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

[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)...

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Detalles Bibliográficos
Autores principales: Lee, Seungyong, Abel, Mark G., Thomas, Travis, Symons, T. Brock, Yates, James W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 한국운동영양학회 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6477801/
https://www.ncbi.nlm.nih.gov/pubmed/31010275
http://dx.doi.org/10.20463/jenb.2019.0008
Descripción
Sumario:[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.