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Acute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population.

TitleAcute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population.
Publication TypeJournal Article
Year of Publication2019
AuthorsLee S, Abel MG, D Thomas T, T Symons B, Yates JW
JournalJ Exerc Nutrition Biochem
Volume23
Issue1
Pagination55-62
Date Published2019 Mar 31
ISSN2233-6834
Abstract

PURPOSE: The effect of acute nitrate supplementation on muscle fatigue is largely unknown. This study aimed to evaluate the effect of acute nitrate supplementation on muscle fatigue.

METHODS: Thirty-five recreationally active subjects consumed 140 ml of beetroot (BR) juice (nitrate: 8 mmol·d-1) or placebo (PL) 12 and 2.5 hours before two exercise sessions. Peak torque was measured during 50 repetitions, at maximal effort, and during concentric knee extensions at 90°·s-1. Blood pressure (BP) was recorded pre- and post-exercise.

RESULTS: Peak torque, maximum work, rate of fatigue, and rate of work fatigue were similar between the BR and PL conditions. Post-exercise diastolic BP (BR: 67.2 ± 9.8 vs. PL: 64.5 ± 7.9 mmHg, p < 0.05) and mean arterial pressure (BR: 91.6 ± 9.3 vs. PL: 88.8 ± 8.2 mmHg, p < 0.05) were higher with BR supplementation.

CONCLUSION: These findings suggest that the acute intake of BR juice had no effect on knee extensor muscle strength or fatigue but increased BP in a healthy recreationally active population.

DOI10.20463/jenb.2019.0008
Alternate JournalJ Exerc Nutrition Biochem
PubMed ID31010275
PubMed Central IDPMC6477801