Sauna hydration, Ireland
For beach cabins, gym saunas and everything in between
A hard sauna session pulls out more fluid and salt than most gym workouts — and plain water puts back only part of it. Set up your session below and we'll show you what you actually lost, and which electrolyte on the market replaces it.
Heat sweat carries sodium at roughly the same concentration as exercise sweat — around 500 to 1,500 mg per litre, depending on the person. Sitting still doesn't give you a discount.
Drinking litres of plain water after a heavy session replaces volume while your sodium stays down. That's the headache, the flatness and the light head an hour later.
Most tablets sit near 300 mg of sodium per serving, tuned for a bottle you sip over an hour of running. After four hard rounds in the heat the arithmetic doesn't reach.
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