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Dietary nitrate fails to improve 1 and 4 km cycling performance in highly trained cyclists

Lookup NU author(s): Dr Deb DulsonORCiD

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Abstract

© 2017 Human Kinetics, Inc. 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 NO 3 - -rich beetroot juice containing ∼8.0mmol [NO 3 - ], 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 NO 3 - 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 NO 3 - 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 NO 3 - supplementation (p >.05). Dietary NO 3 - supplementation appears to be detrimental to 1km time-trial performance in highly trained cyclists after 4-days. While, extending NO 3 - 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.

Publication metadata

Author(s): McQuillan JA, Dulson DK, Laursen PB, Kilding AE

Publication type: Article

Publication status: Published

Journal: International Journal of Sport Nutrition and Exercise Metabolism

Year: 2017

Volume: 27

Issue: 3

Pages: 255-263

Print publication date: 01/06/2017

Acceptance date: 02/04/2016

ISSN (print): 1526-484X

ISSN (electronic): 1543-2742

Publisher: Human Kinetics Publishers Inc.

URL: https://doi.org/10.1123/ijsnem.2016-0212

DOI: 10.1123/ijsnem.2016-0212

PubMed id: 27997263

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