isotonic

/ˌaɪsəˈtɑnɪk/
adjective
  1. Describing a drink or solution that has the same concentration of salts and sugars as the fluids in the human body, used to rehydrate quickly.
    • After the long run, she drank an isotonic sports drink to replace lost electrolytes.
    • Many athletes prefer isotonic beverages because they help the body absorb water faster.
    • Doctors sometimes give patients isotonic saline solution to treat dehydration.
  2. In physiology, describing a muscle contraction where the muscle changes length while the tension stays the same.
    • Lifting a weight involves an isotonic contraction of your biceps.
    • Physical therapists use isotonic movements to help patients rebuild strength.
    • During isotonic exercise, your muscles shorten and lengthen as you move.
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