Efeito agudo da ingestão do suco de beterraba exercício de força combinado a restrição de fluxo sanguíneo nas medidas hemodinâmicas de mulheres hipertensas

Abstract

The non-pharmacological treatment of Systemic Artery Hypertension (SAH) consists of strategies that aim to change the lifestyle and that can lead to a reduction in the dosage of drugs or even their dispensation. A strategy that has been used to reduce SAH is the use of different foods. One of these foods is beetroot juice (BJ) which seems to have a positive effect on the endothelial system because it increases blood plasma and increases nitric oxide production, in addition to BJ, strength exercise (SE) combined with blood flow restriction. (BFR) has also been used to reduce blood pressure. And, when reviewing the relevant literature, it was observed that there are gaps in knowledge about the effect of the combination of BJ and blood flow restriction on hemodynamic measurements. Thus, the aim of the present study was to analyze the acute effect of the ingestion of beetroot juice and strength exercise combined with BFR on the hemodynamic measurements of hypertensive women. An experimental research was developed in the crossover and randomized model. Twelve hypertensive women participated, aged between 29 and 61 years. They were randomly divided between six protocols (crossover): 1) BJ only; 2) BJ combined with low load SE with 30% of 1 repetition maximum [1RM] (BJ+LL); 3) BJ combined at low load with 30% of 1RM and BFR (BJ+LL+BFR); 4) BJ combined with high load SE with 75% of 1RM (BJ+HL); 5) Low load SE with 30% of 1RM (LL); 6) high load with 75% of combined 1RM (HL). The evaluation of hemodynamic measurements [systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR) and double product (DP)] were performed/calculated before, immediately after, 15, 30, 45 and 60 minutes after each protocol. Data were analyzed using the computerized statistical package Statistical Package for the Social Science (SPSS) version 20.0. The two-way ANOVA of repeated measures was used followed by the post hoc Bonferroni test and the significance level adopted will be p<0.05. The SB+BC+RFS and SB+AC protocols safely increased hemodynamic measurements and promoted a hypotensive effect on SBP, DBP and MAP (p<0.05); 2) SB+BC safely increased hemodynamic measurements and promoted a hypotensive effect on DBP and MAP (p<0.05); 3) Exercise protocols safely increased hemodynamic parameters (SBP, DBP, PAM, HR and DP), with some protocols (SB+BC+RFS, SB+AC, BC and AC) achieving a reduction in cardiac work. It was concluded that post-exercise hypotensive responses occurred in three protocols (BJ+LL+BFR, BJ+LL and BJ+HL) and the all exercise protocols safely increased hemodynamic parameters, with a reduction in cardiac work in some.