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Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue

We investigated the in vivo effects of voluntary fatiguing isometric contractions of the knee extensor muscles on the viscoelastic properties of the vastus lateralis (VL). Twelve young males (29.0 ± 4.5 years) performed an intermittent voluntary fatigue protocol consisting of 6 sets × 10 repetitions...

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Autores principales: Chalchat, Emeric, Gennisson, Jean-Luc, Peñailillo, Luis, Oger, Myriam, Malgoyre, Alexandra, Charlot, Keyne, Bourrilhon, Cyprien, Siracusa, Julien, Garcia-Vicencio, Sebastian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7194212/
https://www.ncbi.nlm.nih.gov/pubmed/32390859
http://dx.doi.org/10.3389/fphys.2020.00307
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author Chalchat, Emeric
Gennisson, Jean-Luc
Peñailillo, Luis
Oger, Myriam
Malgoyre, Alexandra
Charlot, Keyne
Bourrilhon, Cyprien
Siracusa, Julien
Garcia-Vicencio, Sebastian
author_facet Chalchat, Emeric
Gennisson, Jean-Luc
Peñailillo, Luis
Oger, Myriam
Malgoyre, Alexandra
Charlot, Keyne
Bourrilhon, Cyprien
Siracusa, Julien
Garcia-Vicencio, Sebastian
author_sort Chalchat, Emeric
collection PubMed
description We investigated the in vivo effects of voluntary fatiguing isometric contractions of the knee extensor muscles on the viscoelastic properties of the vastus lateralis (VL). Twelve young males (29.0 ± 4.5 years) performed an intermittent voluntary fatigue protocol consisting of 6 sets × 10 repetitions of 5-s voluntary maximal isometric contractions with 5-s passive recovery periods between repetitions. Voluntary and evoked torque were assessed before, immediately after, and 20 min after exercise. The shear modulus (μ) of the VL muscle was estimated at rest and during a ramped isometric contraction using a conventional elastography technique. An index of active muscle stiffness was then calculated (slope from the relationship between shear modulus and absolute torque). Resting muscle viscosity (η) was quantified using a shear-wave spectroscopy sequence to measure the shear-wave dispersion. Voluntary and evoked torque decreased by ∼37% (P < 0.01) immediately after exercise. The resting VL μ was lower at the end of the fatigue protocol (−57.9 ± 5.4%, P < 0.001), whereas the resting VL η increased (179.0 ± 123%, P < 0.01). The active muscle stiffness index also decreased with fatigue (P < 0.05). By 20 min post-fatigue, there were no significant differences from the pre-exercise values for VL η and the active muscle stiffness index, contrary to the resting VL μ. We show that the VL μ is greatly reduced and η greatly enhanced by fatigue, reflecting a more compliant and viscous muscle. The quantification of both shear μ and η moduli in vivo may contribute to a better understanding of the mechanical behavior of muscles during fatigue in sports medicine, as well as in clinical situations.
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spelling pubmed-71942122020-05-08 Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue Chalchat, Emeric Gennisson, Jean-Luc Peñailillo, Luis Oger, Myriam Malgoyre, Alexandra Charlot, Keyne Bourrilhon, Cyprien Siracusa, Julien Garcia-Vicencio, Sebastian Front Physiol Physiology We investigated the in vivo effects of voluntary fatiguing isometric contractions of the knee extensor muscles on the viscoelastic properties of the vastus lateralis (VL). Twelve young males (29.0 ± 4.5 years) performed an intermittent voluntary fatigue protocol consisting of 6 sets × 10 repetitions of 5-s voluntary maximal isometric contractions with 5-s passive recovery periods between repetitions. Voluntary and evoked torque were assessed before, immediately after, and 20 min after exercise. The shear modulus (μ) of the VL muscle was estimated at rest and during a ramped isometric contraction using a conventional elastography technique. An index of active muscle stiffness was then calculated (slope from the relationship between shear modulus and absolute torque). Resting muscle viscosity (η) was quantified using a shear-wave spectroscopy sequence to measure the shear-wave dispersion. Voluntary and evoked torque decreased by ∼37% (P < 0.01) immediately after exercise. The resting VL μ was lower at the end of the fatigue protocol (−57.9 ± 5.4%, P < 0.001), whereas the resting VL η increased (179.0 ± 123%, P < 0.01). The active muscle stiffness index also decreased with fatigue (P < 0.05). By 20 min post-fatigue, there were no significant differences from the pre-exercise values for VL η and the active muscle stiffness index, contrary to the resting VL μ. We show that the VL μ is greatly reduced and η greatly enhanced by fatigue, reflecting a more compliant and viscous muscle. The quantification of both shear μ and η moduli in vivo may contribute to a better understanding of the mechanical behavior of muscles during fatigue in sports medicine, as well as in clinical situations. Frontiers Media S.A. 2020-04-24 /pmc/articles/PMC7194212/ /pubmed/32390859 http://dx.doi.org/10.3389/fphys.2020.00307 Text en Copyright © 2020 Chalchat, Gennisson, Peñailillo, Oger, Malgoyre, Charlot, Bourrilhon, Siracusa and Garcia-Vicencio. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Physiology
Chalchat, Emeric
Gennisson, Jean-Luc
Peñailillo, Luis
Oger, Myriam
Malgoyre, Alexandra
Charlot, Keyne
Bourrilhon, Cyprien
Siracusa, Julien
Garcia-Vicencio, Sebastian
Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title_full Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title_fullStr Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title_full_unstemmed Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title_short Changes in the Viscoelastic Properties of the Vastus Lateralis Muscle With Fatigue
title_sort changes in the viscoelastic properties of the vastus lateralis muscle with fatigue
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7194212/
https://www.ncbi.nlm.nih.gov/pubmed/32390859
http://dx.doi.org/10.3389/fphys.2020.00307
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