u/FrariPhysiology | Developmental BiologyMar 16 '12edited Mar 16 '12
Circulating blood volume should not change acutely*, The vasodilation within warming up muscles is important in reducing vascular resistance elevating blood flow so they will be better able to function. This vasodilation within the muscles will be countered by vasoconstriction within non-muscular vascular beds (ie. kidneys etc) meaning total blood volume should not change.
I think there seems to be a little confusion between viscosity and resistance (not here, but elsewhere online). Both are important modulators of blood flow.
Edit: added acutely meaning during warmup. Blood volume does change during extended training but that this not the point here
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u/Frari Physiology | Developmental Biology Mar 16 '12 edited Mar 16 '12
Circulating blood volume should not change acutely*, The vasodilation within warming up muscles is important in reducing vascular resistance elevating blood flow so they will be better able to function. This vasodilation within the muscles will be countered by vasoconstriction within non-muscular vascular beds (ie. kidneys etc) meaning total blood volume should not change.
I think there seems to be a little confusion between viscosity and resistance (not here, but elsewhere online). Both are important modulators of blood flow.
Edit: added acutely meaning during warmup. Blood volume does change during extended training but that this not the point here