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Acute dietary nitrate supplementation improves dry static apnea performance
Harald K Engan1, Andrew M Jones, Fanny Ehrenberg
1Department of Engineering and Sustainable Development, Mid Sweden University, Östersund, Sweden. Harald.Engan@miun.se
Respiratory Physiology & Neurobiology
|May 17, 2012
Summary
Dietary nitrate supplementation, found in beetroot juice, can extend breath-hold duration in trained divers. This nitrate (NO₃⁻) intake may enhance performance by reducing metabolic costs during apnea.
Area of Science:
- Exercise Physiology
- Nutritional Science
- Human Performance
Background:
- Dietary nitrate (NO₃⁻) supplementation is known to lower blood pressure and improve exercise efficiency.
- Potential benefits of nitrate on tissue oxygenation and metabolic rate suggest possible enhancements in apnea duration.
Purpose of the Study:
- To investigate the effects of acute dietary nitrate supplementation on apnea duration and physiological responses in trained apnea divers.
- To determine if nitrate supplementation impacts pre-apnea blood pressure, heart rate, and arterial oxygen saturation during sub-maximal and maximal apneas.
Main Methods:
- A randomized, double-blind, crossover study involving twelve trained apnea divers.
- Subjects ingested beetroot juice (BR; high nitrate) or placebo juice (PL; low nitrate) 2.5 hours before testing.
- Physiological measurements included blood pressure, heart rate, arterial oxygen saturation, and apneic duration during static apnea protocols.
Main Results:
- Beetroot juice (BR) significantly reduced resting mean arterial pressure compared to placebo (PL).
- Arterial oxygen saturation (SaO₂) nadir was higher after sub-maximal apneas with BR compared to PL.
- Maximal apneic duration was significantly increased by 11% with BR supplementation.
Conclusions:
- Acute dietary nitrate supplementation can increase maximal apneic duration in well-trained apnea divers.
- Nitrate supplementation may enhance apnea performance by reducing metabolic costs and improving oxygen utilization.
- Findings suggest potential applications for nitrate in sports performance and possibly medical contexts related to oxygen management.
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