Resumen

El objetivo fue analizar los efectos de la suplementación con zumo de remolacha (ZR) sobre el rendimiento deportivo en triatletas amateur, medido mediante un protocolo de media sentadilla bilateral y unilateral, y con una prueba de salto con contramovimiento (CMJ), en situación de fatiga. Doce triatletas amateurs participaron en este estudio aleatorizado, a doble ciego y con un diseño cruzado compuesto por dos sesiones de evaluación que consistían en un test incremental hasta la extenuación ejecutado entre dos CMJ y dos pruebas de media sentadilla con 30 y 40 kg de manera bilateral y unilateral. La intervención nutricional consistía en ingerir 140 mL de ZR o placebo 2,5 h antes de la prueba. La suplementación con ZR mejoró el consumo máximo de oxígeno (VO₂max) absoluto (p = 0,033) y relativo (p = 0,011) obtenido en la prueba incremental en comparación con placebo (4,12 ± 0,70 vs. 3,72 ± 0,90 ml·kg·min^-1 y 54,82 ± 7,72 vs. 44,48 ± 15,84 ml·kg·min^-1). Por otro lado, no se encontró una interacción significativa (p > 0,05, n²p = 0,03-0,30) para ninguna de las variables estudiadas en relación con el rendimiento bilateral y unilateral en media sentadilla ni CMJ entre la condición (placebo y ZR) y el tiempo (antes, PRE y después, POST). Estos resultados ponen de manifiesto que la suplementación con ZR ayuda a exhibir un mayor VO₂max en triatletas amateurs pero no reduce la fatiga en comparación con la condición de placebo.

Abstract

The aim was to analyze the effects of beetroot juice supplementation (BJ) on sports performance in amateur triathletes, measured using a bilateral and unilateral half squat protocol, and a contramovement jump (CMJ), fatigue situation. Twelve amateur triathletes participated in this randomized, double-blind, crossover design consisting of two evaluation sessions consisting of an incremental test until exhaustion performed between two CMJs and two half-squat tests with 30 and 40 kg. bilateral and unilateral loading. The nutritional intervention consisted of taking 140 mL of BJ or placebo 2.5 h before the test. BJ supplementation improved absolute (p = 0,033) and relative (p = 0,011) oxygen uptake (VO₂max) in incremental test in comparison to placebo. (4,12 ± 0,70 vs. 3,72 ± 0,90 ml·kg·min^-1 y 54,82 ± 7,72 vs. 44,48 ± 15,84 ml·kg·min^-1). On the other side, no significant interaction (p > 0,05, n²p = 0,03-0,30) was found for any of the variables studied in relation to bilateral and unilateral performance in half squat or CMJ between the condition (placebo and BJ) and time (before, PRE and after, POST). These results show that supplementation with BJ helps to exhibit greater VO₂max in amateur triathletes but does not reduce fatigue compared to the placebo condition.

https://doi.org/10.5232/ricyde2022.06701

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