A single dose of beetroot juice enhances cycling performance in simulated altitude

David J Muggeridge, Christopher C F Howe, Owen Spendiff, Charles Pedlar, Philip E James, Chris Easton

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

INTRODUCTION: Increasing nitric oxide bioavailability via supplementation with nitrate-rich beetroot juice (BR) has been shown to attenuate the negative effect of hypoxia on peripheral oxygen saturation and exercise tolerance. PURPOSE: We investigated the effects of a single dose of concentrated BR on the physiological responses to submaximal exercise and time trial (TT) performance in trained cyclists exposed to moderate simulated altitude (approximately 2500 m). METHODS: Nine competitive amateur male cyclists (age, 28 ± 8 yr; V⋅O2peak at altitude, 51.9 ± 5.8 mL·kg·min) completed four exercise trials consisting of an initial graded test to exhaustion and three performance trials on a cycle ergometer. The performance trials comprised 15 min of submaximal steady-state exercise at 60% maximum work rate and a 16.1-km TT. The second and third trials were preceded by ingestion of either 70 mL of BR or nitrate-depleted BR (PLA) 3 h before exercise. RESULTS: Plasma nitrate (PLA, 39.1 ± 3.5 µM; BR, 150.5 ± 9.3 µM) and nitrite (PLA, 289.8 ± 27.9 nM; BR, 678.1 ± 103.5 nM) measured immediately before exercise were higher after ingestion of BR compared with that after PLA (P < 0.001, P = 0.004). V?O2 during steady-state exercise was lower in the BR trial (2542 ± 114 mL·min) than that in the PLA trial (2727 ± 85 mL·min, P = 0.049). TT performance was significantly faster after BR (1664 ± 14 s) than that after PLA (1702 ± 15 s, P = 0.021). CONCLUSION: A single dose of BR lowered V⋅O2 during submaximal exercise and enhanced TT performance of trained cyclists in normobaric hypoxia. Consequently, ingestion of BR may be a practical and effective ergogenic aid for endurance exercise at altitude.

Original languageEnglish
Pages (from-to)143-150
Number of pages8
JournalMedicine and Science in Sports and Exercise
Volume46
Issue number1
DOIs
Publication statusPublished - 31 Jan 2014

Keywords

  • altitude
  • nitrates
  • athletic performance
  • beta vulgaris
  • bicycling
  • nitrites
  • dietary supplements
  • oxygen consumption
  • plant preparations

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