Acute beetroot juice supplementation did not enhance intermittent running performance in trained rugby players

Ozcan Esen*, Raci Karayigit, Daniel J. Peart

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
45 Downloads (Pure)

Abstract

Purpose: Since the effect of dietary nitrate (NO3-) supplementation on rugby performance is unclear, the aim of the present study was to determine the effect of acute NO3- supplementation, on the modified Yo-Yo intermittent recovery level 1 (IR1) performance test in trained male rugby players.

Methods: In a randomised, counterbalanced, double-blind, placebo-controlled crossover design, 12 trained rugby union players performed two experimental trials three hours after supplementation of either 140 mL NO3- -rich (BRJ; ~12.8 mmol NO3-) or NO3- -depleted (PLA) BRJ. After blood sampling, players performed the modified Yo-Yo IR1 test. Counter movement jumps (CMJ) were also measured before (pre-CMJ) and after (post-CMJ) the prone Yo-Yo IR1 test.

Results: Plasma NO3- (BRJ: 570 ± 146 µM vs. PLA: 72 ± 23 µM) and nitrite (NO2-) concentrations (BRJ: 320 ± 123 nM vs. PLA: 103 ± 57 nM) were increased after BRJ compared to PLA supplementation (both P < 0.001). Performance in the modified Yo-Yo IR1 test did not differ between BRJ (542 ± 209 m) and PLA (498 ± 185 m, P = 0.3). The jump height in pre-CMJ and in post-CMJ were similar between trials (both P > 0.05).

Conclusions: Acute BRJ supplementation increased plasma NO3- and NO2- concentrations but had no benefit on an intermittent running test that reflects the demands of rugby performance, and CMJ performances. The findings do not support acute high-dose NO3- supplementation as an ergogenic aid to enhance physical performance in trained male rugby players.
Original languageEnglish
Pages (from-to)2321-2328
Number of pages8
JournalEuropean Journal of Sport Science
Volume23
Issue number12
Early online date13 Jul 2023
DOIs
Publication statusPublished - 2 Dec 2023

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