This is known as “cold shock”. As a result, the sympathetic nervous system is activated and hormones, such as adrenaline, and Nora, Pennell, friend and endorphins are released. When the hormones are released at the same time as the respiratory and heart rate increases, it gives a feeling of euphoria and pleasure.

This experience can make you feel happier, more fit, have less aches, and better ability to cope with stress. It also protects against oxidative stress, increases antioxidants in the body has positive affects on blood pressure and the immune system.