Usually, many people like to take a hot (cold) bath immediately after exercise, thinking that this can not only decontaminate, but also restore fatigue. In fact, the body has not returned to normal after exercise, so it is not appropriate to take a bath immediately, especially a hot bath.

According to the research of sports medicine experts, when people exercise, the blood flowing to muscles increases and the heart rate accelerates. When exercise stops, blood flow and heart rate will be relieved, but it will last for a long time. If you take a bath immediately, it will increase the blood flow to your skin and muscles. In this way, the remaining blood is not enough to supply other important organs, such as the heart and brain, which leads to heart disease.

Some people take a hot bath after exercise, and then often feel dizzy and weak, which is the reason mentioned above. Especially the elderly or obese, you can't take a hot bath immediately after exercise.

You can't take a cold bath immediately after sweating in summer, because the temperature is high in summer and the body generates more heat during exercise. Evaporation of sweat and vasodilation of skin are important ways to dissipate heat. At the end of exercise, the human body is still in a state of vigorous metabolism, increased heat production and vasodilation of the skin. At this time, if the skin is immediately stimulated by cold water, the blood vessels of the skin will contract through nerve reflex, which will hinder perspiration and heat dissipation, but it will make heat dissipation difficult and body temperature rise. At the same time, the decrease of skin blood flow suddenly increases the blood flow back to the heart, which will increase the burden on the heart. There is also the body from the hot environment into the cold environment, too late to adapt to the adjustment, often easy to catch a cold or cause gastrointestinal cramps. Muscle fatigue and tension increase after exercise, and then cold stimulation may also cause cramps. Drink some salt water properly after sweating in summer, then rest for about 1 hour, do some preparatory activities and take a cold bath. If conditions permit, it is best to take a warm bath.