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Glycerol use in hyperhydration and rehydration: scientific update
Medicine and Sport Science
|October 19, 2012
Summary
Glycerol enhances fluid retention for athletes, aiding hyperhydration before exercise and rehydration after. However, athletes must be cautious of low doses detectable by the World Anti-Doping Agency (WADA).
Area of Science:
- Sports Science
- Physiology
- Biochemistry
Background:
- Glycerol ingestion leverages osmotic properties to enhance fluid retention.
- Athletes utilize glycerol for pre-exercise hyperhydration or post-exercise rehydration strategies.
- Previous research indicated performance benefits and no negative impact on running economy.
Purpose of the Study:
- To summarize the physiological effects and practical applications of glycerol in sports.
- To highlight the performance enhancements observed with glycerol-induced hyperhydration and rehydration.
- To address the World Anti-Doping Agency's (WADA) classification of glycerol as a prohibited substance.
Main Methods:
- Review of existing literature on glycerol's physiological effects.
- Analysis of studies investigating glycerol's impact on hydration status and athletic performance.
- Examination of WADA's guidelines regarding glycerol detection in athletes.
Main Results:
- Glycerol ingestion significantly improves fluid retention, aiding both hyperhydration and rehydration.
- Performance metrics such as endurance time and power output have shown improvements.
- The World Anti-Doping Agency (WADA) has prohibited glycerol due to potential masking of doping, with low doses being detectable.
Conclusions:
- Glycerol offers significant benefits for athletic hydration and performance.
- Athletes must be aware of WADA regulations and potential inadvertent intake of glycerol.
- Caution is advised to avoid exceeding WADA's detectable urinary excretion limits.
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