End-diastolic volume is decreased during exercise because of the increased heart rate.

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End-diastolic volume (EDV) refers to the amount of blood in the ventricles at the end of diastole, or the filling phase of the cardiac cycle. During exercise, the sympathetic nervous system stimulates the heart to beat faster and harder, which increases cardiac output. As a result, more blood is ejected from the ventricles with each beat and there is less time between beats for the ventricles to fill. This results in a decrease in end-systolic volume (ESV), the amount of blood remaining in the ventricles after contraction, but not necessarily a decrease in EDV. In fact, EDV can increase during exercise due to the increased venous return, or the amount of blood returning to the heart from the veins, which can stretch the ventricles and increase their filling capacity.

End-Diastolic Volume Is Decreased During Exercise Because of the Increased