Bioimpedância elétrica e gordura visceral: uma comparação com a tomografia computadorizada em adultos e idosos

Abstract

RESUMOObjetivo: Avaliar a associação entre bioimpedância elétrica (BIA) e gordura visceral (GV) em adultos e idosos. Sujeitos e métodos: Estudo transversal, 191 indivíduos (52% mulheres, 49% idosos), estratificados por sexo, grupo etário e massa corporal. Obtiveram-se dados sobre tomografia computadorizada (área de GV) e BIA (percentual de gordura corporal total (%GCT-BIA), ângulo de fase, reactância e resistência). Análise estatística: Coeficiente de Correlação de Pearson, Anova, Qui-quadrado de Pearson, Curva ROC. Resultados: Áreas de GV ≥ 130 cm 2 foram mais observadas em idosos e em homens. Entre as mulheres adultas, mostrou-se correlação mais forte entre GV e %GCT-BIA. Os demais grupos apresentaram resultados semelhantes e correlações estatisticamente significantes. As correlações entre GV e ângulo de fase foram fracas e sem significância estatística. As análises da Curva ROC indicaram os seguintes %GCT-BIA que identificaram excesso de GV: homens: 21,5% (adultos), 24,25% (idosos); mulheres: 35,05% (adultas), 38,45% (idosas), com sensibilidade de 78,6%, 82,1%, 83,3%, 66,7% e especificidade de 70,6%, 62,5%, 79,1%, 69%, respectivamente. Conclusão: BIA apresentou satisfatória sensibilidade e especificidade para predizer GV, entretanto, outros aparelhos e técnicas devem ser investigados para melhorar essa predição.Arq Bras Endocrinol Metab. 2013;57(1):27-32 Descritores Gordura visceral; impedância elétrica; tomografia computadorizada ABSTRACT Objective: To evaluate the association between electrical bioimpedance analysis (BIA) and visceral fat (VF) in adult and elderly patients. Subjects and methods: This was a cross-sectional study, with a sample of 191 subjects (52% women, 49% elderly) stratified by sex, age and body mass. Computerized tomography (VF area) and BIA (percentage of total body fat (%TBF-BIA), phase angle, reactance and resistance) data were generated. Statistical analysis was based on Pearson's Correlation Coefficient, Anova, Pearson's Chi-square, and ROC curves. Results: VF areas ≥ 130 cm 2 were more prevalent among the elderly and among men. Adult females showed a stronger correlation between GV and %TBF-BIA. The other groups showed similar results and statistically significant correlations. Correlations between GV and phase angle were weak and not statistically significant. ROC Curves analyzes showed the following %TBF-BIA, which identified excess VF: for male subjects: 21.5% (adults) and 24.25% (elderly); for female subjects: 35.05% (adults) and 38.45% (elderly) with sensitivity of 78.6%, 82.1%, 83.3%, and 66.7%, and specificity of 70.6%, 62.5%, 79.1%, and 69%, respectively. Conclusion: BIA was found to have satisfactory sensitivity and specificity to predict VF; however, other devices and other techniques should be investigated to improve VF prediction.

Prevalence, temporal trend and associated factors with excess body weight in mothers of children under five years

“…In the present study, BIA was used, which is a doubly indirect method that has been used in both scientific research and clinical practice [38] because it shows very similar results to those obtained with more sophisticated resources. An investigation that compared the validity of BIA, having the results obtained by computed tomography as a gold standard, found a sensitivity of 83.3% and a specificity of 79.1%, concluding that BIA has a satisfactory validity [39].…”

Can neck circumference predict insulin resistance in older people? A cross-sectional study at primary care in Brazil

“…The bioimpedance analysis is a validated method with satisfactory sensitivity and specificity to predict VF in older population 23 . Li et al 24 , comparing neck and lower abdomen CT areas, found significant correlation between NC and VF in Chinese adult men and women, what may be accounted by the fact that neck fat was significantly correlated with VF.…”

Glomerular filtration rate and its relationship with visceral and subcutaneous adiposity: a study with patients from Northeast Brazil

“…All fat areas were expressed in cm². To identify the adipose tissue, density values of -50 and -250 Hounsfield units were used 15,16 .…”

“…A visceral fat volume greater than 130 cm 2 represented visceral obesity diagnosis 16,17 . However, due to a lack of individuals within the normal range, these values were divided into tertiles.…”