Comparação das respostas cardiovasculares clínicas e ambulatoriais após uma sessão de caminhada com e sem restrição de fluxo sanguíneo em idosos hipertensos

Abstract

The aim of this study was to compare clinical and ambulatory cardiovascular responses after a walking session with and without blood flow restriction (BFR) in hypertensive elderly subjects. This randomized clinical trial included 10 medicated hypertensive older adults (68.3±2.0 years) who underwent preliminary procedures and two experimental sessions performed in a randomized order (With BFR and Without BFR). Pre- and post-intervention measurements (Post-1: after 30 min; Post-2: after 45 min) of blood pressure (BP) and heart rate (HR) were taken in a seated resting position. After both sessions, ambulatory BP and HR were measured over a 24-hour period. During the intervention period, in both sessions, participants performed 30 minutes of walking in an open environment at an intensity of 40-50% of HR reserve. In the session with BFR, walking was performed with cuffs positioned on both thighs and inflated to 40% of the total blood flow occlusion pressure. Compared to pre-intervention values, in both sessions, systolic BP significantly decreased at Post-1 and Post-2 (P=0.001), diastolic BP remained unchanged (P>0.05), mean BP significantly decreased at Post1 (P=0.047), HR remained significantly elevated at Post-1 (P=0.013), and the ratepressure product significantly decreased at Post-2 (P=0.016). There were no significant differences in clinical and ambulatory variables measured after the two experimental sessions (P>0.05). In conclusion, hypertensive elderly subjects showed similar clinical and ambulatory cardiovascular responses after walking sessions performed with and without BFR.