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• W3106622739 abstract "3D strain or strain rate tensor mapping comprehensively captures regional muscle deformation. While compressive strain along the muscle fiber is a potential measure of the force generated, radial strains in the fiber cross-section may provide information on the material properties of the extracellular matrix. Additionally, shear strain may potentially inform on the shearing of the extracellular matrix; the latter has been hypothesized as the mechanism of lateral transmission of force. Here, we implement a novel fast MR method for velocity mapping to acquire multi-slice images at different % maximum voluntary contraction (MVC) for 3D strain mapping to explore deformation in the plantar-flexors under isometric contraction in a cohort of young and senior subjects. 3D strain rate and strain tensors were computed and eigenvalues and two invariants (maximum shear and volumetric strain) were extracted. Strain and strain rate indices (contractile and in-plane strain/strain rate, shear strain/strain rate) changed significantly with %MVC (30 and 60% MVC) and contractile and shear strain with age in the medial gastrocnemius. In the soleus, significant differences with age in contractile and shear strain were seen. Univariate regression revealed weak but significant correlation of in-plane and shear strain and shear strain rate indices to %MVC and correlation of contractile and shear strain indices to force. The ability to map strain tensor components provides unique insights into muscle physiology: with contractile strain providing an index of the force generated by the muscle fibers while the shear strain could potentially be a marker of lateral transmission of force." @default.
• W3106622739 created "2020-12-07" @default.
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• W3106622739 date "2020-12-03" @default.
• W3106622739 modified "2023-10-17" @default.
• W3106622739 title "3D Muscle Deformation Mapping at Submaximal Isometric Contractions: Applications to Aging Muscle" @default.
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• W3106622739 doi "https://doi.org/10.3389/fphys.2020.600590" @default.
• W3106622739 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7744822" @default.
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