IJCS | Volume 32, Nº1, January/ February 2019

DOI: 10.5935/2359-4802.20180084 48 ORIGINAL ARTICLE International Journal of Cardiovascular Sciences. 2019;32(1)48-54 Mailing Address: Thiago Rozales Ramis Rua Felizardo, 750. Postal Code: 90450-190, Jardim Botânico, Porto Alegre - RS, Brazil. E-mail: thiago.ramis@yahoo.com.br Hypotensive Response to Continuous Aerobic and High-Intensity Interval Exercise Matched by Volume in Sedentary Subjects Francesco Pinto Boeno, 1,2 Thiago Rozales Ramis, 2 J uliano Boufleur Farinha, 2 Cesar Moritz, 2 Vagner Pereira dos Santos, 1 Alvaro Reischak de Oliveira, 2 Bruno Costa Teixeira 1 Universidade Regional Integrada do Alto Uruguai e das Missões (URI), 1 São Luiz Gonzaga, RS - Brazil Universidade Federal do Rio Grande do Sul (UFRS), 2 Porto Alegre, RS - Brazil Manuscript received on January 19, 2018, revised manuscript on June 29, 2018, accepted on July 23, 2018. Abstract Background: Systemic arterial hypertension (SAH) is one of the main risk factors for heart disease. Among the benefits linked to different modalities of physical exercise, post-exercise hypotension (PEH) is a key point for exercise prescription in this condition. Objective: To investigate and compare PEH in response to continuous aerobic exercise (CONT) and high-intensity interval exercise (HIIE), matched by volume, in sedentary individuals. Methods: A randomized cross-over study, composed of sedentary, healthy male subjects submitted to two acute physical exercise protocols matched by volume, HIIE and CONT, on a treadmill. Hemodynamic measures for the evaluation of PEH were performed pre, immediately after exercise and every five minutes thereafter, during one hour of recovery. Two-way ANOVA with repeated measurements was used for comparisons between groups and Bonferroni post hoc test as appropriate. P < 0.05 was considered significant. Results: Both exercise protocols promoted significant PEH, with reductions in systolic blood pressure (SBP) and mean arterial pressure (MAP). HIIE promoted a reduction of SBP and MAP at the 15 th minute, whereas the same effect was observed at the 30 th following CONT. Conclusion: Both HIIE and CONT, matched by volume, promote PEH of similar magnitude. However, PEH occurs earlier following HIIE, suggesting a better time / effectiveness ratio, and an additional beneficial effect of this modality. (Int J Cardiovasc Sci. 2019;32(1)48-54) Keywords: Hypertensio/physiopathology; Cardiomegaly; Sedentarsm; Adherence Guidelines; Blood Pressure; Post –Exercise hypotension; Exercise; High-Intensity Interval Exercise. Introduction Systemic arterial hypertension (SAH) is amultifactorial chronic disease associated with metabolic and hormone dysfunctions, myocardial hypertrophy and lifestyle. 1 There is an exponential increase in the risk of cardiovascular events when systolic blood pressure (SBP) and diastolic blood pressure (DBP) are above 115 and 75 mmHg, respectively. Increments of 20 mmHg in SBP or 10 mmHg in DBP increase the risk for cardiovascular events by 100%. 2 Nonpharmacological, low-cost strategies for prevention and treatment of SAH include regular physical exercise and interventions supported by national and international guidelines as primary strategy for the treatment of SAH. 3,4 Physical exercise cause physiological changes including post-exercise hypotension (PEH), which can effectively attenuate myocardial overload in SAH. 5 Studies have demonstrated the occurrence of PEH in response to continuous aerobic exercise (CONT), 5 resistance exercise, 6 and more recently, to high-intensity