O efeito de dose única do suco concentrado de beterraba sobre desempenho, variáveis bioquímicas e perceptuais, após um protocolo de salto contramovimento

Abstract

Beetroot (Beta vulgaris L.) Rich also inorganic nitrate (NO3-) has been used as a dietary supplement for athletes. Its exogenous action, improve the bioavailability of nitric oxide (NO) in the body, attributed to an improvement in exercise tolerance, lower oxygen consumption and neuromuscular action. Thus, we aimed to evaluate the effectiveness of whole beet juice in performance markers, biochemical and perceptual, in adults practicing resistance training in a protocol of induction of fatigue of continuous jumps. Composed of 20 individuals, male, performed 3 interventions. In the first, performed physical assessment and familiarization. On the following occasions, cross and randomized, volunteers submitted to two conditions: whole beet juice (BET [NO3-] = 12.0 mmol) and placebo (PLA [NO3-] = 5.6 mmol). Two hours after ingestion, they performed 15 and 30 seconds of continuous jump, with a rest of 30 seconds. The data presenting mean, median, standard deviation, standard error and confidence interval, with normality tested in the Shapiro-Wilk test, not being normal was used Friedman test, with degree of freedom of Chi-square and p Wilcoxon’s test reporting only p and Cohen’s d test was used to calculate the effect size. The results showed no influence on jump height (χ²(3)= 7.8, p=0.06), strength (χ²(3)= 7.6, p=0.06) and power (χ²(3)= 7, p=0.07), showed no effect on the biochemical variables CK (χ²(3=3).= 5.2, p=0.15), also showing no effects on perception of final effort (p = 0.13 and d = 0.29) and final fatigue (p = 0.14 and d = 0.21), for mental fatigue no significant changes were found (χ²(3) = 4.4, p = 0.22). We conclude that an acute and single dose of whole beet juice did not have an effect on the performance variables such as height, strength and potency, not altering the biochemical patterns of CK and LDH or the perceptual variables PSE, fatigue and mental fatigue for individuals practicing resistance training.