Under moderate conditions the body automatically adjusts itself to keep its temperature within safe limits. Sweating is the body's most efficient means of getting rid of heat, but the more humid the air, the harder it is for sweat to evaporate and the harder it is for the body to cool off. Under hot and humid conditions, work becomes harder because much of our blood is going to the surface of the body, and less is available to the active muscles. Loss of salt from sweating can result in fatigue.
