5 Ways Heat Affects Running Performance

Humidity Hinders Cooling

Relative humidity is the amount of water in the air compared to the theoretical maximum amount of water in the air and it directly influences sweating and cooling.

Remember that the body cools itself with the evaporation of sweat — not the sweating itself. The more humid it is, the more saturated the air becomes with water, and the harder it becomes to evaporate sweat. With less evaporation of sweat, we don’t cool as well. Plus, that sweat remains on the skin, making it seem like you’re sweating more, but you’re not — that’s the lack of evaporation.

The bottom line? As temperature increases exercise costs more energy and you’ll tire sooner.

RELATED: 7 Hot Weather Training Tips


About The Author:

Tawnee Prazak is a certified triathlon coach, exercise scientist and triathlete. Find out more at www.tawneeprazak.com.

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