Acute dietary nitrate supplementation improves dry static apnea performance
Engan HK, Jones AM, Ehrenberg F, Schagatay E
Respiratory physiology & neurobiology · 27 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
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- Resultado principal
- Marcadores de salud y funcionamiento
- Consumo medido con
- Comida provista por los investigadores
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2012-05-12 · Respir Physiol Neurobiol · vol. 182 · número 2-3 · págs. 53–59
- Editorial
- Elsevier BV
- Citado
- 41 citas · más que el 98% de estudios similares · 11.4× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 60 trabajos
- Acceso
- De pago
- Áreas de investigación
- Cardiovascular and exercise physiology · Cardiovascular and Diving-Related Complications · Exercise and Physiological Responses
- Palabras clave
- dietary nitrate, beetroot juice, static apnea, apnea diving, blood pressure, arterial oxygen saturation, heart rate, exercise metabolism, oxygen cost of exercise, acute supplementation
- MeSH
- humans, beta vulgaris, plant roots, apnea, nitrates, vital capacity, exercise, double-blind method, oxygen consumption, exercise tolerance, dietary supplements, adult, female, male
4 autores
- Harald Kåre Engan🇳🇴🇸🇪 · autor de correspondenciaLandsforeningen for hjerte- og lungesyke; Mid Sweden University
- ANDREW MARK JONES🇬🇧University of Exeter
- Fanny Ehrenberg🇸🇪Mid Sweden University
- Erika K. A. Schagatay🇸🇪Mid Sweden University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Acute dietary nitrate (NO₃⁻) supplementation has been reported to lower resting blood pressure, reduce the oxygen (O₂) cost of sub-maximal exercise, and improve exercise tolerance. Given the proposed effects of NO₃⁻ on tissue oxygenation and metabolic rate, it is possible that NO₃⁻ supplementation might enhance the duration of resting apnea. If so, this might have important applications both in medicine and sport. We investigated the effects of acute NO₃⁻ supplementation on pre-apnea blood pressure, apneic duration, and the heart rate (HR) and arterial O₂ saturation (SaO₂) responses to sub-maximal and maximal apneas in twelve well-trained apnea divers. Subjects were assigned in a randomized, double blind, crossover design to receive 70 ml of beetroot juice (BR; containing ∼5.0 mmol of nitrate) and placebo juice (PL; ∼0.003 mmol of nitrate) treatments. At 2.5 h post-ingestion, the subjects completed a series of two 2-min (sub-maximal) static apneas separated by 3 min of rest, followed by a maximal effort apnea. Relative to PL, BR reduced resting mean arterial pressure by 2% (PL: 86±7 vs. BR: 84 ± 6 mmHg; P=0.04). The mean nadir for SaO₂ after the two sub-maximal apneas was 97.2±1.6% in PL and 98.5±0.9% in BR (P=0.03) while the reduction in HR from baseline was not significantly different between PL and BR. Importantly, BR increased maximal apneic duration by 11% (PL: 250 ± 58 vs. BR: 278±64s; P=0.04). In the longer maximal apneas in BR, the magnitude of the reductions in HR and SaO₂ were greater than in PL (P ≤ 0.05). The results suggest that acute dietary NO₃⁻ supplementation may increase apneic duration by reducing metabolic costs.
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