Efeito agudo do exercício intervalado de alta intensidade de baixo volume sobre a pressão arterial ambulatorial de normotensos

Abstract

Introduction: Previous research have already shown the occurrence of post-exercise hypotension (PEH) after ~60 minutes of high-intensity interval exercise (HIIE) in normotensive subjects. However, there is a gap with regard to ambulatory PEH and it is not yet knowns if the low-volume HIIE reduces ambulatory blood pressure (BP) in normotensive subjects. Objective: To investigate the effect of a single session of low-volume HIIE on ambulatory BP in normotensive subjects. Methods: Twenty-one normotensive males (23.6 ± 3.6 years, 23.5 ± 2.3 kg/m2, resting PA 111.1 ± 6.4 / 62.4 ± 6.1 mmHg) performed: (i) maximum incremental test; (ii) HIIE and control sessions in a randomized order. The HIIE consisted of 10x60s at 100% of maximal velocity interspersed by 60s of passive recovery. The paired sample t-test was used to compare systolic and diastolic BP between control and HIIE sessions. A two-way ANOVA (condition vs. time) was used to compare the ambulatory BP response hour to hour following the control and HIIE sessions. Results: Systolic BP in the 20-hour analysis reduced 2.8 ± 3.7 mmHg and diastolic BP reduced 1.7 ± 3.5 mmHg after the HIIE session compared to the control session (p<0.05). In the awake period, systolic BP decreased 3.2 ± 3.7 mmHg and diastolic BP 1.8 ± 3.9 mmHg after the HIIE session compared to the control session (p<0.05). There was no difference in the systolic and diastolic BP during the asleep period (p> 0.05). The two-way ANOVA demonstrated that systolic BP was lower in the first five hours after the HIIE session compared to the control session [minimum delta: -3.2 mmHg; maximum delta: -4.8 mmHg (p <0.05)]. Conclusion: A single session of low-volume HIIE reduces ambulatory BP in normotensive. The greater magnitude of hypotension during the first five hours post-exercise seems to explain the BP reduction in 20h and awake periods.