Acknowledgement
The authors express their gratitude to the participants of the experiment. No funding was received for this study. This study was submitted in partial fulfillment of the requirements for the degree of Master of Science.
DOI QR Code
Acute beetroot juice supplementation does not attenuate knee extensor exercise muscle fatigue in a healthy young population
- Lee, Seungyong (Department of Pathology, Johns Hopkins University School of Medicine) ;
- Abel, Mark G. (Department of Kinesiology and Health Promotion, University of Kentucky) ;
- Thomas, Travis (College of Health Sciences, University of Kentucky) ;
- Symons, T. Brock (Department of Health & Sports Sciences, University of Louisville) ;
- Yates, James W. (Department of Kinesiology and Health Promotion, University of Kentucky)
- Received : 2019.02.12
- Accepted : 2019.03.26
- Published : 2019.03.31
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.