Acute dietary nitrate supplementation improves cycling time trial performance
Lansley KE, Winyard PG, Bailey SJ, Vanhatalo A, Wilkerson DP, Blackwell JR, Gilchrist M, Benjamin N, Jones AM
Medicine and science in sports and exercise · 262 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
- Consumo medido con
- No se indica
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2011-04-07 · Med Sci Sports Exerc · vol. 43 · número 6 · págs. 1125–1131
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 387 citas · más que el 100% de estudios similares · 16.7× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 43 trabajos
- Acceso
- De pago
- Áreas de investigación
- Nitric Oxide and Endothelin Effects · Exercise and Physiological Responses · Muscle metabolism and nutrition
- Palabras clave
- Nitrate, Nitrite, Dietary Nitrate, Animal science, Crossover study, Time trial, Cycling, Placebo, Chemistry, Internal medicine, Medicine, Endocrinology, Biology, Heart rate, Blood pressure
- MeSH
- humans, nitrates, nitrites, cross-over studies, blood pressure, bicycling, beverages, dietary supplements, male, athletic performance, young adult
9 autores
- Katherine E. Lansley🇬🇧University of Exeter
- Paul Graham Winyard🇬🇧University of Exeter; Peninsula College of Medicine and Dentistry
- Stephen J. Bailey🇬🇧University of Exeter
- Anni Vanhatalo🇬🇧University of Exeter
- Daryl Paul Wilkerson🇬🇧University of Exeter
- Jamie R. Blackwell🇬🇧University of Exeter
- Mark Gilchrist🇬🇧University of Exeter; Peninsula College of Medicine and Dentistry
- Nigel Benjamin🇬🇧University of Exeter; Peninsula College of Medicine and Dentistry
- ANDREW MARK JONES🇬🇧University of Exeter
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
Dietary nitrate supplementation has been shown to reduce the O2 cost of submaximal exercise and to improve high-intensity exercise tolerance. However, it is presently unknown whether it may enhance performance during simulated competition. The present study investigated the effects of acute dietary nitrate supplementation on power output (PO), VO2, and performance during 4- and 16.1-km cycling time trials (TT).
Methods
After familiarization, nine club-level competitive male cyclists were assigned in a randomized, crossover design to consume 0.5 L of beetroot juice (BR; containing ∼ 6.2 mmol of nitrate) or 0.5 L of nitrate-depleted BR (placebo, PL; containing ∼ 0.0047 mmol of nitrate), ∼ 2.5 h before the completion of a 4- and a 16.1-km TT.
Results
BR supplementation elevated plasma [nitrite] (PL = 241 ± 125 vs BR = 575 ± 199 nM, P 0.05), but BR significantly increased mean PO during the 4-km (PL = 279 ± 51 vs BR = 292 ± 44 W, P < 0.05) and 16.1-km TT (PL = 233 ± 43 vs BR = 247 ± 44 W, P < 0.01). Consequently, BR improved 4-km performance by 2.8% (PL = 6.45 ± 0.42 vs BR = 6.27 ± 0.35 min, P < 0.05) and 16.1-km performance by 2.7% (PL = 27.7 ± 2.1 vs BR = 26.9 ± 1.8 min, P < 0.01).
Conclusions
These results suggest that acute dietary nitrate supplementation with 0.5 L of BR improves cycling economy, as demonstrated by a higher PO for the same VO2 and enhances both 4- and 16.1-km cycling TT performance.
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