Do not automatically replace 100% of this value. Repeat the test and avoid drinking enough to gain body mass.
Estimate sweat rate from a field test using body-mass change, fluid intake, urine loss, and exercise duration. Repeat tests in similar conditions and avoid drinking enough to gain body mass.
Use pre/post body mass, fluid consumed, urine produced, and test duration to estimate observed fluid loss per hour. The result describes one field test and should not be converted automatically into a 100% replacement prescription.
Estimated sweat loss in milliliters equals body-mass decrease in kilograms multiplied by 1,000, plus fluid consumed, minus urine produced. Divide that result by test duration in hours to obtain the hourly reference.
Sweat rate can vary with heat, humidity, intensity, acclimation, clothing, and the athlete. A result from one cool easy session should not be assumed to represent a hot race. Repeat comparable tests and retain the conditions beside each value.
The body-mass band is descriptive, not a diagnosis or readiness score. Drinking enough to replace every measured milliliter is not automatically appropriate, and drinking enough to gain body mass should be avoided. Individual medical needs require qualified guidance.
((Pre-weight − post-weight) × 1,000 + fluid intake − urine loss) ÷ duration in hours. Weight is stored in kilograms and fluid in milliliters before display conversion.
Not automatically. The result is a measurement reference from one session, not an individualized replacement prescription. Repeat the test and avoid plans that cause body-mass gain.
Environment, intensity, acclimation, clothing, duration, measurement technique, and normal day-to-day variation can all change the observed result.