RSA Breathing (Respiratory sinus arrhythmia) Since RSA breathing tends to stimulate the vagus nerve, which pushes you into parasympathetic mode–and is the pair of the cranial nerves that connects the brain to the abdomen via the heart, esophagus and lungs, it prepares the body to participate more effectively in these parasympathetic maintenance functions. It also reduces autonomic stress, so doing it multiple times during the day creates points in the stress graph which produce drops, breaking up the steady climb, […]