Functional consequences of motor unit recruitment order reversals following spinal cord transection in cat.
作者： Russell G. Durkovic
DOI: 10.1080/08990220600700891
关键词:
摘要: Motoneuron recruitment order determinations were made for acute, 2-week chronic, and 3-month chronic spinal cats by comparing cutaneous nerve stimulation thresholds evoking single unit tibialis anterior (TA) electromyogram (EMG) spikes of different sizes. Recruitment was largely (∼80%) orderly (small recruited at lower stimulus intensities than large spikes) in acute animals. However, animals reversed, with units more often small (∼65%). Morphological analyses TA muscle fibers suggested that fiber size changes unlikely to account the dramatic alterations results Additional studies reversal coincided an enhanced reflex neural output (increased or gain) flexion which compensated disus...
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