MEDICAL PHYSIOLOGY

Detailed explanation-1: -Cardiac output during exercise increases greatly owing to the relatively high heart rates that are achieved during exercise. Heart rate increases proportionately with workload until heart rates close to maximal are attained.

Detailed explanation-2: -Cardiac output in humans is generally 5-6 L/min in an at-rest to more than 35 L/min in elite athletes during exercise. HR is determined by signals from the sinoatrial node, which automatically depolarizes at an intrinsic rate of 60 to 100 times each minute.

Detailed explanation-3: -The heart rate is perhaps the simplest determinant of cardiac output to visualize: the faster the heart beats, the more blood can be pumped over a particular period of time.

Detailed explanation-4: -When you exercise regularly more blood is pumped out of the heart and into the body. Much the same as resting heart rate, increased stroke volume makes the heart more efficient. More blood means more blood flow and that’s another way of boosting your long-term heath.