High energy phosphate content of cardiac muscle under various experimental conditions which alter contractile strength

each. They were fed on a diet of Purina rabbit chow supplemented with green vegetables or a solutionof vitaminC. For each experimenta guinea pig was first anesthetized by intraperi toneal injection of sodium pentobarbital, and its heartwas then rapidlyexcisedand placedin a small beaker containing Krebs solution (Krebs and Henzeleit,1932)atroom temperature,through whichwas bubbled95