water is an essential part of your blood...when you drink you get dehydrated(pee out lots o' water)...thus have a lower blood volume...the natural reflex (reflex tachycardia) of your body is to increase your heart rate to get the lower volume of blood to the places you need it....thats why after you drink some water you eventually notice your heart rate slow....p.s. the fastest way to increase blood volume is to eat some salt and drink water since water follows sodium (don't eat A LOT of salt and don't do it if you are on a low salt diet by your doc!!!)....this is a good thing to know though if you are ever in a situation where someone has lost a lot of blood through hemorrhage...carry some salted crackers and water
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