Arterial Pressure

Arterial blood pressure increases during exercise, but the increase is much greater in isometric than in dynamic exercise. During isometric exercise, the blood vessels are clamped shut by sustained contractions, and resistance increases. This leads to anaerobic metabolism and strong stimulation of the muscle chemoreflex. Without the benefits of local vasodilation in isometric muscle contraction, the net effect is an increase total peripheral resistance and arterial pressure.

During dynamic exercise, there may be a small (< 20%) increase in mean arterial pressure. Large increases in cardiac output are accompanied by large decreases in peripheral vascular resistance. Vascular resistance decreases because of local metabolites, causing vasodilation and vasodilation of skin vessels to promote cutaneous blood flow and heat loss. The fact that small increases in arterial pressure occur has also been interpreted as a resetting of the arterial baroreflex. A similar phenomenon may happen in cardiovascular disease, when the arterial baroreflex becomes less effective at reducing pressure in response to baroreceptor stimulation.

Your Heart and Nutrition

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