Heat cramps are caused by sweating. Heat cramps are painful involuntary muscle spasms in the arms, legs and mid-section. The cramps are thought to be due to a sodium and potassium imbalance in the muscle. Treatment includes stopping the activity, drinking plenty of water or fluids and electrolyte replacement. Salting food and eating a balanced diet can help restore electrolyte balance.
Heat exhaustion is caused by excessive fluid loss.
Increased sweating, high body temperature, cool wet skin and some lack of coordination are signs of heat exhaustion. To treat heat exhaustion, you must stop all activity, drink lots of water and get medical treatment, or it could lead to heat stroke. Heat stroke is extremely serious and may be fatal. It requires immediate medical attention. Cold Weather Risks Exercise brings about a warming effect, which, consequently, allows people to tolerate colder temperatures.