Efeito imediato do exercício resistido pode alterar a morfologia da onda de pulso aórtica em indivíduos pós acidente vascular cerebral crônico?

Abstract

Introduction: Stroke has a cardiovascular origin, and vascular alterations may be a risk factor for new stroke events. Resistance exercise is already recommended as therapy, with several associated positive outcomes. However, there is a lack of information about the variables related to aortic pulse wave morphology in individuals after stroke and the changes immediately after resistance exercise. Objectives: To evaluate the acute effect of single session of resistance exercise on arterial stiffness, hemodynamic and vascular variables in stroke subjects compared to healthy subjects, matched for age, sex and physical activity level. Materials and Methods: This is an experimental study, approved by the Institutional Ethics Committee (#3.555.916) and included individuals after chronic stroke. The arterial stiffness indexes: augmentation index (AIx@75, corrected for 75% of heart rate) and pulse wave velocity (PWV), hemodynamic variables: heart rate (HR), cardiac output (CO) and vascular variables: central systolic blood pressure (SBP), central diastolic blood pressure (DBP), central pulse pressure (PPc) and peripheral pulse pressure (PPp) were evaluated with brachial artery oscillometry, using the Mobil-O-Graph® equipment. The evaluations were performed before (rest period) and immediately after the resistance exercise protocol. To define the load of the resistance protocol, a test of 1 repetition maximum (RM) was performed on the extensor bench and the weight used was 75% of 1RM, with 10 repetitions. Results: Twenty-three chronic after stroke individuals with a mean of 35.4 (26.3) months of illness and 23 healthy individuals were included. The two groups had a mean age of 53 (18) years. The comparison of variables between pre and post exercise between the groups did not differ significantly in the after stroke and healthy groups, respectively. On arterial stiffness indices: mean difference between groups post and pre exercise (standard deviation): AIx@75(%): 2.31(8.12) and 5.04(7.98); VOP(m/s): 0.11(0.29) and 0.31(1.33); HR(bpm): 1.92(9.14) and 4.71(6.47); CO(l/min): 0.05(0.42) and -0.02(0.50); SBP(mmHg): 2.66(7.93) and - 0.39(7.03); DBP(mmHg): -0.31(6.35) and 10.71(43.59); PPc(mmHg): 2.98(5.59) and 10.71(43.59); PPp(mmHg): 2.45(7.28) and 2.75(6.02). Conclusions: Arterial stiffness, hemodynamic and cardiovascular variables were not changed immediately after the resistance training protocol in subjects after chronic stroke and in healthy subjects. The values remained the same as in the baseline state.