isotonic

Definition

Having the same osmotic pressure or solute concentration as another solution—typically referring to sports drinks that match your blood's chemistry so your body actually absorbs them. Medical solutions are isotonic when they won't cause your cells to shrivel or explode on contact, which is generally considered desirable. Also describes muscles with equal tension, though that meaning gets way less advertising dollars.

Example Usage

The athlete chose an isotonic sports drink to replenish electrolytes without causing digestive issues during the marathon.

Source: Medical and sports nutrition terminology

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