What position would have a higher heart rate and breathing rate and why?

Standing erect: When you lie or sit, your body doesn't have to fight gravity to get blood to your head. When you stand up, it does, and heart rate rises and leg blood vessels tighten to maintain blood flow to your brain. Breathing is less affected. If you have heart failure, breathing and heart rate may rise upon lying down since more blood returns to the heart than it can handle and it backs up into the lungs.