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Elite marathon runners are by no means unaccustomed to scorching temperatures, and the enervating effect of both extreme heat and humidity on performance. It only takes a brief glance at their competitive calendar to understand why, yet it demands delving below the surface of physiology and heat acclimation to understand how they outrun the searing sun.
The 2020 Summer Olympics set to take place in sauna-sweltering Tokyo, which has since been postponed to 2021, was predicted to be the hottest on record. So hot in fact, that the 26.2 mile marathon course was resurfaced with a heat-reflecting material called ‘Perfect Cool’. While reducing the surface temperature of the track by up to 10 degrees Celsius on hot days, further analysis found there to be hardly any cooling effect at head height, deeming their heat expelling attempt to be rather futile.

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