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Blood Pressure Response to Different Exercise.
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| Submitted: Tue Apr 13 2004
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Blood Pressure Response to Different Exercise In order to increase oxygen availability to working muscles, a number of changes must occur within the cardiovascular system that result in increased blood flow as well as a redistribution of the blood. Increasing either HR or SV elevates Q. This is aided by both sympathetic and hormonal (catecholamine) stimulation which increases HR and contractility. During rest, most of the blood resides in the venous system. With the onset of exercise, there is constriction of the venous system which increases blood return to the heart and in turn increases SV as explained by the Frank-Starling principle. At rest, little blood is delivered to non-working muscles because of arteriole constriction. As muscles increase their activity, energy and oxygen demands are increased which stimulate the local arterioles to dilate and the precapillary sphincters to relax allowing more blood and oxygen into the working muscle. Regulation of the...
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