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Title: Influence of sex and acute beetroot juice supplementation on 2 KM running performance
Keywords: Endurance performance
Ergogenic aid
Nitric oxide
Ratings of perceived exertion
Desempenho de resistência
Ajuda ergogênica
Óxido nítrico
Classificações de esforço percebido
Issue Date: 2021
Publisher: MDPI
Citation: CASADO, A. et al. Influence of Sex and Acute Beetroot Juice Supplementation on 2 KM Running Performance. Applied Science, [S. l.], v. 11, n. 3, 2021. DOI: 10.3390/app11030977.
Abstract: Purpose: To assess the effect of acute nitrate-rich (BJ) and nitrate-depleted (PL) beetroot juice ingestion on 2 km running performance in amateur runners, and to what extent the ergogenic effect of BJ supplementation would be influenced by the sex of the participants; Methods: Twenty-four amateur long-distance runners (14 males and 10 females) performed a 2 km time trial (TT) on an outdoor athletics track 2.5 h after ingesting either 140 mL of BJ (~12.8 mmol NO3−) or PL. After the tests, blood [lactate] and ratings of perceived exertion (RPE) related to the leg muscles (RPEmuscular), cardiovascular system (RPEcardio) and general overall RPE (RPEgeneral) were assessed; Results: Compared to PL, BJ supplementation improved 2 km TT performance in both males (p < 0.05) with no supplement × sex interaction effect (p > 0.05). This improvement in 2 km running performance was a function of improved performance in the second 1 km split time in both males and females (p < 0.05). Supplementation with BJ did not alter post-exercise blood [lactate] (p > 0.05) but lowered RPEgeneral (p < 0.05); Conclusions: acute BJ supplementation improves 2 km running performance in amateur runners by enhancing performance over the second half of the TT and lowering RPEgeneral by a comparable magnitude in males and females.
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