Abstract：
:In anaesthetized cats, medial gastrocnemius motor units (MUs) were stimulated with random sequences (mean rates between 6 and 12 pps) of electrical pulses delivered to their axons in small ventral root filaments. Muscle tension was recorded under isometric conditions, and spike trains of muscle spindle afferents were recorded from small dorsal root filaments during prolonged MU activation. Time-domain (PSTH) and frequency-domain (gain) computations were performed to study the effects of fatiguing muscle unit contractions on the signal transmission from skeletomotor efferents to spindle afferents. In the course of muscle unit fatigue, during which the gain of the force-producing sub-system decreased, the gain of the sub-system transforming force to afferent discharge increased so that the overall gain between skeletomotor efferents and spindle afferents remained relatively high. This could be a mechanism that preserves a high quality of afferent information on MU contractions.
journal_name
Brain Resjournal_title
Brain researchauthors
Christakos CN,Windhorst Udoi
10.1016/0006-8993(86)91656-2subject
Has Abstractpub_date
1986-02-19 00:00:00pages
388-92issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(86)91656-2journal_volume
365pub_type
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