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As a consequence, the blood pressure usually increases by 20 to 60 mm Hg, which helps sustain the increased blood flow through skeletal muscle blood vessels. In response to sympathetic stimulation, some decrease in the blood flow through the skin can occur at the beginning of exercise. However, as the body temperature increases in response to the increased muscular activity, temperature receptors in the hypothalamus are stimulated. As a result, action potentials in sympathetic nerve fibers causing vasoconstriction decrease, resulting in vasodilation of blood vessels in the skin.
this may help endurance athletes she said but it will not make them feel warmer however she said our body s ability to control temperature or thermo regulate does involve blood circulation in the cold the small blood vessels on the surface of our body get smaller to keep warm blood deeper inside in the heat they dilate to release heat from the body if you have been in a warm climate for a long time and return to a cold one it may take a little longer for your circulation to adjust