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https://hdl.handle.net/2440/34760
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Type: | Journal article |
Title: | Motor-unit coherence during isometric contractions is greater in a hand muscle of older adults |
Author: | Semmler, J. Kornatz, K. Enoka, R. |
Citation: | Journal of Neurophysiology, 2003; 90(2):1346-1349 |
Publisher: | Amer Physiological Soc |
Issue Date: | 2003 |
ISSN: | 0022-3077 1522-1598 |
Statement of Responsibility: | John G. Semmler, Kurt W. Kornatz and Roger M. Enoka |
Abstract: | The purpose of this study was to quantify the strength of motor-unit coherence from the first dorsal interosseus muscle in young and old adults using data obtained in a previous study, where no differences in motor-unit synchronization between the two groups were observed. The strength of motor-unit coherence was quantified from 47 motor-unit pairs in 11 young adults (age 24.1 ± 4.1 yrs) and from 48 motor-unit pairs in 14 old adults (age 70.4 ± 5.9 yrs). The strength of motor-unit coherence was greater in old adults, particularly at low frequencies of 5–9 Hz (85% greater in old adults at 5 Hz). In addition, the older adults expressed an extra oscillation at approximately 12–13 Hz that was not present in the young subjects. These data demonstrate that common oscillatory inputs to motor neurons (motor-unit coherence) are enhanced in older adults despite no age-related difference in the strength of shared inputs (synchronization). Furthermore, the data emphasize that measures of motor-unit synchronization and coherence highlight different features of the same common input, and a coherence analysis may be a more sensitive tool to characterize shared input to motor neurons. |
Keywords: | Hand Muscle, Skeletal Humans Electrophysiology Aging Isometric Contraction Adult Aged |
Description: | Copyright © 2003 The American Physiological Society |
DOI: | 10.1152/jn.00941.2002 |
Published version: | http://jn.physiology.org/cgi/content/abstract/90/2/1346 |
Appears in Collections: | Aurora harvest Molecular and Biomedical Science publications |
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