RESUMEN
Isometric handgrip or (wall) squat exercise performed three times per week produces reductions in systolic blood pressure (SBP) in adults with hypertension. We aimed to compare these interventions and the potential to retain benefits with one exercise session per week. We compared blood pressure changes following handgrip and squat isometric training interventions with controls in a randomized controlled multicentre trial in 77 unmedicated hypertensive (SBP ≥ 130 mmHg) adults. Exercise sessions were performed in the workplace and consisted of four repetitions-three sessions per week for the first 12 weeks (phase 1), and one session per week for the subsequent 12 weeks (phase 2). Office blood pressure (BP) was measured at baseline, post-phase 1 and post-phase 2. Post-phase 1, mean reductions in SBP were significantly greater in handgrip (-11.2 mmHg, n = 28) and squat (-12.9 mmHg, n = 27) groups than in controls (-.4 mmHg; n = 22) but changes in DBP were not. There were no significant within-group changes during phase 2 but SBP was 3.8 mmHg lower in the wall squat than the handgrip group-a small magnitude but clinically important difference. While both interventions produced significant SBP reductions, the wall squat appears to be more effective in maintaining benefits with a minimal training dose. The low time investment to achieve and retain clinically significant SBP reductions-42 and 12 min, respectively-and minimal cost, particularly of the wall squat, make it a promising intervention for delivery in public health settings.
Asunto(s)
Hipertensión , Adulto , Humanos , Hipertensión/tratamiento farmacológico , Presión Sanguínea , Fuerza de la Mano/fisiología , Ejercicio Físico/fisiología , Contracción Isométrica/fisiologíaRESUMEN
Introdução: O Teste de Caminhada de 6 minutos (TC6) tem sido utilizado especialmente para mensurar a capacidade funcional e avaliar a eficiência de diversos tratamentos cardiovasculares. Objetivo: O objetivo do presente estudo foi aplicar e comparar as equações preditas do TC6, em indivíduos hipertensos participantes de reabilitação cardiovascular (RCV). Material e métodos: A amostra foi composta por 39 pacientes de ambos os sexos (masculino: 11 e feminino: 28) com média de idade 57,5 ± 11 anos portadores de hipertensão arterial. Resultados: Após o programa de RCV foi verificado um aumento significativo (p < 0,001) da distância caminhada no TC6 quando comparada aos valores antes da RCV (514,7 ± 100,6 x 382,4 ± 116,3 m). Entretanto, não houve diferença estatística quando comparado os valores preditos das duas equações. Conclusão: A distância percorrida no TC6 foi maior após a RCV quando comparada aos valores iniciais, demostrando que a RCV produz benefícios na capacidade funcional dessa população. Além disso, os resultados sugerem que as duas equações avaliadas, tem aplicabilidade semelhante para a população de indivíduos hipertensos brasileiros.
Introduction: The 6-minute Walk Test (6MWT) has been used especially to measure functional capacity, to evaluate the efficiency of various cardiovascular treatments. Objective: The objective of the present study was to apply and compare the predicted EQ6 equations in hypertensive individuals participating in cardiovascular rehabilitation (CR). Methods: The sample consisted of 39 patients of both sexes (male: 11 and female: 28) with mean age 57.5 ± 11 years old with arterial hypertension. Results: After the CR program, was verified a significant increase (p < 0.001) in the 6MWT when compared to values before of CR (514.7 ± 100.6 x 382.4 ± 116.3 m). However, there was no statistical difference when compared to the predicted values of the two equations. Conclusion: The distance walked on the 6MWT was higher after the RCV when compared to the initial values, showing that the RCV produces benefits in the functional capacity of this population. In addition, the results suggest that the two equations evaluated have similar applicability for the population of Brazilian hypertensive individuals.