subjects evokes more generalized motor patterns (limb flexion or extension) rather than selective activation of individual muscles. Clinically incomplete and clinically complete SCI subjects could achieve greater activation of motor pools and more reciprocal patterns of activity between agonists and antagonists during weight bearing stepping than during non-weight-bearing voluntary movements. The EMG mean amplitudes were higher during stepping than during voluntary movements in 50/60 muscles studied (p < 0.05). These results suggest that stepping with knee and hip extension and flexion and alternating lower limb loading and unloading provides proprioceptive inputs to the spinal cord that increases motor recruitment and improves reciprocity between agonists and antagonists compared to voluntary efforts.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Maegele M,Müller S,Wernig A,Edgerton VR,Harkema SJ

doi

10.1089/08977150260338010

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

1217-29

issue

eissn

0897-7151

issn

1557-9042

journal_volume

pub_type

杂志文章

在线工具

Recruitment of spinal motor pools during voluntary movements versus stepping after human spinal cord injury.