Contractions of single motor units are reflected in membrane potential changes of homonymous alpha-motoneurons |
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| Authors: | W Koehler T M Hamm R M Enoka D G Stuart U Windhorst |
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| Affiliation: | 1. University of Arizona, Health Sciences Center, Department of Physiology, Tucson, AZ 85724 U.S.A.;2. Zentrum Physiologie und Pathophysiologie der Universität, Abteilung Neuro-und Sinnesphysiologie, 3400 Göttingen F.R.G. |
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| Abstract: | In anesthetized cats 3 medial gastrocnemius (MG) motor units (MUs) were electrically activated with independent pseudorandom patterns at physiological mean rates. Recordings of isometric MG tension (T) and membrane potential changes (PSPs) in MG alpha-motoneurons (MNs) were averaged with respect to each stimulus train. The resulting T and PSP trajectories displayed the responses of each MN to the 3 average MU twitches. These responses could vary from no response to a sequence of depolarizing and hyperpolarizing waves in a PSP trajectory. The results are consistent with the known behavior of muscle stretch receptors to muscle and MU twitches and the receptors' connections to homonymous MNs. |
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| Keywords: | medial gastrocnemius muscle α-motoneurons motor units stretch receptor afferents central connections |
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