2026-06-27T13:55:53Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1296772026-01-09T01:17:02Zcom_20.500.14352_14col_20.500.14352_15

Garnacho Castaño, Manuel Vicente Sánchez Nuño, Sergio Molina Raya, Lorena Carbonell, Teresa Maté Muñoz, José Luis Pleguezuelos Cobo, Eulogio Serra Paya, Noemi 2026-01-08T18:22:13Z 2026-01-08T18:22:13Z 2022-06-11 Garnacho-Castaño, M.V., Sánchez-Nuño, S., Molina-Raya, L. et al. Circulating nitrate-nitrite reduces oxygen uptake for improving resistance exercise performance after rest time in well-trained CrossFit athletes. Sci Rep 12, 9671 (2022). https://doi.org/10.1038/s41598-022-13786-x 10.1038/s41598-022-13786-x https://hdl.handle.net/20.500.14352/129677 https://doi.org/10.1038/s41598-022-13786-x This study aimed to determine the effects of circulating nitrate plus nitrite (NOx) concentrations on resistance exercise performance, VO2 and biomarkers of muscle damage. Eleven well-trained male CrossFit athletes (29.2 +/- 3.7 years, 78.9 +/- 5.4 kg, 175.1 +/- 6.3 cm) carried out a resistance exercise test after drinking 140 mL of beetroot juice (BJ) or placebo. The test consisted of repeating the same resistance exercise routine twice: wall ball shots plus full back squat with 3-min rest (1st routine) or without rest (2nd routine) between the two exercises. Higher NOx plasma levels were verified after BJ than placebo in the pretest and post-test (p < 0.001). A higher number of repetitions was observed after BJ intake compared to placebo in the full back squat exercise during the first routine (p = 0.004). A significantly reduced VO2 was detected after BJ intake compared to placebo during rest and full back squat execution in the first routine (p < 0.05). Plasma myoglobin concentrations were significantly increased with BJ compared to placebo (p = 0.036). These results showed that plasma NOx levels reduced VO2 after BJ intake during rest time. These reduced VO2 was a key factor for improving full back squat performance during the first routine. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International Circulating nitrate-nitrite reduces oxygen uptake for improving resistance exercise performance after rest time in well-trained CrossFit athletes journal article