Fluctuations in motor output during steady contractions are weakly related across contraction types and between hands
Identifieur interne : 000265 ( Main/Exploration ); précédent : 000264; suivant : 000266Fluctuations in motor output during steady contractions are weakly related across contraction types and between hands
Auteurs : Minoru Shinohara [États-Unis] ; Kevin G. Keenan [États-Unis] ; Roger M. Enoka [États-Unis]Source :
- Muscle & Nerve [ 0148-639X ] ; 2005-06.
English descriptors
- Teeft :
- Abduction force, Aemg, Anisometric, Anisometric contraction, Anisometric contractions, Appl, Appl physiol, Contraction, Contraction intensity, Contraction type, Contraction types, Dependent variables, Discharge rate, Discharge rate variability, Dorsal, Dorsal interosseous muscle, Enoka, Fluctuation, Frequency content, Hand muscle, Independent variables, Interosseous, Isometric, Isometric contraction, Isometric contractions, June, Lond, Motor output, Motor unit activity, Motor units, Muscle nerve, Muscle nerve june, Neurophysiol, Nger, Peak force, Physiol, Position signals, Power spectrum density, Proximal interphalangeal, Right hand, Right hands, Semmler, Standard deviations, Steadiness, Steady contractions, Steady isometric, Strength training, Target force, Target forces, Total power, Uctuations, Voluntary contractions.
Abstract
The presence of differences in motor unit activity across contraction types and between hands suggests that the magnitude of fluctuations in motor output is only weakly related when these conditions are compared. Twenty right‐handed young (24.1 ± 5.3 years) and old (72.5 ± 4.9 years) adults performed three levels (≤40% of maximal force) of isometric and anisometric contractions with the first dorsal interosseous muscle of each hand. The fluctuations in motor output were quantified by the coefficient of variation for force during isometric contractions, and as the standard deviations of acceleration and position during anisometric contractions. There was no effect of age on fluctuations in motor output. The magnitude of the fluctuations in motor output was weakly related across contraction types (r2 < 0.325) and between hands (r2 < 0.262). Furthermore, the standard deviations of acceleration and position during shortening and lengthening contractions were largely unrelated to one another. Because the activity in a motor unit population differed across contraction types and hands during steady contractions, the central nervous system likely employed distinct strategies to accomplish these different tasks. Muscle Nerve, 2005
Url:
DOI: 10.1002/mus.20326
Affiliations:
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Twenty right‐handed young (24.1 ± 5.3 years) and old (72.5 ± 4.9 years) adults performed three levels (≤40% of maximal force) of isometric and anisometric contractions with the first dorsal interosseous muscle of each hand. The fluctuations in motor output were quantified by the coefficient of variation for force during isometric contractions, and as the standard deviations of acceleration and position during anisometric contractions. There was no effect of age on fluctuations in motor output. The magnitude of the fluctuations in motor output was weakly related across contraction types (r2 < 0.325) and between hands (r2 < 0.262). Furthermore, the standard deviations of acceleration and position during shortening and lengthening contractions were largely unrelated to one another. Because the activity in a motor unit population differed across contraction types and hands during steady contractions, the central nervous system likely employed distinct strategies to accomplish these different tasks. Muscle Nerve, 2005</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Shinohara, Minoru" sort="Shinohara, Minoru" uniqKey="Shinohara M" first="Minoru" last="Shinohara">Minoru Shinohara</name></noRegion><name sortKey="Enoka, Roger M" sort="Enoka, Roger M" uniqKey="Enoka R" first="Roger M." last="Enoka">Roger M. Enoka</name><name sortKey="Keenan, Kevin G" sort="Keenan, Kevin G" uniqKey="Keenan K" first="Kevin G." last="Keenan">Kevin G. Keenan</name><name sortKey="Shinohara, Minoru" sort="Shinohara, Minoru" uniqKey="Shinohara M" first="Minoru" last="Shinohara">Minoru Shinohara</name><name sortKey="Shinohara, Minoru" sort="Shinohara, Minoru" uniqKey="Shinohara M" first="Minoru" last="Shinohara">Minoru Shinohara</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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