Disfunçâo vasodilatadora durante o exercício físico em indivíduos saudáveis com histórico familiar de doença renal crônica

Abstract

INTRODUCTION: Individuals with positive family history of chronic kidney disease (CKD+FH) present hemodynamic changes that directly influence the emergence and development of this disease. However it is unclear whether there is impairment of vasodilatation in CKD+FH individuals during the exercise. OBJECTIVES: To test the hypothesis that healthy subjects with CKD+FH have diminished muscle vasodilatation during exercise. METHODS: We study nine healthy subjects with CKD+FH and 17 healthy individuals without family history of chronic disease (CKD-FH) matched for age (27±2 vs. 26±1 years, p=0,67, respective). Blood pressure (oscilometric - DIXTAL® 2023) heart rate (DIXTAL® 2023) and forearm blood flow (venous occlusion pletysmography - Hokanson®) were measured for 3 minutesbaseline followed by 3 minutes isometric handgrip exercise 30% of maximum voluntary contration. Vasodilatation muscle was calculated by dividing the forearm blood flow by the blood pressure mean multiplied by 100. Serum creatinina was measure to estimate glomerular filtration rate. Was applied ANOVA two-way followed by post hoc Tukey, adopting p<0,05. The results are expressed as mean ± SE. RESULTS: Serum creatinina (p=0,74), the estimate glomerular filtration rate (p=0,90), systolic blood pressure (p=0,11), diastolic blood pressure (p=0,82), mean blood pressure (p=0,44) and heart rate (p=0,86) were similar between groups. And all the volunteers showed no proteinuria and hematuria. At baselina forearm blood flow was similar between the groups CKD+FH and CKD-FH (2,51±0,37 vs. 2,85±0,18 mL/min/100mL, p=0,06), but increased significantly during exercise only in CKD-FH group (p=0,03). At baseline, muscle vasodilatation was similar between groups (2,85±0,37 vs. 3,41±0,21 units, respectively, p=0,78). During exercise the CKD+FH group showed no significant changes during the first, second and third minute of exercise in relation to baseline (3,19±0,54, 2,91±0,30 e 2,45±0,24 units, respectively). However we observed a significant increased in muscle vasodilatation in relation to physical exercise in CKF-FH group (4,06±0,36, 4,30±0,34 e 4,55±0,48 units, respectively). CONCLUSION: In healthy subjects with positive family history of chronic kidney disease have vasodilator dysfunction during exercise.