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

Authors
  • Lee, Seungyong
  • Abel, Mark G
  • Thomas, Travis
  • Symons, T Brock
  • Yates, James W
Type
Published Article
Journal
Journal of exercise nutrition & biochemistry
Publication Date
Mar 31, 2019
Volume
23
Issue
1
Pages
55–62
Identifiers
DOI: 10.20463/jenb.2019.0008
PMID: 31010275
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

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. 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. 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. 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. ©2019 The Korean Society for Exercise Nutrition.

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