Start off strong. Get at least 7 hours of rest the night before the race - sleep deprivation makes it tougher for your body to regulated its temperature.
Lighten up. Wear a tank top and shorts made from wicking material and stick with lighter colored clothes. When air flows over exposed skin, it evaporates sweat, which helps lower body temperature.
Drink responsibly. You only need to drink when you're thirsty. Consuming too much liquid can lead to a condition that causes nausea and vomiting.
Take a break. If you feel faintness dizziness, fatigue, loss of peripheral vision - possible signs of heat exhaustion, step out of the race, lie down and lift your legs higher than your heart. If you feel better, get back in the race, but move at a slower pace.
Most importantly - listen to your body and dial it down if needed.
Info from Shape magazine June 2012.
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