04HYDRATION · FIELD TEST

Measure sweat rate from a real session.

FIELD-TEST INPUTS

Record what actually happened.

Repeat the test across different temperatures, intensities and sports. One result is a measurement of one session—not a permanent personal constant.

MEASURED RESULT

0.88 L/hour

Estimated sweat loss1.10 L
Body-mass change0.8%0.60 kg
Observed fluid replacement45%
CALCULATION

(72.4 kg − 71.8 kg + 0.50 L − 0.00 L) ÷ 1.25 h

Warm, steady run · 26°C
THE NUMBER IS THE START

Put the result in the context of your training.

Form connects sessions, goals, recovery and constraints so the next decision is about more than one calculator.

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