It measures overnight changes in oxygen level in the blood, called oxygen saturation, together with changes in peripheral arterial tone, the degree of blood vessel constriction in the fingers, in response to breathing disruptions. (sciencedaily.com)
Poor dietary habits and a lack of exercise greatly increase the risk of blood vessel constriction — which is often increased in overweight and obese adults... Read More» (naturalhealth365.com)
Activation of this system increases blood vessel constriction, which can contribute to arterial stiffness. (sciencedaily.com)