The body secretes adrenaline during exercise. Adrenaline, a type of catecholamine, is a hormone secreted by the adrenal medulla of the body that causes faster breathing, increased heart rate and blood flow, and provides more energy for physical activity. Adrenal medulla activity is innervated by the sympathetic nerves, which are highly activated in the exercise state, and the increased secretion of adrenaline increases skeletal muscle blood flow, heart rate and cardiac contractility, and increases oxygen consumption. So it is said that the body secretes adrenaline during exercise, and prolonged exercise can cause certain changes in catecholamines.