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Changes in cardiac output during exercise increase blood cycling rate up to 21 L per minute in active individuals and 35 L per minute in elite athletes. Heart health and exercise performance are regulated by your cardiac output ability.
Both epinephrine and norepinephrine increase heart rate. During a bout of exercise, epinephrine exerts a significant vasodilatory effect on the blood vessels associated with the skeletal muscles. Corticosteroids, including cortisol, also have an effect on blood pressure. Without the presence of cortisol, the influence of epinephrine and norepinephrine upon vascular responses is minimized (Drew and Leach, 1971). Therefore, cortisol facilitates the action of the catecholamines.