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Appl Physiol Nutr Metab. 2019 Jan;44(1):90-94. doi: 10.1139/apnm-2018-0277. Epub 2018 Jul 9.

Effect of beetroot juice supplementation on 10-km performance in recreational runners.

Author information

1
a Post-graduate Program of Physiological Sciences, Department of Physiological Sciences, State University of Maringá, 87020-900 Maringá-PR, Brazil.
2
b Associate Post-graduate Program in Physical Education UEM/UEL, Department of Physical Education, State University of Maringá, 87020-900 Maringá-PR, Brazil.

Abstract

The purpose of this study was to investigate the effects of chronic beetroot juice (BRJ) supplementation on 10-km running performance in recreational runners. In a double-blind, placebo-controlled, crossover-designed study, 14 male recreational runners (age, 27.8 ± 3.4 years) performed three 10-km running tests, at baseline and under the conditions of BRJ supplementation and placebo (PLA). Supplementation was administered for 3 days, and on the days of the assessments, the ingestion occurred 2 h before the test and consisted of a dose of 420 mL of BRJ in natura (8.4 mmol inorganic nitrate (NO3-)·day-1) or PLA with depleted NO3- (0.01 mmol NO3-·day-1). The mean velocity (MV) was calculated, and the following variables were determined: maximal heart rate, maximal rating of perceived exertion, blood glucose concentration (analyzed before and after the test), and lactate peak. There was no main effect between conditions regarding 10-km running time performance (BRJ: 50.1 ± 5.3 min; PLA: 51.0 ± 5.1 min; P = 0.391) and total MV (BRJ: 12.1 ± 1.3 km·h-1; PLA: 11.9 ± 1.2 km·h-1; P = 0.321) or in the other analyzed variables. The time to complete the first half of the test (5 km) was statistically lower in the BRJ group than in the PLA group (P = 0.027). In conclusion, chronic supplementation with BRJ increased MV in the first half of the test and improved the final test times of 10 of the 14 runners, although we did not find a statistically significant difference in the performance of the 10-km run.

KEYWORDS:

course; endurance physique; exercise nutritional science; nitrate supplementation; nitric oxide; nutrition de l’exercice; oxyde nitrique; physical endurance; running; supplémentation en nitrate

PMID:
29986146
DOI:
10.1139/apnm-2018-0277

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