and treat depression. When exposed to cold temperatures, the body rapidly releases norepinephrine into the bloodstream. This neurotransmitter is associated with alertness, attention, concentration, and mood. Several studies, in both mice and humans, have demonstrated that cold exposure increases norepinephrine levels. A study published in the journal Neuropsychiatric Disease and Treatment showed that norepinephrine depletion leads to depression, thus explaining why ice baths and cold showers can help prevent and treat depression.
To obtain these benefits, the temperature must be sufficiently low. One study showed that a one-hour immersion in
