Impaired hemodynamic response to mental stress in subjects with prehypertension is improved after a single bout of maximal dynamic exercise
Medeiros, Renata Frauches; Silva, Bruno Moreira; Neves, Fabricia Junqueira; Rocha, Natalia Galito; Sales, Allan Robson Kluser; Nobrega, Antonio Claudio.
Clinics
; 66(9): 1523-1529, 2011. ilus, tab
Artigo
em Inglês
| LILACS | ID: lil-604287
INTRODUCTION:
High blood pressure during mental stress in subjects with prehypertension is associated with blunted vasodilation in skeletal muscles, which might be improved by an acute bout of exercise.OBJECTIVE:
To investigate the hemodynamic responses to mental stress before and after a bout of exercise in subjects with prehypertension.METHOD:
Eighteen subjects with prehypertension and 16 with normotension underwent a mental stress test before and after a maximal cardiopulmonary exercise test on a treadmill. Blood pressure was measured by auscultation, and forearm blood flow was measured by venous occlusion plethysmography; from these measurements, the vascular conductance was calculated.RESULTS:
Subjects with prehypertension had a higher mean blood pressure during mental stress (prehypertension 112±2 vs. normotension 101±3 mm Hg, p<0.05), and their vascular conductance did not increase (baseline 0.025±0.004 vs. mental stress 0.022±0.003 a.u., p.0.05). After the exercise bout, the mean blood pressure during mental stress was lower in subjects with prehypertension (before exercise 112±2 vs. after exercise 107±2 mm Hg, p<0.05), and vascular conductance increased (baseline 0.011±0.001 vs. mental stress 0.024±0.004 a.u., p<0.05).CONCLUSION:
Subjects with prehypertension had elevated blood pressure and a blunted vasodilator response during mental stress, but their blood pressure was attenuated and their vasodilator response was normalized after a single bout of maximal dynamic exercise.
Biblioteca responsável:
BR1.1
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