Participation in endurance events is not without risks.  As the temperature increases so do the risk.  This is particularly true if the runner is not acclimatized to temperature and humidity.  The medical committee is monitoring the weather and will make recommendations regarding risk according to the American College of Sports Medicine (ACSM) guidelines.  The on-course aid stations will be notified of changing weather conditions via 2-Way radio.  We use the Wet Bulb Globe Temperature (WBGT) to guide our decisions regarding participant safety.  The WBGT is a measure of heat stress that in account temperature, humidity, wind speed, sun angle, and cloud cover.  The ACSM guidelines are as follows:

• WBGT <65° F (<18° C) Green Flag:  Collapse can still occur. Decreased risk of hyperthermic and hypothermic collapse
• WBGT 65° F – 72° F (18° C – 22° C) Yellow Flag: Recommend participants at increased risk for heat collapse slow pace. Warn entrants of increased risk of heat collapse.
• WBGT 73° F – 82° F (23° C – 28° C) Red Flag: Recommend participants at increased risk for heat collapse withdraw from race and others slow pace to match conditions.
• WBGT >82° F (>28° C) Black Flag: Cancel or recommend voluntary withdrawal.

If the temperatures are above average (as they are expected to be) the Medical Committee encourages runners to have fun running and not try for a personal best.

Heat Illness Prevention

• Ensure proper acclimatization to heat
• Start the event properly hydrated
• Wear proper clothing for environmental conditions
• Get enough sleep
• Do not exercise with a fever

Fluid replacement

Starting the event well hydrated is paramount.  Runners generally need to consume additional fluids in the week leading up to race day.  It is recommended that the runner drink as thirst dictates.  Runners should follow the drinking patterns they established during training.  Fluids will be available on the course but runners must avoid the temptation to over drink as they may lead to exercise associated hyponatremia, a condition that could be fatal.  Remember drinking fluids will not keep the runner cooler.  Race-day fluid replacement is a very individualized need that is based upon heat, sweat rate, size, gender and pace.   In general, runner should consume 400-800 ml per hour.  Less for slower, smaller athletes exercising in more mild conditions.

LISTEN TO YOUR BODY!!!