Firing rate trajectories of human motor units during activity-dependent muscle potentiation

Author:

Zero Alexander M.1ORCID,Kirk Eric A.1ORCID,Rice Charles L.12ORCID

Affiliation:

1. Faculty of Health Sciences, School of Kinesiology, The University of Western Ontario, London, Ontario, Canada

2. Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada

Abstract

During activity-dependent muscle potentiation (ADP), initial motor unit firing rate (MUFR) acceleration and the occurrence of MUFR trajectory saturation as a function of increasing contraction intensity were assessed. With no ADP (control), trajectories were more likely to accelerate and saturate (16/25 units) compared with voluntary- and stimulated-induced ADP conditions (4/25 and 8/25 units, respectively) that were fit better linearly. Therefore, during ADP, an attenuated intrinsic response to voluntary synaptic inputs occurs.

Funder

Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada

Publisher

American Physiological Society

Subject

Physiology (medical),Physiology

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