The nervous system does not compensate for an acute change in the balance of passive force between synergist muscles.
Identifieur interne : 000186 ( Main/Exploration ); précédent : 000185; suivant : 000187The nervous system does not compensate for an acute change in the balance of passive force between synergist muscles.
Auteurs : Lilian Lacourpaille [France] ; Antoine Nordez [France] ; François Hug [France]Source :
- The Journal of experimental biology [ 1477-9145 ] ; 2017.
Abstract
It is unclear how muscle activation strategies adapt to differential acute changes in the biomechanical characteristics between synergist muscles. This issue is fundamental to understanding the control of almost every joint in the body. The aim of this human experiment was to determine whether the relative activation of the heads of the triceps surae [gastrocnemius medialis (GM), gastrocnemius lateralis (GL) and soleus (SOL)] compensates for differential changes in passive force between these muscles. Twenty-four participants performed isometric ankle plantarflexion at 20 N m and 20% of the active torque measured during a maximal contraction, at three ankle angles (30 deg of plantarflexion, 0 and 25 deg of dorsiflexion; knee fully extended). Myoelectric activity (electromyography, EMG) provided an index of neural drive. Muscle shear modulus (elastography) provided an index of muscle force. Passive dorsiflexion induced a much larger increase in passive shear modulus for GM (+657.6±257.7%) than for GL (+488.7±257.9%) and SOL (+106.6±93.0%). However, the neural drive during submaximal tasks did not compensate for this change in the balance of the passive force. Instead, when considering the contraction at 20% MVC, GL root mean square (RMS) EMG was reduced at both 0 deg (-39.4±34.5%) and 25 deg dorsiflexion (-20.6±58.6%) compared with 30 deg plantarflexion, while GM and SOL RMS EMG did not change. As a result, the GM/GL ratio of shear modulus was higher at 0 deg and 25 deg dorsiflexion than at 30 deg plantarflexion, indicating that the greater the dorsiflexion angle, the stronger the bias of force to GM compared with GL. The magnitude of this change in force balance varied greatly between participants.
DOI: 10.1242/jeb.163303
PubMed: 28751493
Affiliations:
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last="Nordez">Antoine Nordez</name><affiliation wicri:level="3"><nlm:affiliation>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Hug, Francois" sort="Hug, Francois" uniqKey="Hug F" first="François" last="Hug">François Hug</name><affiliation wicri:level="3"><nlm:affiliation>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes, France francois.hug@univ-nantes.fr.</nlm:affiliation><country wicri:rule="url">France</country><wicri:regionArea>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2017">2017</date><idno type="RBID">pubmed:28751493</idno><idno type="pmid">28751493</idno><idno type="doi">10.1242/jeb.163303</idno><idno type="wicri:Area/PubMed/Corpus">000423</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">000423</idno><idno type="wicri:Area/PubMed/Curation">000421</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Curation">000421</idno><idno type="wicri:Area/PubMed/Checkpoint">000421</idno><idno type="wicri:explorRef" wicri:stream="Checkpoint" wicri:step="PubMed">000421</idno><idno type="wicri:Area/Ncbi/Merge">004B98</idno><idno 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Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Nordez, Antoine" sort="Nordez, Antoine" uniqKey="Nordez A" first="Antoine" last="Nordez">Antoine Nordez</name><affiliation wicri:level="3"><nlm:affiliation>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author><author><name sortKey="Hug, Francois" sort="Hug, Francois" uniqKey="Hug F" first="François" last="Hug">François Hug</name><affiliation wicri:level="3"><nlm:affiliation>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes, France francois.hug@univ-nantes.fr.</nlm:affiliation><country wicri:rule="url">France</country><wicri:regionArea>University of Nantes, Laboratory "Movement, Interactions, Performance" (EA 4334), Faculty of Sport Sciences, 44000 Nantes</wicri:regionArea><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Nantes</settlement></placeName></affiliation></author></analytic><series><title level="j">The Journal of experimental biology</title><idno type="eISSN">1477-9145</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">It is unclear how muscle activation strategies adapt to differential acute changes in the biomechanical characteristics between synergist muscles. This issue is fundamental to understanding the control of almost every joint in the body. The aim of this human experiment was to determine whether the relative activation of the heads of the triceps surae [gastrocnemius medialis (GM), gastrocnemius lateralis (GL) and soleus (SOL)] compensates for differential changes in passive force between these muscles. Twenty-four participants performed isometric ankle plantarflexion at 20 N m and 20% of the active torque measured during a maximal contraction, at three ankle angles (30 deg of plantarflexion, 0 and 25 deg of dorsiflexion; knee fully extended). Myoelectric activity (electromyography, EMG) provided an index of neural drive. Muscle shear modulus (elastography) provided an index of muscle force. Passive dorsiflexion induced a much larger increase in passive shear modulus for GM (+657.6±257.7%) than for GL (+488.7±257.9%) and SOL (+106.6±93.0%). However, the neural drive during submaximal tasks did not compensate for this change in the balance of the passive force. Instead, when considering the contraction at 20% MVC, GL root mean square (RMS) EMG was reduced at both 0 deg (-39.4±34.5%) and 25 deg dorsiflexion (-20.6±58.6%) compared with 30 deg plantarflexion, while GM and SOL RMS EMG did not change. As a result, the GM/GL ratio of shear modulus was higher at 0 deg and 25 deg dorsiflexion than at 30 deg plantarflexion, indicating that the greater the dorsiflexion angle, the stronger the bias of force to GM compared with GL. The magnitude of this change in force balance varied greatly between participants.</div></front></TEI><affiliations><list><country><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="Lacourpaille, Lilian" sort="Lacourpaille, Lilian" uniqKey="Lacourpaille L" first="Lilian" last="Lacourpaille">Lilian Lacourpaille</name></region><name sortKey="Hug, Francois" sort="Hug, Francois" uniqKey="Hug F" first="François" last="Hug">François Hug</name><name sortKey="Nordez, Antoine" sort="Nordez, Antoine" uniqKey="Nordez A" first="Antoine" last="Nordez">Antoine Nordez</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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