What effect does exercise have on endothelial function?

What effect does exercise have on endothelial function?

• A. Exercise increases vascular blood flow and shear rate, which are beneficial for endothelial function.
• B. Exercise reduces endothelial nitric oxide production.
• C. Exercise has no effect on endothelial function.
• D. Exercise increases arterial stiffness.

Answer: (A)

The key idea is that exercise boosts the forces of blood flow on the vessel walls, called shear stress, which endothelium cells detect and respond to. When you exercise, increased blood flow raises shear rate, activating endothelial nitric oxide synthase and raising nitric oxide production. Nitric oxide then relaxes smooth muscle, improving vasodilation and overall endothelial function. Repeated exercise also enhances NO bioavailability and reduces oxidative stress and inflammation, leading to better endothelium-dependent vasodilation, often seen as an improvement in flow-mediated dilation. That’s why exercise improves endothelial function. The other statements miss this mechanism: nitric oxide production is increased, not reduced; exercise does impact endothelial function (not no effect); and regular aerobic exercise tends to reduce arterial stiffness rather than increase it.

The key idea is that exercise boosts the forces of blood flow on the vessel walls, called shear stress, which endothelium cells detect and respond to. When you exercise, increased blood flow raises shear rate, activating endothelial nitric oxide synthase and raising nitric oxide production. Nitric oxide then relaxes smooth muscle, improving vasodilation and overall endothelial function. Repeated exercise also enhances NO bioavailability and reduces oxidative stress and inflammation, leading to better endothelium-dependent vasodilation, often seen as an improvement in flow-mediated dilation. That’s why exercise improves endothelial function.

The other statements miss this mechanism: nitric oxide production is increased, not reduced; exercise does impact endothelial function (not no effect); and regular aerobic exercise tends to reduce arterial stiffness rather than increase it.