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https://hdl.handle.net/2440/34760
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dc.contributor.author | Semmler, J. | - |
dc.contributor.author | Kornatz, K. | - |
dc.contributor.author | Enoka, R. | - |
dc.date.issued | 2003 | - |
dc.identifier.citation | Journal of Neurophysiology, 2003; 90(2):1346-1349 | - |
dc.identifier.issn | 0022-3077 | - |
dc.identifier.issn | 1522-1598 | - |
dc.identifier.uri | http://hdl.handle.net/2440/34760 | - |
dc.description | Copyright © 2003 The American Physiological Society | - |
dc.description.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. | - |
dc.description.statementofresponsibility | John G. Semmler, Kurt W. Kornatz and Roger M. Enoka | - |
dc.language.iso | en | - |
dc.publisher | Amer Physiological Soc | - |
dc.source.uri | http://jn.physiology.org/cgi/content/abstract/90/2/1346 | - |
dc.subject | Hand | - |
dc.subject | Muscle, Skeletal | - |
dc.subject | Humans | - |
dc.subject | Electrophysiology | - |
dc.subject | Aging | - |
dc.subject | Isometric Contraction | - |
dc.subject | Adult | - |
dc.subject | Aged | - |
dc.title | Motor-unit coherence during isometric contractions is greater in a hand muscle of older adults | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1152/jn.00941.2002 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Semmler, J. [0000-0003-0260-8047] | - |
Appears in Collections: | Aurora harvest Molecular and Biomedical Science publications |
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