👉 Diastoles are a type of measurement used to describe the length of the opening between two points in the body, typically related to the size or shape of the heart. In other words, they measure how much space is left between the opening of the heart's valves and the wall of the lungs. The diastole or open state refers to the time when the heart is at rest, while the diastole or closed state refers to the time when it is actively pumping blood through the body