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- Sep 13, 2007
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Coffee, caffeine, and other stimulants actually constrict the blood flow. In other words they blood vessels constrict causing you bodies blood pressure to go up. Thats why you feel more energized. more nutrients are getting you your body faster.
these types of stimulants also dramatically raise adrenaline and noradrenaline levels which spike nitric oxide synthase resulting in increased bloodflow to muscle tissue. And the blood vessels they do constrict are not skeletal muscle, is constricts those located around the brain.