Exercise-related heat exhaustion is an illness caused by getting too hot when you exercise. During heat exhaustion, your body temperature rises above normal.
Heat exhaustion is a condition that develops during prolonged exposure to heat. It is more likely to occur during strenuous activity, such as exercise or manual labor.
After age 65, your body can't adjust to changes in air temperature--especially heat--as quickly as it did when you were younger. That puts you at risk for heat-related illnesses.