Humidity and Performance

Elevated humidity impairs evaporative heat loss and self-paced exercise performance in the heat (Bright et al).pdf (345.1 KB)

This was way more impact than I thought it would be. 16%?

Can’t say I’m surprised here in Florida. The bright side is we get that heat acclimation training bonus.

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Yeah. If it’s humid enough, there’s no evaporative cooling from sweat. I lived in NV for many years with single digit humidity. Never got wet from sweat. Just got a salt crust. Sweat was evaporating faster than I could produce it. Like they say, “Yes, it’s hot, but it’s a dry heat.”

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16% maybe seems maybe a bit high but the participants were also ‘non-heat acclimatized’ so that sounds about right. Going from 50% humidity to 90% is a big difference.

Idk if it would cause me to do 50W less over ~45-60m but maybe 30 (trying to normalize it to my 335W FTP)?. But especially self paced, if they didn’t have their power in front of them and just going off RPE then that makes more sense too. Overheating feels awful.

Even just doing endurance on the trainer with no fans feel pretty terrible after like 30min.

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