Muscle length effect on corticospinal excitability during maximal concentric, isometric and eccentric contractions of the knee extensors.
Identifieur interne : 000771 ( Main/Exploration ); précédent : 000770; suivant : 000772Muscle length effect on corticospinal excitability during maximal concentric, isometric and eccentric contractions of the knee extensors.
Auteurs : Valentin Doguet [France] ; Kazunori Nosaka [Australie] ; Arnaud Guével [France] ; Gary Thickbroom [Australie] ; Kazuhiro Ishimura [Australie] ; Marc Jubeau [France]Source :
- Experimental physiology [ 1469-445X ] ; 2017.
Abstract
What is the central question of this study? Does sensory input from peripheral mechanoreceptors determine the specific neural control of eccentric contractions? How corticospinal excitability (i.e. muscle responses to motor cortex stimulation) is affected by muscle length has never been investigated during eccentric contractions. What is the main finding and its importance? Muscle length does not influence corticospinal excitability during concentric and isometric maximal contractions, but does during eccentric maximal contractions. This indicates that neural control in eccentric contractions differs from that in concentric and isometric contractions. Neural control of eccentric contractions differs from that of concentric and isometric contractions, but no previous study has compared responses to motor cortex stimulations at long muscle lengths during such contraction types. In this study, we compared the effect of muscle length on corticospinal excitability between maximal concentric, isometric and eccentric contractions of the knee extensors. Twelve men performed 12 maximal concentric, isometric and eccentric voluntary contractions (36 contractions in total), separated by a 5 min rest between contraction types. The 12 contractions for the same contraction type were performed every 10 s, and transcranial magnetic stimulations (first eight contractions) and electrical femoral nerve stimulations (last four contractions) were superimposed alternately at 75 and 100 deg of knee flexion. Average motor evoked potential amplitude, normalized to the maximal M wave amplitude (MEP/M) and cortical silent period duration were calculated for each angle and compared among the contraction types. The MEP/M was lower (-23 and -28%, respectively) during eccentric than both concentric and isometric contractions at 75 deg, but similar between contraction types at 100 deg (P < 0.05). The cortical silent period duration was shorter (-12 and -10%, respectively) during eccentric than both concentric and isometric contractions at 75 deg, but longer (+11 and +9%, respectively) during eccentric contractions at 100 deg (P < 0.05). These results show that corticospinal excitability during eccentric contractions is angle dependent such that cortical inhibitory processes are greater with no alteration of corticospinal excitability at 100 deg, whereas this control is reversed at 75 deg.
DOI: 10.1113/EP086480
PubMed: 28796385
Affiliations:
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Nantes</wicri:regionArea><placeName><region type="region">Pays de la Loire</region><region type="old region">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Nosaka, Kazunori" sort="Nosaka, Kazunori" uniqKey="Nosaka K" first="Kazunori" last="Nosaka">Kazunori Nosaka</name><affiliation wicri:level="1"><nlm:affiliation>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia</wicri:regionArea><wicri:noRegion>Western Australia</wicri:noRegion></affiliation></author><author><name sortKey="Guevel, Arnaud" sort="Guevel, Arnaud" uniqKey="Guevel A" first="Arnaud" last="Guével">Arnaud Guével</name><affiliation wicri:level="3"><nlm:affiliation>Laboratory 'Movement, Interactions, Performance', EA 4334, Faculty of Sport Sciences, University of Nantes, Nantes, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratory 'Movement, Interactions, Performance', EA 4334, Faculty of Sport Sciences, University of Nantes, Nantes</wicri:regionArea><placeName><region type="region">Pays de la Loire</region><region type="old region">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Thickbroom, Gary" sort="Thickbroom, Gary" uniqKey="Thickbroom G" first="Gary" last="Thickbroom">Gary Thickbroom</name><affiliation wicri:level="1"><nlm:affiliation>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia</wicri:regionArea><wicri:noRegion>Western Australia</wicri:noRegion></affiliation></author><author><name sortKey="Ishimura, Kazuhiro" sort="Ishimura, Kazuhiro" uniqKey="Ishimura K" first="Kazuhiro" last="Ishimura">Kazuhiro Ishimura</name><affiliation wicri:level="1"><nlm:affiliation>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.