a study of the effect of extreme physical stress on the contractility of an isolated heart , its cpk loss associated with anoxia and reoxygenation , and myocardial adenyl components and lactate levels under acute overstrain of the heart achieved through a complete obstruction of the aorta , showed the animals doing exercise to have reduced cardiac contractility , increased perfusate cpk waste , and sharply decreased myocardial macroergic phosphate levels under acute overstrain by pressure .
C0018787
cardiac
C0027061
myocardial