RESPOSTA PRESSÓRICA SISTÓLICA EM PLATÔ NO CICLOERGÔMETRO EM INDIVÍDUOS SAUDÁVEIS: ESTUDO DE REPRODUTIBILIDADE

Abstract

High blood pressure (AH) is one of the predisposing factors for cardiovascular diseases (CVD), which are the main cause of death, hospitalization and outpatient care worldwide. The prevalence of this condition in Brazil, from 18 years of age, is 26,3%. The measurement of blood pressure (BP), during exercise is a topic of constant discussion, due to the low reproducibility observed in sevral studies. The objective of this study was to evaluate the viability and reproducibility of blood pressure plateau in a submaximal exercise test performed on a cycle ergometer in healthy young individuals of both sexes. This is an experiemnatl study conducted at the Laboratory of Respiratoty Physiology (LAFIR) of the Federal University of South Mato Grosso (UFMS). Thirty individuals, equally distributed between sexes, aged 18 to 30 years, were included. The evaluation was performed on an eletromagnetic brake cycle ergometer (model VSprint 200) using a submaximal protocol (70% of the predicted HR), followed by a load variation phase (+/- 25 Watt). Two tests were performed under the same conditions, with an interval of up to one week. One-way repeated measures analysis of variance (ANOVA) was used for statistical comparisons between the sequencial BP values of the groups, while reproducibility was assessed by repeatability coefficient (CR); mean standard error (EP) and interclass correlation coefficient (ICC). The systolic blood pressure plateau (1-2-3 min) was established, and the CR,EP and ICC values were respectively 32,1; 3 and 0,91 for man and 27,2; 2,6 and 0,75 for women, respectively. In comparison, the values obtained for evaluation of submaximal SBP were 18; 1,67 and 0,96 in men and 31,3; 2,9 and 0,67 in women.This study proposed a new protocol that generates a steady state of SBP during physical exercise, which, althoug it demostrated excellent reproducibility, presented values slightly lower than submaximal SBP. However, when performing the subgroup analysis, it was observed that the plateau performed better than submaximal SBP in women. Therefore, it is necessary to expand the age range and clinical diversity of individuals studied to verify the clinical potencial of this protocol in blood pressure assessment, especially for women, who represent a more challenging group in blood pressure assessment during exercise. Descriptors: high blood pressure; stress test; physical exercise