A duality principle for viscoelastic relaxation of cardiac muscle (Q794946)

With the exception of the transition between completed isometric relaxation and peak velocity of isotonic lengthening, physiological relaxation is proved equivalent to a viscoelastic behavior consisting of stress relaxation at constant strain and strain creep at constant stress. The ratio of initial (final) stress (strain) to final (initial) stress (strain) equals the ratio of initial viscoelastic material stiffness, as measured by the relaxation function, to asymptotic elastic material stiffness, as given by the shear modulus. This represents a duality principle for relaxation of cardiac muscle.