⚡Electrolyte Balance Calculator
Electrolytes (sodium, potassium, magnesium, chloride) are lost in sweat and must be replaced during prolonged exercise. Sodium loss (~920mg/L) is most critical — replacing water without sodium can cause dangerous hyponatraemia.
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Fun Fact
Hyponatraemia (low blood sodium from drinking too much plain water) has killed several marathon runners. "Drink to thirst" is now the evidence-based guideline — not "drink as much as possible."
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