How long can you take a shower after running is related to the amount of exercise and the intensity of exercise, and cannot be generalized. Usually after a short slow run, you can take a bath after resting for about 20 minutes, after a high intensity run, it is recommended to take a bath after resting for 30 minutes, and after a long run, you can take a bath after resting for at least one hour. As a result of long running heart rate will increase, cardiac output increases, blood pressure rises, body temperature rises, the whole body sweat glands in an open state, if this sudden bath, the expansion of sweat glands prone to water residue, so that the sweat pores blocked, can not exclude sweat, easy to cause the body moisture aggravated, easy to catch a cold or lead to skin diseases. At the same time, if the bath water temperature is low, the sudden reduction in temperature will make capillary constriction, resulting in oxygen deprivation of the heart and brain and other important organs, dizziness, panic, and even fainting. Therefore, it is recommended to take sufficient rest after running to make the electrolytes in the body return to normal, and at the same time make the breathing and heart rate return to normal and the dilated blood vessels recover.