Capacidade preditiva de equações de gordura corporal em relação aos marcadores bioquímicos e clínico de risco cardiovascular, em adolescentes de Viçosa-MG

• Autor(a) principal: Faria, Franciane Rocha de
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2751
• topic: Adolescente; Gordura corporal; Fatores de risco cardiovascular; Teenagers; Corporal body; Cardiovascular risk factors; CNPQ::CIENCIAS DA SAUDE::NUTRICAO

The identification of precise and suitable methods for predicting body fat is necessary on nutritional status evaluation, also in adolescence, avoiding hazardous health effects persist until adulthood. The identification of body fat equations, which results associate with cardiovascular risk factors in adolescents become relevant, once individuals with body fat fraction, broadly, present metabolic syndrome components. This work objective was to verify body fat equations capability in predicting changes in biochemical and clinic parameters of cardiovascular risk, in adolescents, of both sex, and 15 to 18 years old. The adolescents were selected by simple random sampling, considering the inclusion criteria: menarche presence by at least on year (feminine) and armpit hair (masculine); do not having participated of nutritional studies/consults in the last 6 months; to show Body Mass Index (BMI)/age &#8804; 25th percentile and BMI/age &#8805; 75th percentile or BMI/age &#8805; 85th percentile. According to the nutritional status classification it was grouped in : group 1 (G1) (n=140): eutrophics and group 2 (G2) (n=70): with overweight. It was It was verified weight, high, brachial perimeter and skinfolds. The body fat content was estimated by 10 anthropometric equations and by tetra polar horizontal and vertical electric bioimpedances with eight tactic electrodes, being the body fat content (%BF) classified according to Lohman. It was performed total cholesterol (TC) serum dosage, low density lipoprotein (LDL), high density lipoprotein (HDL), triglycerides (TG), uric acid, insulin, fasting glucose, calculated the Homeostasis Model Assessment Insuling Resistence (HOMA-IR), verified the arterial pressure and evaluated the physical activity level. The study was approved by the Federal University of Viçosa Research Human Ethics Committee. Participated 210 adolescents, with mean 16.8 +- 1.0 year old being 52,4% (n=110) from feminine sex. The excess of body fat ranged between 34.3 (n=72) to 87.6% (n=184), according to the equation or electric bioimpedance equipment used. The feminine adolescents presented higher values of %BF, TC, HDL, LDL, insulin, HOMA-IR diastolic arterial pressure (DAP) (p < 0.05). On the analysis of the ROC curves, for prediction of changes in the biochemical and clinical parameters of cardiovascular risk, it was found that the majority of the body fat estimatives detected alteration on the serum concentration of TG, HDL, insulin and ROMA-IR (p<0.01). It was found high sensibility, low specificity, high negative predictive value and low positive predictive value for all methods of body fat estimative in relation to biochemical and clinical parameters in G2. On the multiple regression analysis on G1 it was verified that the %BF estimated by equation 5 got associated with TG, DAP and insulin. On G2 all the %BF maintained the association with TG, insulin and HOMA-IR, metabolic syndrome components. In basis with the results obtained in the study and considering that all anthropometric equations are differentiated by sex, it can be inferred that the better body composition equation was the one developed by Wetstrate and Deurenberg (1989) (equation 9), since, on the multiple regression, got associated with greater number of risk factors, independently of adolescents nutritional status.