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Rovnováha elektrolytov

⚡Electrolyte Balance Calculator

What is Electrolyte Balance?

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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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How to Electrolyte Balance

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  1. 1Sweat electrolyte content (approximate per litre): Na 920mg · K 200mg · Mg 36mg · Cl 1,400mg
  2. 2Electrolyte loss = Sweat rate (L/hr) × Duration (hr) × Concentration
  3. 3Sodium replacement is most critical for events > 2 hours

Worked Examples

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Example 1
Given:Sweat rate 1.5 L/hr · 3-hour event
Výsledok:Sodium lost: 4,140mg · Potassium: 900mg

Far exceeds typical sports drink replacement

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Did you know?

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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Reviewed October 2026
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