To help visualize vascular stiffness, imagine a garden hose or cooling-water hose—specifically what happens when you turn the water flow on and off. Each time the valve opens or closes, much like with every heartbeat, a pressure surge travels through the hose. Because liquids are virtually incompressible, their volume remains constant under pressure, meaning the hose walls themselves must absorb the force.
Without this elasticity, the cardiovascular system loses its Windkessel function (elastic reservoir function) —its ability to dampen pressure spikes like a flexible reservoir. Without that dampening effect, organs and vessel walls are subjected directly to those elevated peak pressures, forcing the heart to work against greater resistance. Furthermore, the initial pressure wave reflects off the peripheral vascular system and bounces back toward the heart. The heart must then pump against this returning wave. In mechanical terms, it operates like a pump pushing against fluid backflow, impairing efficiency and increasing strain.