Why does a shortened diastole lead to reduced blood flow to the periphery?

Diastole shortening leads to reduced blood flow to the periphery, typically due to decreased filling time of blood within the ventricles, resulting in a reduced volume of blood ejected into the systemic circulation with each cardiac contraction. The detailed explanation is as follows:

Diastole is the phase when the heart muscle relaxes and dilates, during which the ventricular chamber volume increases and cardiac filling improves. During diastole, the heart relaxes, causing a decrease in intraventricular pressure. Blood flows from the ventricles into the arteries, creating a low-pressure zone in the arteries. This causes peripheral capillaries to expand, increasing blood flow volume, slowing blood flow velocity, and expanding the distribution range of blood, thereby enhancing peripheral blood flow. In contrast, during systole, cardiac muscles contract, increasing intraventricular pressure and forcing blood out of the heart. This creates a high-pressure zone within the blood vessels, leading to capillary constriction, reduced blood volume flow, faster blood flow velocity, and a narrower distribution range, thus reducing peripheral blood flow. Therefore, shortening of diastole reduces the time available for ventricular filling, decreasing the amount of blood ejected into systemic circulation with each heartbeat and ultimately reducing peripheral blood flow.

If patients experience cardiac or general physical discomfort, they should promptly seek medical attention at a hospital to complete relevant examinations and cooperate with doctors for targeted treatment.