The effect of beetroot juice supplementation on repeat-sprint performance in hypoxia

Georgina L Kent, Brian Dawson, Lars R McNaughton, Gregory R Cox, Louise M Burke, Peter Peeling

Research output: Contribution to journalArticleResearchpeer-review

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Abstract

This investigation assessed the effect of dietary nitrate (NO3-) supplementation, in the form of beetroot juice (BR), on repeat-sprint performance in normoxia and normobaric hypoxia. 12 male team-sport athletes (age 22.3 ± 2.6 y, VO2peak 53.1 ± 8.7 mL.kg-1.min-1) completed three exercise trials involving a 10 min submaximal warm-up and 4 sets of cycling repeat-sprint efforts (RSE; 9 × 4 s) at sea level (CON), or at 3000 m simulated altitude following acute supplementation (140 mL) with BR (HYPBR; 13 mmol NO3-) or NO3-depleted BR placebo (HYPPLA). Peak (PPO) and mean (MPO) power output, plus work decrement were recorded during the RSE task, while oxygen consumption (VO2) was measured during the warm-up. There were no significant differences observed between HYPBR and HYPPLA for PPO or MPO; however, work decrement was reduced in the first RSE set in HYPBR compared with HYPPLA. There was a moderate effect for VO2 to be lower following BR at the end of the 10 min warm-up (ES = 0.50 ± 0.51). Dietary NO3- may not improve repeat-sprint performance in hypoxia but may reduce VO2 during submaximal exercise. Therefore, BR supplementation may be more effective for performance improvement during predominantly aerobic exercise.

Original languageEnglish
Pages (from-to)339-346
Number of pages8
JournalJournal of Sports Sciences
Volume37
Issue number3
Early online date30 Jul 2018
DOIs
Publication statusPublished - 2019
Externally publishedYes

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Exercise
Oxygen Consumption
Oceans and Seas
Athletes
Nitrates
Sports
Placebos
Hypoxia

Cite this

Kent, Georgina L ; Dawson, Brian ; McNaughton, Lars R ; Cox, Gregory R ; Burke, Louise M ; Peeling, Peter. / The effect of beetroot juice supplementation on repeat-sprint performance in hypoxia. In: Journal of Sports Sciences. 2019 ; Vol. 37, No. 3. pp. 339-346.
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The effect of beetroot juice supplementation on repeat-sprint performance in hypoxia. / Kent, Georgina L; Dawson, Brian; McNaughton, Lars R; Cox, Gregory R; Burke, Louise M; Peeling, Peter.

In: Journal of Sports Sciences, Vol. 37, No. 3, 2019, p. 339-346.

Research output: Contribution to journalArticleResearchpeer-review

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