Abstract：
:In anesthetized cats, medial gastrocnemius motor units (MUs) were electrically stimulated via their ventral-root axons with independent random patterns. Muscle tension and homonymous alpha-motoneuron (alpha-MN) membrane potential fluctuations in response to these stimuli were recorded simultaneously. Cross-correlating these two signals in temporal relation to the stimuli showed the covariance of the two signals around their respective means. With moderate to strong MU-MN couplings indicated by clear and large average membrane potential changes (PSP trajectories), the correlation coefficients tended to be positive at times when the PSP hyperpolarized, and vice versa. These relations are probably caused by the non-linear behavior of MUs, muscle receptors and afferent pathways. Thus, the signal transfer from motor efferents back to homonymous alpha-MNs depended upon the level of background tension, upon which MU twitches were superimposed.
journal_name
Brain Resjournal_title
Brain researchauthors
Koehler W,Hamm TM,Enoka RM,Stuart DG,Windhorst Udoi
10.1016/0006-8993(85)90763-2subject
Has Abstractpub_date
1985-09-23 00:00:00pages
388-93issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(85)90763-2journal_volume
343pub_type
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