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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Metabolic cardiovascular syndrome in obese prepubertal children: the role of high fasting insulin levels.
Metabolism: Clinical and Experimental 2002 April
The aim of this study was to detect the presence and degree of impairment of cardiovascular disease (CVD) risk factors, grouped as metabolic cardiovascular syndrome (MCS), in obese prepubertal children. We also assessed the influence of high fasting insulin levels in this pathological status. A cross-sectional study was performed on obese children based on fasting blood samples. Subjects were 61 obese children (aged 6 to 9 years) and an equal number of non-obese children paired by age and sex. The obese children presented the following characteristics in comparison to the non-obese group: significantly high levels of insulin (8.2 +/- 0.52 v 6.12 +/- 0.34 microU/mL), triglycerides (TG) (0.79 +/- 0.04 v 0.60 +/- 0.02 mmol/L), uric acid (0.24 +/- 0.005 v 0.21 +/- 0.004 mmol/L), systolic (SBP) (94.59 +/- 1.06 v 88.85 +/- 1.2 mm Hg) and diastolic (56.49 +/- 1.07 v 52.21 +/- 1.06 mm Hg) blood pressure (DBP), and low levels of high-density lipoprotein cholesterol (HDL-C) (1.30 +/- 0.04 v 1.46 +/- 0.03 mmol/L), and nonesterified fatty acids (0.407 +/- 0.02 v 0.505 +/- 0.02 mmol/L). The hyperinsulinemic obese children showed the same types of differences when compared with the normoinsulinemic group. In the obese group, having adjusted for age, waist/hip ratio (WHR), body mass index (BMI), and sex hormone-binding globulin (SHBG), insulin was an independent prediction factor for triglycerides (P =.0004), apolipoprotein A-I (Apo-AI) (P =.005), and alanine aminotransferase (ALT) (P =.029). BMI was an independent prediction factor for HDL-C (P =.001) and triglycerides (P =.027). However, insulin was an independent prediction factor in the control group for triglycerides (P =.0002) and SBP (P =.012), just as BMI was for HDL-C (P =.011) and uric acid (P =.041). We conclude that the cluster of CVD risk factors associated with MCS and intra-abdominal fat is present in obese prepubertal children. This situation seems to depend, to a large extent, on the insulin basal level. The apparent association between BMI and MCS is due to the correlation between BMI and insulin, and to the fact that insulin associates with MCS. Within the obese group, hyperinsulinemic children present the greatest impairment in the parameters considered to be constituents of MCS.
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