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 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
- Intake measured by
- Not stated
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2011-04-07 · Med Sci Sports Exerc · vol. 43 · issue 6 · pp. 1125–1131
- Publisher
- Lippincott Williams & Wilkins
- Cited
- 387 citations · more than 100% of similar papers · 16.7× the field average
- Impact
- Top 10% most cited in its field
- References
- 43 works
- Access
- Paywalled
- Research areas
- Nitric Oxide and Endothelin Effects · Exercise and Physiological Responses · Muscle metabolism and nutrition
- Keywords
- 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 authors
From GB
- Katherine E. LansleyUniversity of Exeter
- Paul Graham WinyardUniversity of Exeter; Peninsula College of Medicine and Dentistry
- Stephen J. BaileyUniversity of Exeter
- Anni VanhataloUniversity of Exeter
- Daryl Paul WilkersonUniversity of Exeter
- Jamie R. BlackwellUniversity of Exeter
Abstract
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.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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