I think it makes sense you would be able to enter deeper states of relaxation. I've heard in animal studies they've shown that if you disable the parasympatheti

I think it makes sense you would be able to enter deeper states of relaxation. I've heard in animal studies they've shown that if you disable the parasympathetic nerve into the heart then it just beats a constant, quite high rate. Marathon runners have considerably lower resting heart rate. It seems to be the parasympathetic nervous system acts as a brake that pumps on an off (connected to inhalation/exhalation) to keep it lower than it's default max speed. So that it's constantly lower means more parasympathetic bias?