Determining a "do not start" temperature for a marathon on the basis of adverse outcomes

Medicine and Science in Sports and Exercise
William O Roberts

Abstract

Marathon races faced with unexpectedly hot conditions must make a decision to start or not to start. The current race cancellation parameters may not reflect the safety profile of an individual race, and a universal temperature may not work an individual race. A retrospective review of the number of starters, finishers, and finish line medical encounters was used to calculate the rate of "unsuccessful" marathon starters from race records, where unsuccessful is defined as medical encounters seen for any reason in the finish medical area plus marathon starters who did not finish. Unsuccessful marathon starters were plotted against the race start wet bulb globe temperature (WBGT), and the WBGT level at which a mass casualty incident (MCI) occurred was used to calculate a "do not start" WBGT. A start WBGT of >21 degrees C resulted in MCI or midrace cancellation in several races. Twin Cities Marathon data show a rapid increase in the rate of unsuccessful marathoner starters above a start WBGT of 13 degrees C. The event experienced an area-wide MCI at a start WBGT of 22 degrees C with an unsuccessful starter rate of 160 per 1000 finishers. Marathons in northern latitudes (>40 degrees) held in "unexpectedly" hot conditions when the pa...Continue Reading

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