Layman, but I imagine if your blood is flowing to fast doesn't help much the lungs have certain diffusion rates, the waste products wouldn't be increased becaus

Layman, but I imagine if your blood is flowing to fast doesn't help much the lungs have certain diffusion rates, the waste products wouldn't be increased because your not doing as much work. There is probably an optimal point where anymore just doesn't really matter. I beat there is some psychological factors to thought you don't have a beat or pulse that is probably unsettling