AustralieFrV1, Main, Exploration, bibRecord, 005C75

Evidence of changes in load sharing during isometric elbow flexion with ramped torque

Identifieur interne : 005C75 ( Main/Exploration ); précédent : 005C74; suivant : 005C76

Evidence of changes in load sharing during isometric elbow flexion with ramped torque

Auteurs : Killian Bouillard [France] ; Antoine Nordez [France] ; Paul W. Hodges [Australie] ; Christophe Cornu [France] ; François Hug [France]

Source :

Journal of biomechanics [ 0021-9290 ] ; 2012.

RBID : Pascal:12-0313298

Descripteurs français

Pascal (Inist)
- Coude, Flexion, Module cisaillement, Module élasticité, Elastographie, Homme, Onde S, Génie biomédical, Muscle fléchisseur du coude, Contraction musculaire isométrique, Biomécanique.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Bending, Biomechanics, Biomedical engineering, Elastic modulus, Elastography, Elbow, Flexor muscle of the elbow, Human, Isometric muscular contraction, S wave, Shear modulus.

Abstract

This study aimed to: (1) test the repeatability of Supersonic Shear Imaging measures of muscle shear elastic modulus of four elbow flexor muscles during isometric elbow flexion with ramped torque; (2) determine the relationship between muscle shear elastic modulus and elbow torque for the four elbow flexor muscles, and (3) investigate changes in load sharing between synergist elbow flexor muscles with increases in elbow flexor torque. Ten subjects performed ten isometric elbow flexions consisting of linear torque ramps of 30-s from 0 to 40% of maximal voluntary contraction. The shear elastic modulus of each elbow flexor muscle (biceps brachii long head [BB_LH], biceps brachii short head [BB_SH], brachialis [BA], and brachoradialis [BR]) and of triceps brachii long head [TB] was measured twice with individual muscles recorded in separate trials in random order. A good repeatability of the shape of the changes in shear elastic modulus as a function of torque was found for each elbow flexor muscle (r-values: 0.85 to 0.94). Relationships between the shear elastic modulus and torque were best explained by a second order polynomial, except BA where a higher polynomial was required. Statistical analysis showed that BB_SH and BB_LH had an initial slow change at low torques followed by an increasing rate of increase in modulus with higher torques. In contrast, the BA shear elastic modulus increased rapidly at low forces, but plateaued at higher forces. These results suggest that changes in load sharing between synergist elbow flexors could partly explain the non-linear EMG-torque relationship classically reported for BB during isometric efforts.

Affiliations:

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Le document en format XML

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<term>Biomechanics</term>
<term>Biomedical engineering</term>
<term>Elastic modulus</term>
<term>Elastography</term>
<term>Elbow</term>
<term>Flexor muscle of the elbow</term>
<term>Human</term>
<term>Isometric muscular contraction</term>
<term>S wave</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Coude</term>
<term>Flexion</term>
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<term>Module élasticité</term>
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<term>Homme</term>
<term>Onde S</term>
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<front><div type="abstract" xml:lang="en">This study aimed to: (1) test the repeatability of Supersonic Shear Imaging measures of muscle shear elastic modulus of four elbow flexor muscles during isometric elbow flexion with ramped torque; (2) determine the relationship between muscle shear elastic modulus and elbow torque for the four elbow flexor muscles, and (3) investigate changes in load sharing between synergist elbow flexor muscles with increases in elbow flexor torque. Ten subjects performed ten isometric elbow flexions consisting of linear torque ramps of 30-s from 0 to 40% of maximal voluntary contraction. The shear elastic modulus of each elbow flexor muscle (biceps brachii long head [BB<sub>LH</sub>
], biceps brachii short head [BB<sub>SH</sub>
], brachialis [BA], and brachoradialis [BR]) and of triceps brachii long head [TB] was measured twice with individual muscles recorded in separate trials in random order. A good repeatability of the shape of the changes in shear elastic modulus as a function of torque was found for each elbow flexor muscle (r-values: 0.85 to 0.94). Relationships between the shear elastic modulus and torque were best explained by a second order polynomial, except BA where a higher polynomial was required. Statistical analysis showed that BB<sub>SH</sub>
 and BB<sub>LH</sub>
 had an initial slow change at low torques followed by an increasing rate of increase in modulus with higher torques. In contrast, the BA shear elastic modulus increased rapidly at low forces, but plateaued at higher forces. These results suggest that changes in load sharing between synergist elbow flexors could partly explain the non-linear EMG-torque relationship classically reported for BB during isometric efforts.</div>
</front>
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<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>
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<country name="Australie"><noRegion><name sortKey="Hodges, Paul W" sort="Hodges, Paul W" uniqKey="Hodges P" first="Paul W." last="Hodges">Paul W. Hodges</name>
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Evidence of changes in load sharing during isometric elbow flexion with ramped torque

Evidence of changes in load sharing during isometric elbow flexion with ramped torque

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri