How does endurance training affect heart function?

Endurance training significantly impacts heart function, particularly by increasing the size of the ventricles. This physiological adaptation occurs because the heart becomes stronger and more efficient with consistent aerobic exercise. As the ventricles grow, they are able to hold more blood, which enhances the volume of blood pumped with each heartbeat—this is known as stroke volume. As a result, individuals engaged in endurance training often experience improved cardiovascular efficiency, allowing them to perform activities with less effort and fatigue.

This adaptation contributes to better overall cardiovascular health and performance, enabling individuals to sustain prolonged physical activity. The heart's ability to pump more blood per beat means that less energy is required to circulate the same amount of blood, ultimately benefiting endurance athletes and those participating in regular aerobic activities.