Dietary nitrate fails to improve 1 and 4 km cycling performance in highly trained cyclists
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.
© Copyright 2017 Journal of the International Society of Sports Nutrition. Taylor & Francis. Kaikki oikeudet pidätetään.
Aiheet: | pyöräily kestävyyslajit keskipitkä kestävyys pitkäkestoinen kestävyys ravitsemus suhde suorituskyky lisäravinteiden käyttö ruoansulatus kuormitus uupumus |
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Aihealueet: | biologiset ja lääketieteelliset tieteet kestävyys urheilu |
Tagging: | Nitrat |
DOI: | 10.1123/ijsnem.2016-0212 |
Julkaisussa: | Journal of the International Society of Sports Nutrition |
Julkaistu: |
2017
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Vuosikerta: | 27 |
Numero: | 3 |
Sivuja: | 255-263 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |