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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.
Positive adaptations occur in as little as three months of aerobic training. Enhancing cardiac output allows you to maintain lower heart rates during physical activity. For example, at the start of a program you may have a heart rate of 150 beats per minute while running at a 6 mph pace. After three or more months of training increased cardiac output enables you to sustain the same running intensity at a lower heart rate such as 125 beats per minute.