[Show abstract][Hide abstract] ABSTRACT: To verify the correlation between body fat location measurements with the body mass index (BMI), body fat percentage (BF%) and height, according to the nutritional status in female adolescents.
[Show abstract][Hide abstract] ABSTRACT: Excessive body fat, mainly abdominal fat, is associated with higher cardiovascular risk. However, a fat localisation measurement that would be more indicative of risk in adolescents has not yet been established.
This study was conducted in order to evaluate the correlation between body fat location measurements and cardiovascular disease risk factors in female adolescents.
A total of 113 girls - 38 eutrophic according to their body mass index but with a high percentage of body fat, 40 eutrophic with adequate body fat, and 35 with excessive weight - were evaluated using 15 anthropometrical measurements and 10 cardiovascular risk factors.
The central skinfold was the best measurement for predicting variables such as glycaemia and high-density lipoprotein; waist circumference for insulin and homeostasis model assessment; coronal diameter for total cholesterol and low-density lipoprotein; sagittal abdominal diameter for triglycerides and leptin; hip circumference for blood pressure; and the central/peripheral skinfold ratio for homocysteine. The correlation between the measurements and the number of risk factors showed that waist circumference and the waist/stature ratio produced the best results.
The results suggest that the body fat distribution in adolescents is relevant in the development of cardiovascular risk factors. Simple measurements such as waist circumference and the waist/stature ratio were the best predictors of a risk of disease and they should therefore be associated with the body mass index in clinical practice in order to identify those adolescents at higher risk.
No preview · Article · Sep 2011 · Cardiology in the Young
[Show abstract][Hide abstract] ABSTRACT: OBJETIVO: Avaliar se a medida da circunferência da cintura e a relação cintura/estatura (RCE) são preditoras de fatores de risco cardiovasculares em adolescentes do sexo feminino. MÉTODOS: Avaliaram-se 113 adolescentes de 14 a 19 anos quanto à antropometria (peso, estatura e circunferência da cintura), parâmetros bioquímicos e clínicos (colesterol total, LDL-C, HDL-C, triglicerídeos, glicemia de jejum, insulina, homeostasis model assessment to assess insulin resistance - HOMA-IR, leptina, homocisteína e pressão arterial). Considerou-se como ponto de corte de obesidade abdominal valores de cintura e RCE>percentil 90. RESULTADOS: As adolescentes com obesidade abdominal apresentaram valores significantemente maiores de triglicerídeos (exceto para a RCE), insulina, HOMA-IR, leptina, pressão arterial sistólica e diastólica; o HDL-C foi mais baixo no grupo com cintura >percentil 90, porém sem significância estatística (p=0,052). CONCLUSÕES: O presente estudo demonstrou que a cintura e a RCE são medidas úteis para identificar adolescentes do sexo feminino com maior risco cardiovascular; contudo, a circunferência da cintura, isoladamente, apresentou melhor desempenho.
Full-text · Article · Sep 2011 · Revista Paulista de Pediatria
[Show abstract][Hide abstract] ABSTRACT: Objective: To evaluate if the waist circumference and the waist-to-height ratio (WHTR) are predictors of cardiovascular risk factors in female adolescents. Methods: 113 adolescents aged 14 to 19 years old were assessed according to anthropometric data (weight, height, waist circumference), biochemical and clinical parameters (total cholesterol, LDL-C, HDL-C, triglyceride, fasting glucose, insulin, homeostasis model to assess insulin resistance - HOMA-IR), leptin, homocysteine and blood pressure. The cut points used for identification of abdominal fat were waist and WHTR values ≥90th percentile. Results: Teenagers with abdominal obesity presented greater values of triglycerides (except for WHTR), insulin, HOMA-IR, leptin and systolic and diastolic blood pressure, while the HDL-C was reduced in the group with waist circumference ≥90th percentile, however without statistical significance (p=0.052). Conclusions: The present study showed that waist and WHTR are useful measures to identify female adolescents with a high cardiovascular risk, however the waist circumference presented a better performance.
No preview · Article · Sep 2011 · Revista Paulista de Pediatria
[Show abstract][Hide abstract] ABSTRACT: adolescents with excess body fat and eutrophic had the same metabolic changes expected in obese individuals.
to evaluate body composition, anthropometric changes, biochemical and clinical characteristics of female adolescents.
a total of 113 adolescents from public schools in Viçosa, MG, divided into three groups: group 1 - consisting of eutrophic adolescents with excess body fat; group 2 - eutrophic with body fat within normal limits; and group 3 - with excess weight and body fat. Weight, height, waist and hip circumference, blood pressure were measured. The body mass index (BMI) and waist-hip ratio were calculated. The percentage of body fat was obtained by bioelectrical impedance horizontally, following its own protocol for this evaluation. The assessment of the percentage of body fat and biochemistry was performed after 12 hours of fasting, and analyzed the lipid profile, blood glucose and insulin, homocysteine, leptin and C-reactive protein. Insulin resistance was calculated by HOMA index.
the group of eutrophic adolescents, with higher adiposity, behaved in relation to blood pressure, HDL and glucose levels, similarly to adolescents who are overweight. It can be seen that the HOMA index, insulin and leptin increased with increasing body fat. More than half of adolescents had total cholesterol and CRP levels above recommended levels. The most obvious metabolic disorder related to the lipid profile for both groups studied.
excess adiposity in normal weight adolescents may be related to clinical and biochemical changes similar to those found in adolescents who are overweight.
Full-text · Article · Oct 2010 · Arquivos brasileiros de cardiologia
[Show abstract][Hide abstract] ABSTRACT: Assess diagnostic validity of four reference tables for waist circumference in female teenagers in order to detect lipid alterations, hyperinsulin, elevated homeostasis model assessment (HOMA), hyperleptinemia and excess of body adiposity.
A total of 133 female subjects, ranging from 14 to 19 years of age , were evaluated. All adolescents were recruited from public schools in Viçosa/MG. Blood samples were collected for determination of fasting plasma cholesterol total, LDL, HDL, triglycerides, insulin and leptin. Percentage of body fat was determined through tetrapolar electrical bioimpedance. Using the smallest abdominal measure it was possible to determine waist circumference and calculated values of sensibility, specificity, positive and negative predictive values. Waist circumference contingency tables were obtained using four criteria: Freedman et al., 1999; Taylor et al., 2000; McCarthy et al., 2001; and Moreno et al., 2007.
In general, sensibility values were low for circumferences assessed and the highest values were obtained for the table of McCarthy et al., on the other hand, specificity values were high considering the table of Freedman et al. The positive predictive values were more relevant for total cholesterol and body fat percentage.
Cutoffs for waist circumference used by McCarthy et al. were the most appropriate for populational assessments. Freedman's et al. proposal is appropriate for clinical use since it presents higher specificity. In addition, it can substitute high costs exams, out of the professionals' reach such as insulin and leptin.
Full-text · Article · Jan 2010 · Revista da Associação Médica Brasileira