10 years ago
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The Science (and Strategy) Behind Sweating
Don't let the summer swelter put a damper on your training efforts - it's time to get serious about your hydration.
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"When the humidity is high, the evaporation process is suppressed, increasing your risk of overheating."
This, I did not know. I live in KC, so it gets crazy humid here and when I go on a run, I do feel excessively hot on those days when the humidity is at its highest, even lightheaded sometimes. I guess I need to listen to my body more.
If you're curious as to why that is, the Wikipedia articles on evaporation and vapor pressure are a good start. Basically, liquid water and water vapor will reach an equilibrium once water vapor makes up a certain proportion of the surrounding air. High humidity indicates that the air's water vapor content is at or near that equilibrium point for the current temperature.