What happens in stage 2 of cold water immersion?

In stage 2 of cold water immersion, the body begins to adapt to the cold environment. Blood vessels constrict to preserve core body temperature, and the body may experience increased heart rate and blood pressure as it attempts to maintain adequate circulation. Additionally, individuals might feel a heightened sense of alertness and may begin to shiver as the body generates heat. This stage often lasts for several minutes, depending on the water temperature and individual tolerance.