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Post-exercise rehydration in man: effects of electrolyte addition to ingested fluids
R J Maughan1, J H Owen, S M Shirreffs
1University Medical School, Foresterhill, Aberdeen, Scotland.
Summary
Adding electrolytes to rehydration fluids after exercise significantly improves water balance. Glucose-only solutions lead to greater fluid loss and negative balance compared to electrolyte-containing drinks.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Hydration Science
Background:
- Exercise-induced dehydration impairs water balance.
- Rehydration strategies are crucial for athletes' recovery.
- The role of electrolyte content in rehydration fluids requires further investigation.
Purpose of the Study:
- To investigate the impact of different electrolyte compositions in rehydration fluids on water balance post-exercise.
- To compare the efficacy of glucose-only solutions versus electrolyte-containing solutions for rehydration.
Main Methods:
- Eight healthy males underwent exercise-induced dehydration (approx. 2% body mass loss).
- Subjects ingested one of four randomized drinks: glucose-only, sodium chloride, potassium chloride, or a combination of glucose and electrolytes.
- Plasma volume, serum electrolytes, urine output, and fluid balance were monitored.
Main Results:
- Plasma volume expansion was similar across all treatments.
- Serum electrolyte concentrations transiently decreased then returned to baseline.
- The glucose-only drink resulted in significantly greater cumulative urine output and net negative fluid balance compared to electrolyte drinks.
- Urine osmolality was lowest after the glucose-only drink.
Conclusions:
- Electrolyte-containing fluids are more effective than glucose-only solutions for promoting positive water balance after exercise-induced dehydration.
- The addition of sodium chloride and/or potassium chloride aids in reducing urine output and improving overall fluid retention.