New insights on contraction efficiency in patients with Duchenne muscular dystrophy.
Identifieur interne : 003350 ( PubMed/Curation ); précédent : 003349; suivant : 003351New insights on contraction efficiency in patients with Duchenne muscular dystrophy.
Auteurs : Lilian Lacourpaille [France] ; François Hug [France] ; Arnaud Guével [France] ; Yann Péréon ; Armelle Magot ; Jean-Yves Hogrel [France] ; Antoine Nordez [France]Source :
- Journal of applied physiology (Bethesda, Md. : 1985) [ 1522-1601 ] ; 2014.
Descripteurs français
- KwdFr :
- Adolescent, Bras (physiopathologie), Contraction musculaire, Enfant, Enfant d'âge préscolaire, Femelle, Force musculaire, Humains, Imagerie d'élasticité tissulaire, Jeune adulte, Muscles squelettiques (imagerie diagnostique), Muscles squelettiques (physiopathologie), Myopathie de Duchenne (imagerie diagnostique), Myopathie de Duchenne (physiopathologie), Mâle, Nourrisson, Stimulation électrique, Transmission synaptique.
- MESH :
- imagerie diagnostique : Muscles squelettiques, Myopathie de Duchenne.
- physiopathologie : Bras, Muscles squelettiques, Myopathie de Duchenne.
- Adolescent, Contraction musculaire, Enfant, Enfant d'âge préscolaire, Femelle, Force musculaire, Humains, Imagerie d'élasticité tissulaire, Jeune adulte, Mâle, Nourrisson, Stimulation électrique, Transmission synaptique.
English descriptors
- KwdEn :
- Adolescent, Arm (physiopathology), Child, Child, Preschool, Elasticity Imaging Techniques, Electric Stimulation, Female, Humans, Infant, Male, Muscle Contraction, Muscle Strength, Muscle, Skeletal (diagnostic imaging), Muscle, Skeletal (physiopathology), Muscular Dystrophy, Duchenne (diagnostic imaging), Muscular Dystrophy, Duchenne (physiopathology), Synaptic Transmission, Young Adult.
- MESH :
- diagnostic imaging : Muscle, Skeletal, Muscular Dystrophy, Duchenne.
- physiopathology : Arm, Muscle, Skeletal, Muscular Dystrophy, Duchenne.
- Adolescent, Child, Child, Preschool, Elasticity Imaging Techniques, Electric Stimulation, Female, Humans, Infant, Male, Muscle Contraction, Muscle Strength, Synaptic Transmission, Young Adult.
Abstract
The decrease in muscle strength in patients with Duchenne muscular dystrophy (DMD) is mainly explained by a decrease in the number of active contractile elements. Nevertheless, it is possible that other electrochemical and force transmission processes may contribute. The present study aimed to quantify the effect of DMD on the relative contribution of electrochemical and force transmission components of the electromechanical delay (i.e., time lag between the onset of muscle activation and force production) in humans using very high frame rate ultrasound. Fourteen patients with DMD and thirteen control subjects underwent two electrically evoked contractions of the biceps brachii with the ultrasound probe over the muscle belly. The electromechanical delay was significantly longer in DMD patients compared with controls (18.5 ± 3.9 vs. 12.5 ± 1.4 ms, P < 0.0001). More precisely, DMD patients exhibited a longer delay between the onset of muscle fascicles motion and force production (13.6 ± 3.1 vs. 7.9 ± 2.0 ms, P < 0.0001). This delay was correlated to the chronological age of the DMD patients (r = 0.66; P = 0.01), but not of the controls (r = -0.45; P = 0.10). No significant difference was found for the delay between the onset of muscle stimulation and the onset of muscle fascicle motion. These results highlight the role of the alteration of muscle force transmission (delay between the onset of fascicle motion and force production) in the impairments of the contraction efficiency in patients with DMD.
DOI: 10.1152/japplphysiol.00544.2014
PubMed: 25103971
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<front><div type="abstract" xml:lang="en">The decrease in muscle strength in patients with Duchenne muscular dystrophy (DMD) is mainly explained by a decrease in the number of active contractile elements. Nevertheless, it is possible that other electrochemical and force transmission processes may contribute. The present study aimed to quantify the effect of DMD on the relative contribution of electrochemical and force transmission components of the electromechanical delay (i.e., time lag between the onset of muscle activation and force production) in humans using very high frame rate ultrasound. Fourteen patients with DMD and thirteen control subjects underwent two electrically evoked contractions of the biceps brachii with the ultrasound probe over the muscle belly. The electromechanical delay was significantly longer in DMD patients compared with controls (18.5 ± 3.9 vs. 12.5 ± 1.4 ms, P < 0.0001). More precisely, DMD patients exhibited a longer delay between the onset of muscle fascicles motion and force production (13.6 ± 3.1 vs. 7.9 ± 2.0 ms, P < 0.0001). This delay was correlated to the chronological age of the DMD patients (r = 0.66; P = 0.01), but not of the controls (r = -0.45; P = 0.10). No significant difference was found for the delay between the onset of muscle stimulation and the onset of muscle fascicle motion. These results highlight the role of the alteration of muscle force transmission (delay between the onset of fascicle motion and force production) in the impairments of the contraction efficiency in patients with DMD.</div>
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<Abstract><AbstractText>The decrease in muscle strength in patients with Duchenne muscular dystrophy (DMD) is mainly explained by a decrease in the number of active contractile elements. Nevertheless, it is possible that other electrochemical and force transmission processes may contribute. The present study aimed to quantify the effect of DMD on the relative contribution of electrochemical and force transmission components of the electromechanical delay (i.e., time lag between the onset of muscle activation and force production) in humans using very high frame rate ultrasound. Fourteen patients with DMD and thirteen control subjects underwent two electrically evoked contractions of the biceps brachii with the ultrasound probe over the muscle belly. The electromechanical delay was significantly longer in DMD patients compared with controls (18.5 ± 3.9 vs. 12.5 ± 1.4 ms, P < 0.0001). More precisely, DMD patients exhibited a longer delay between the onset of muscle fascicles motion and force production (13.6 ± 3.1 vs. 7.9 ± 2.0 ms, P < 0.0001). This delay was correlated to the chronological age of the DMD patients (r = 0.66; P = 0.01), but not of the controls (r = -0.45; P = 0.10). No significant difference was found for the delay between the onset of muscle stimulation and the onset of muscle fascicle motion. These results highlight the role of the alteration of muscle force transmission (delay between the onset of fascicle motion and force production) in the impairments of the contraction efficiency in patients with DMD.</AbstractText>
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