</nlm:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia</wicri:regionArea><wicri:noRegion>Western Australia</wicri:noRegion></affiliation></author><author><name sortKey="Jubeau, Marc" sort="Jubeau, Marc" uniqKey="Jubeau M" first="Marc" last="Jubeau">Marc Jubeau</name><affiliation wicri:level="3"><nlm:affiliation>Laboratory 'Movement, Interactions, Performance', EA 4334, Faculty of Sport Sciences, University of Nantes, Nantes, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Laboratory 'Movement, Interactions, Performance', EA 4334, Faculty of Sport Sciences, University of Nantes, Nantes</wicri:regionArea><placeName><region type="region">Pays de la Loire</region><region type="old region">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author></analytic><series><title level="j">Experimental physiology</title><idno type="eISSN">1469-445X</idno><imprint><date when="2017" type="published">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">What is the central question of this study? Does sensory input from peripheral mechanoreceptors determine the specific neural control of eccentric contractions? How corticospinal excitability (i.e. muscle responses to motor cortex stimulation) is affected by muscle length has never been investigated during eccentric contractions. What is the main finding and its importance? Muscle length does not influence corticospinal excitability during concentric and isometric maximal contractions, but does during eccentric maximal contractions. This indicates that neural control in eccentric contractions differs from that in concentric and isometric contractions. Neural control of eccentric contractions differs from that of concentric and isometric contractions, but no previous study has compared responses to motor cortex stimulations at long muscle lengths during such contraction types. In this study, we compared the effect of muscle length on corticospinal excitability between maximal concentric, isometric and eccentric contractions of the knee extensors. Twelve men performed 12 maximal concentric, isometric and eccentric voluntary contractions (36 contractions in total), separated by a 5 min rest between contraction types. The 12 contractions for the same contraction type were performed every 10 s, and transcranial magnetic stimulations (first eight contractions) and electrical femoral nerve stimulations (last four contractions) were superimposed alternately at 75 and 100 deg of knee flexion. Average motor evoked potential amplitude, normalized to the maximal M wave amplitude (MEP/M) and cortical silent period duration were calculated for each angle and compared among the contraction types. The MEP/M was lower (-23 and -28%, respectively) during eccentric than both concentric and isometric contractions at 75 deg, but similar between contraction types at 100 deg (P < 0.05). The cortical silent period duration was shorter (-12 and -10%, respectively) during eccentric than both concentric and isometric contractions at 75 deg, but longer (+11 and +9%, respectively) during eccentric contractions at 100 deg (P < 0.05). These results show that corticospinal excitability during eccentric contractions is angle dependent such that cortical inhibitory processes are greater with no alteration of corticospinal excitability at 100 deg, whereas this control is reversed at 75 deg.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Pays de la Loire</li></region><settlement><li>Nantes</li></settlement></list><tree><country name="France"><region name="Pays de la Loire"><name sortKey="Doguet, Valentin" sort="Doguet, Valentin" uniqKey="Doguet V" first="Valentin" last="Doguet">Valentin Doguet</name></region><name sortKey="Guevel, Arnaud" sort="Guevel, Arnaud" uniqKey="Guevel A" first="Arnaud" last="Guével">Arnaud Guével</name><name sortKey="Jubeau, Marc" sort="Jubeau, Marc" uniqKey="Jubeau M" first="Marc" last="Jubeau">Marc Jubeau</name></country><country name="Australie"><noRegion><name sortKey="Nosaka, Kazunori" sort="Nosaka, Kazunori" uniqKey="Nosaka K" first="Kazunori" last="Nosaka">Kazunori Nosaka</name></noRegion><name sortKey="Ishimura, Kazuhiro" sort="Ishimura, Kazuhiro" uniqKey="Ishimura K" first="Kazuhiro" last="Ishimura">Kazuhiro Ishimura</name><name sortKey="Thickbroom, Gary" sort="Thickbroom, Gary" uniqKey="Thickbroom G" first="Gary" last="Thickbroom">Gary Thickbroom</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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