Dietary Nitrate Fails to Improve 1 and 4 km Cycling Performance in Highly Trained Cyclists
McQuillan JA, Dulson DK, Laursen PB, Kilding AE
International journal of sport nutrition and exercise metabolism · 23 citations
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
- Independent funding
- University or hospital
- Johns Hopkins University
Based on 1 listed funder(s).
Publication
- Published
- 2016-12-20 · Int J Sport Nutr Exerc Metab · vol. 27 · issue 3 · pp. 255–263
- Publisher
- Human Kinetics
- Cited
- 30 citations · more than 98% of similar papers · 10.7× the field average
- Impact
- Top 10% most cited in its field
- References
- 0 works
- Access
- Paywalled
- Research areas
- Cardiovascular and exercise physiology · Pharmacological Effects and Assays · Muscle metabolism and nutrition
- Keywords
- Time trial, Placebo, Cycling, Crossover study, Dosing, Medicine, Animal science, Physical therapy, Internal medicine, Biology, Blood pressure, Heart rate
- MeSH
- humans, beta vulgaris, nitrates, nitric oxide, cross-over studies, double-blind method, oxygen consumption, bicycling, dietary supplements, adult, male, athletic performance, young adult, athletes, sports nutritional physiological phenomena, fruit and vegetable juices
4 authors
- Joseph A. McQuillan
- Deborah K. Dulson
- Paul B. Laursen
- Andrew Edward Kilding
Abstract
We aimed to compare the effects of two different dosing durations of dietary nitrate (NO3-) supplementation on 1 and 4 km cycling time-trial performance in highly trained cyclists. In a double-blind crossover-design, nine highly trained cyclists ingested 140ml of NO3- -rich beetroot juice containing ~8.0mmol [NO3-], or placebo, for seven days. Participants completed a range of laboratory-based trials to quantify physiological and perceptual responses and cycling performance: time-trials on day 3 and 6 (4km) and on day 4 and 7 (1km) of the supplementation period. Relative to placebo, effects following 3- and 4-days of NO3- supplementation were unclear for 4 (-0.8; 95% CL, ± 2.8%, p = .54) and likely harmful for 1km (-1.9; ± 2.5% CL, p = .17) time-trial mean power. Effects following 6- and 7-days of NO3- supplementation resulted in unclear effects for 4 (0.1; ± 2.2% CL, p = .93) and 1km (-0.9; ± 2.6%CL, p = .51) time-trial mean power. Relative to placebo, effects for 40, 50, and 60% peak power output were unclear for economy at days 3 and 6 of NO3- supplementation (p > .05). Dietary NO3- supplementation appears to be detrimental to 1km time-trial performance in highly trained cyclists after 4-days. While, extending NO3- dosing to ≥ 6-days reduced the magnitude of harm in both distances, overall performance in short duration cycling time-trials did not improve relative to placebo.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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