Peter Attia· MD
what's really fascinating is they used to think and this is pretty new research I was going through we used to have this idea that when your heart rate increased above 100 beats per minute that there was really no vagus input there was almost no parasympathetic and and they figure that because they would look at acetyl choline as essentially they could block it into the heart and they' say oh we block acetyl choline from Vegas and heart still pumps just fine during their exercise exercise must not be vasly driven at all but what they found is that the Vegas might actually be turned up a bit during exercise in some sense because it can increase coronary blood flow