Resposta cardiovascular após uma única sessão de exercícios resistidos com restrição de fluxo em idosos hipertensos.

Abstract

The aim of this study was to compare the acute effects of resistance exercise performed with and without blood flow restriction on blood pressure (BP) and heart rate (HR) in hypertensive elderly subjects. The sample was consisted by 10 elderly (68±8 years) hypertensive medicated subjects. The volunteers were submitted to preliminary procedures (anamnesis; BP measurement at rest; anthropometric evaluation; familiarization with resistance exercise; evaluation of maximum strength; evaluation of flow restriction pressure), and experimental procedures (2 sessions with the execution of resistance exercise performed in random order: blood flow restriction (BFR); no blood flow restriction (NBFR). Before and after the intervention (30 and 60 minutes), BP and HR measurements were taken. After the two experimental sessions, ambulatory BP and HR measurements were performed (for 24 hours). During the intervention period, the volunteers performed four unilateral resistance exercise, 3 set until moderate fatigue, with a 90-second rest interval between each set. In the experimental NBFR session, the exercises were performed with an intensity of 50% of 1 RM. In the BFR experimental session, the exercises were performed with an intensity of 20-30% of 1 RM, and with cuffs inflated to 70% of the total occlusion pressure. In comparison with the pre-intervention values, there was an increase in systolic (BFR: 129.3 ± 12.3 vs. NBFR: 117.5 ± 11.8 mmHg, P<0.05), (BFR: 81.4 ± 7.4 vs. NBFR: 75.7 ± 6.9 mmHg, P <0.05) and mean (BFR: 97.4 ± 6.9 vs. NBFR: 89.6 ± 7.4 mmHg, P <0.05) BP in both experimental sessions, with a greater increase in BFR There was a reduction in HR up to 60 minutes post-exercise in a similar way between sessions (BFR: 68.2 ± 9.2 vs. NBFR: 69.6 ± 7.9 bpm, P <0.05). The ambulatory values did not show significant differences between the experimental sessions. In conclusion, both experimental sessions (BFR and NBFR) increased the post-exercise BP in clinical conditions, and the BFR session promoted a greater increase. in HR, there was a reduction in post-exercise values in both sessions and not there were significant differences in the Rate pressure product. These differences between sessions were not maintained in outpatient conditions.