jingles....have you had your blood pressure taken when you are sitting and then immediately after you stand?? There is a phenomenon called Orthostatic Hypotension. It is where your blood pressure drops when you change positions from sitting to standing. And to compensate, when your blood pressure drops, your heart works just a little bit harder to continue to pump the same volume of blood as it did before so it increases to make up the difference. Try having your doctor do "orthostatics"...he will know what that is. It could explain the increase in HR trying to compensate for a lower blood pressure.