title: Dietary Nitrate Fails to Improve 1 and 4 km Cycling Performance in Highly Trained Cyclists.
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.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: McQuillan
authors.forename: Deborah K
authors.initials: DK
authors.lastname: Dulson
authors.forename: Paul B
authors.initials: PB
authors.lastname: Laursen
authors.forename: Andrew E
authors.initials: AE
authors.lastname: Kilding
mesh_terms: D000328:Adult; D056352:Athletes; D054874:Athletic Performance; D027461:Beta vulgaris; D001642:Bicycling / Q000502:physiology*; D018592:Cross-Over Studies; D019587:Dietary Supplements; D004311:Double-Blind Method; D000067030:Fruit and Vegetable Juices; D006801:Humans; D008297:Male; D009566:Nitrates / Q000008:administration & dosage*; D009569:Nitric Oxide / Q000097:blood; D010101:Oxygen Consumption; D064133:Sports Nutritional Physiological Phenomena; D055815:Young Adult
chemical_list: D009566:Nitrates; D009569:Nitric Oxide
keywords: beetroot juice; exercise economy; nutrition; time-trial