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Nutrients 2018, 10(9), 1222; https://doi.org/10.3390/nu10091222

Effects of Beetroot Juice Supplementation on Performance and Fatigue in a 30-s All-Out Sprint Exercise: A Randomized, Double-Blind Cross-Over Study

1
GRI-AFIRS, Escuela de Ciencias de la Salud, TecnoCampus-Universidad Pompeu Fabra, Mataró, 08005 Barcelona, Spain
2
Faculty of Health Sciences, University Alfonso X El Sabio, 28691 Madrid, Spain
3
Department of Education Sciences, University of Alcalá, 28805 Alcalá de Henares, Spain
4
Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, University of Alcalá, 28805 Alcalá de Henares, Spain
5
Investigation Group Valornut, Department of Nutrition, Faculty of Pharmacy, University Complutense de Madrid, 28691 Madrid, Spain
6
Studies Research Group in Neuromuscular Responses (GEPE N), University of Lavras, 37200-000 Lavras, Brazil
7
Faculty of Health Sciences, University Isabel I, 09004 Burgos, Spain
*
Author to whom correspondence should be addressed.
Received: 3 August 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 4 September 2018
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Abstract

As a nitric oxide precursor, beetroot juice (BJ) is known to enhance high-intensity exercise performance (80–100% VO2max) yet its impacts on higher intensity sprint exercise (>100% VO2max) remain to be established. This study sought to examine the effects of BJ supplementation on performance and subsequent fatigue during an all-out sprint exercise. Using a randomized cross-over, double-blind, placebo-controlled design, 15 healthy resistance-trained men (22.4 ± 1.6 years) ingested 70 mL of either BJ or placebo. Three hours later, participants undertook a 30-s all-out Wingate test. Before and after the sprint exercise and at 30 s and 180 s post-exercise, three countermovement jumps (CMJ) were performed and blood lactate samples were obtained. Compared to placebo, BJ consumption improved peak (placebo vs. BJ, 848 ± 134 vs. 881 ± 135 W; p = 0.049) and mean (641 ± 91 vs. 666 ± 100 W; p = 0.023) power output and also reduced the time taken to reach Wpeak in the Wingate test (8.9 ± 1.4 vs. 7.3 ± 0.9 s; p = 0.003). No differences were detected in the fatigue index. In addition, while over time CMJ height and power diminished (ANOVA p < 0.001) and blood lactate levels increased (ANOVA p < 0.001), no supplementation effect was observed. Our findings indicate that while BJ supplementation improved performance at the 30-s cycling sprint, this improvement was not accompanied by differences in fatigue during or after this type of exercise. View Full-Text
Keywords: nitric oxide; nitrates; muscle power; muscle fatigue nitric oxide; nitrates; muscle power; muscle fatigue
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Cuenca, E.; Jodra, P.; Pérez-López, A.; González-Rodríguez, L.G.; Fernandes da Silva, S.; Veiga-Herreros, P.; Domínguez, R. Effects of Beetroot Juice Supplementation on Performance and Fatigue in a 30-s All-Out Sprint Exercise: A Randomized, Double-Blind Cross-Over Study. Nutrients 2018, 10, 1222.

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