An analytical description of heart muscle

A recently developed analytical model of the canine left ventricle characterizes the left heart as a pressure source that varies with time and volume. A similar approach led to an analytical model of muscle strip, embodied as a force generator that varies with time and volume. The model arises from isometric contractions and includes muscle´s passive and active force components, isotonic contractions, an inverse relation between muscle load and shortening, a direct relation between initial muscle length and shortening and Hill´s hyperbolic force-length relation, all with one set of constants