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Stress-stretch relation of muscle materials under uniaxial deformation: (A) the comparison of compressive stress-stretch experimental data of muscle tissue and the response of the connective tissue (CT) material model fitted using Equation (6) with different stiffness; (B) the stress-stretch response of the isotropic part of the muscle fiber model in Equation (2) with different stiffness; The stretch ratio is along the direction in which the material is stretched or compressed
