Nutrition
Sweat Rate Humidity Factor
Sweat rate humidity factor shows humid air slows evaporation—fluid and electrolyte plans from dry heat tests can underestimate humid races.
The sweat rate humidity factor describes how high humidity slows sweat evaporation—raising skin wetness, heart rate, and perceived heat stress even when air temperature looks moderate. Athletes may lose similar fluid volume but feel worse and drift into cardiac drift faster.
Dry heat tests underestimate humid race needs.
Common questions
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Should you retest sweat rate in humidity?
Yes—run a weigh-in session in humid conditions matching your target race. Dry indoor treadmill data often under-plans fluids for August marathons.
Related terms
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