17 Jun '13, 3pm

Running the @ChiMarathon? Here's how heat during the second half could affect your race.

Running the @ChiMarathon? Here's how heat during the second half could affect your race.

Why is starting line temperature so strongly correlated with positive splits, and not with a slower first half split? Unfortunately, the data alone cannot tell us why. A few theories are that people don't adjust their goal times for the warmer weather, and suffer spectacular crashes in the latter half of the race as the temperature catches up to them. Another is that as the temperature rises throughout the day, runners are more affected by the heat in the second half of the race than the (cooler) first. A third theory is the accumulating affects of sweat loss creeping up in the second half of the race, resulting in tiring muscles and cramping.

Full article: http://www.runnersworld.com/races/heat-and-negative-split...

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