The Energy of Muscle Contraction. I. Tissue Force and Deformation During Fixed-End Contractions.
3D
MRI
contraction
deformation
energy
finite element model
muscle
tissue
Journal
Frontiers in physiology
ISSN: 1664-042X
Titre abrégé: Front Physiol
Pays: Switzerland
ID NLM: 101549006
Informations de publication
Date de publication:
2020
2020
Historique:
received:
03
01
2020
accepted:
18
06
2020
entrez:
28
9
2020
pubmed:
29
9
2020
medline:
29
9
2020
Statut:
epublish
Résumé
During contraction the energy of muscle tissue increases due to energy from the hydrolysis of ATP. This energy is distributed across the tissue as strain-energy potentials in the contractile elements, strain-energy potential from the 3D deformation of the base-material tissue (containing cellular and extracellular matrix effects), energy related to changes in the muscle's nearly incompressible volume and external work done at the muscle surface. Thus, energy is redistributed through the muscle's tissue as it contracts, with only a component of this energy being used to do mechanical work and develop forces in the muscle's longitudinal direction. Understanding how the strain-energy potentials are redistributed through the muscle tissue will help enlighten why the mechanical performance of whole muscle in its longitudinal direction does not match the performance that would be expected from the contractile elements alone. Here we demonstrate these physical effects using a 3D muscle model based on the finite element method. The tissue deformations within contracting muscle are large, and so the mechanics of contraction were explained using the principles of continuum mechanics for large deformations. We present simulations of a contracting medial gastrocnemius muscle, showing tissue deformations that mirror observations from magnetic resonance imaging. This paper tracks the redistribution of strain-energy potentials through the muscle tissue during fixed-end contractions, and shows how fibre shortening, pennation angle, transverse bulging and anisotropy in the stress and strain of the muscle tissue are all related to the interaction between the material properties of the muscle and the action of the contractile elements.
Identifiants
pubmed: 32982762
doi: 10.3389/fphys.2020.00813
pmc: PMC7487973
doi:
Types de publication
Journal Article
Langues
eng
Pagination
813Informations de copyright
Copyright © 2020 Wakeling, Ross, Ryan, Bolsterlee, Konno, Domínguez and Nigam.
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