Motor unit firing rates in young and very old adult males during an isokinetic fatiguing task and short-term recovery in the anconeus muscle

Author:

Zero Alexander M.1ORCID,Kirk Eric A.2ORCID,Gilmore Kevin J.3,Rice Charles L.14ORCID

Affiliation:

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

2. Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States

3. Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

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

Abstract

Maximal motor unit firing rates were recorded during an isokinetic fatiguing protocol and short-term recovery in young and very old adult males. Prior studies were limited to isometric fatiguing tasks. Despite the old being ∼37% weaker and less fatigable, anconeus rates during elbow extension declined with fatigue and recovered similarly to young males. Therefore, it is unlikely that greater fatigue resistance of very old males during isokinetic contractions is related to differences in motor unit rates.

Funder

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

Publisher

American Physiological Society

Subject

Physiology,General Neuroscience

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