Nutrition
Sweat Rate Testing
Sweat rate testing measures fluid loss per hour of exercise to personalize hydration and electrolyte plans. Individual rates vary with heat, fitness, and intensity.
Sweat rate testing estimates fluid loss per hour of exercise by weighing before and after a typical session, accounting for fluids consumed. Results guide hydration and sodium replacement in heat—individual rates vary widely.
Repeat in conditions you race in; one test is not universal forever.
Common questions
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How do you calculate sweat rate?
Weigh nude or minimal clothing before and after exercise, subtract fluid drunk, divide weight loss by hours. One kilogram loss roughly equals one liter sweat.
Related terms
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