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  • Title: Obesity markers and blood pressure in a sample of Portuguese children and adolescents.
    Author: Rebelo D, Teixeira J, Marques-Vidal P, Oliveira JM.
    Journal: Eur J Cardiovasc Prev Rehabil; 2008 Feb; 15(1):73-7. PubMed ID: 18277189.
    Abstract:
    BACKGROUND: Little information exists regarding the effect of several obesity markers on blood pressure (BP) levels in youth. DESIGN: Transverse study including 2494 boys and 2589 girls. METHODS: Height, weight and waist were measured according to the international criteria and body fat (BF) by bioimpedance. BP was measured by an automated device. Hypertension was defined using sex-specific, age-specific and height-specific observation-points. RESULTS: Body mass index (BMI) and waist were positively related with systolic blood pressure (SBP) and diastolic blood pressure (DBP) and heart rate in both sexes, whereas the relationships with BF were less consistent. Stepwise linear regression analysis showed that BMI was positively related with SBP and DBP in both sexes, whereas BF was negatively related with SBP in both sexes and with heart rate in boys only; finally, waist was positively related with SBP in boys and heart rate in girls. Age and heart rate-adjusted values of SBP and DBP increased with BMI: for SBP, 117+/-1, 123+/-1 and 124+/-1 mmHg in normal, overweight and obese boys, respectively; corresponding values for girls were 111+/-1, 114+/-1 and 116+/-2 mmHg (mean+/-SE, P<0.001). Overweight and obese boys had an odds ratio for being hypertensive of 2.26 (95% confidence interval: 1.79-2.86) and 3.36 (2.32-4.87), respectively; corresponding values for girls were 1.58 (confidence interval 1.25-1.99) and 2.31 (1.53-3.50). CONCLUSION: BMI, not BF or waist, is consistently and independently related to BP levels in children; overweight and obesity considerably increase the risk of hypertension.
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