[Abdominal obesity in ELSA-Brasil (Brazil's Longitudinal Study of Adult Health): construction of a latent gold standard and evaluation of the accuracy of diagnostic indicators]. / Obesidade abdominal no ELSA-Brasil: construção de padrão-ouro latente e avaliação da acurácia de indicadores diagnósticos.

This study evaluated the accuracy of abdominal obesity (AO) indicators, defining a latent variable as the gold standard. The study included 12,232 participants of the ELSA-Brasil (Brazil's Longitudinal Study of Adult Health), between 35 and 74 years of age. Three AO indicators were evaluated: waist circumference (WC), waist hip ratio (WHR) and conicity index (C index). Analyses were stratified by sex and race/skin color. All groups had a high prevalence of AO, being greater among white men (~70%) and black women (~60%). A high incidence of WC was observed for men, WHR and C index between men and women for discriminating latent AO. The following cutoff points for AO indicators were identified among white, brown and black men, respectively: WC: 89.9cm; 90.2cm and 91.7cm; WHR: 0.92; 0.92 and 0.90; C index: 1.24; 1.24 and 1.24. The cutoff points identified among white, brown and black women were, respectively: WC: 80.4cm, 82.7cm and 85.4cm; WHR: 0.82; 0.83 and 0.84; C index: 1.20; 1.22 and 1.19 The WC among men and the WHR and C index among men and women presented high power to discriminate latent AO, the C index being the best indicator.

Este estudo avaliou a acurácia de indicadores de obesidade abdominal (OA), definindo uma variável latente como padrão-ouro. Foram estudados 12.232 participantes do ELSA-Brasil de 35 a 74 anos. Avaliou-se três indicadores de OA, estratificados por sexo e raça/cor: circunferência da cintura (CC), razão cintura quadril (RCQ) e índice de conicidade (Índice C). Todos os grupos mostraram elevadas prevalências de OA, maiores entre os homens brancos (~70%) e mulheres pretas (~60%). Observou-se alta acurácia da CC para homens, RCQ e índice C entre homens e mulheres para discriminar OA latente. Identificou-se os seguintes pontos de corte para os indicadores de OA entre os homens brancos, pardos e pretos, respectivamente: CC: 89,9; 90,2 e 91,7cm; RCQ: 0,92; 0,92 e 0,90; índice C: 1,24; 1,24 e 1,24. Para as mulheres brancas, pardas e pretas, respectivamente, os pontos de corte identificados foram: CC: 80,4; 82,7 e 85,4cm; RCQ: 0,82; 0,83 e 0,84; índice C: 1,20; 1,22 e 1,19. A CC entre os homens e a RCQ e índice C entre homens e mulheres apresentaram alto poder para discriminar OA latente, sendo o índice C o melhor indicador.

Obesidade abdominal no ELSA-Brasil: construção de padrão-ouro latente e avaliação da acurácia de indicadores diagnósticos / Abdominal obesity in ELSA-Brasil (Brazils Longitudinal Study of Adult Health): construction of a latent gold standard and evaluation of the accuracy of diagnostic indicators

Resumo Este estudo avaliou a acurácia de indicadores de obesidade abdominal (OA), definindo uma variável latente como padrão-ouro. Foram estudados 12.232 participantes do ELSA-Brasil de 35 a 74 anos. Avaliou-se três indicadores de OA, estratificados por sexo e raça/cor: circunferência da cintura (CC), razão cintura quadril (RCQ) e índice de conicidade (Índice C). Todos os grupos mostraram elevadas prevalências de OA, maiores entre os homens brancos (~70%) e mulheres pretas (~60%). Observou-se alta acurácia da CC para homens, RCQ e índice C entre homens e mulheres para discriminar OA latente. Identificou-se os seguintes pontos de corte para os indicadores de OA entre os homens brancos, pardos e pretos, respectivamente: CC: 89,9; 90,2 e 91,7cm; RCQ: 0,92; 0,92 e 0,90; índice C: 1,24; 1,24 e 1,24. Para as mulheres brancas, pardas e pretas, respectivamente, os pontos de corte identificados foram: CC: 80,4; 82,7 e 85,4cm; RCQ: 0,82; 0,83 e 0,84; índice C: 1,20; 1,22 e 1,19. A CC entre os homens e a RCQ e índice C entre homens e mulheres apresentaram alto poder para discriminar OA latente, sendo o índice C o melhor indicador.

Abstract This study evaluated the accuracy of abdominal obesity (AO) indicators, defining a latent variable as the gold standard. The study included 12,232 participants of the ELSA-Brasil (Brazil's Longitudinal Study of Adult Health), between 35 and 74 years of age. Three AO indicators were evaluated: waist circumference (WC), waist hip ratio (WHR) and conicity index (C index). Analyses were stratified by sex and race/skin color. All groups had a high prevalence of AO, being greater among white men (~70%) and black women (~60%). A high incidence of WC was observed for men, WHR and C index between men and women for discriminating latent AO. The following cutoff points for AO indicators were identified among white, brown and black men, respectively: WC: 89.9cm; 90.2cm and 91.7cm; WHR: 0.92; 0.92 and 0.90; C index: 1.24; 1.24 and 1.24. The cutoff points identified among white, brown and black women were, respectively: WC: 80.4cm, 82.7cm and 85.4cm; WHR: 0.82; 0.83 and 0.84; C index: 1.20; 1.22 and 1.19 The WC among men and the WHR and C index among men and women presented high power to discriminate latent AO, the C index being the best indicator.

Indicators of Abdominal Adiposity and Carotid Intima-Media Thickness: Results from the Longitudinal Study of Adult Health (ELSA-Brazil).

BACKGROUND: Abdominal adiposity is a risk factor for cardiovascular disease. OBJECTIVE: To determine the magnitude of the association between abdominal adiposity, according to five different indicators, and the carotid intima-media thickness (CIMT). METHODS: Data from 8,449 participants aged 35 to 74 years from the ELSA-Brazil study were used. The effect of waist circumference (WC), waist-to-hip ratio (WHR), conicity index (C index), lipid accumulation product (LAP) and visceral adiposity index (VAI) on CIMT were evaluated. Data were stratified by gender and analyzed using multivariate linear and logistic regressions. A significance level of 5% was considered. RESULTS: Participants with CIMT > P75 showed a higher frequency of abdominal adiposity (men >72% and women >66%) compared to those with CIMT < P75. Abdominal adiposity was associated with the mean CIMT, mainly through WC in men (0.04; 95%CI: 0.033; 0.058). The abdominal adiposity identified by the WC, WHR, LAP, and VAI indicators in women showed an effect of 0.02 mm on the CIMT (WC: 0.025, 95%CI: 0.016, 0.035; WHR: 0.026, 95%CI: 0.016, 0.035; LAP: 0.024, 95%CI: 0.014; 0.034; VAI: 0.020, 95%CI: 0.010, 0.031). In the multiple logistic regression, the abdominal adiposity diagnosed by WC showed an important effect on the CIMT in both genders (men: OR = 1.47, 95%CI: 1.22-1.77, women: OR = 1.38; 95%CI: 1.17-1.64). CONCLUSION: Abdominal adiposity, identified through WC, WHR, LAP, and VAI, was associated with CIMT in both genders, mainly for the traditional anthropometric indicator, WC.

Indicators of Abdominal Adiposity and Carotid Intima-Media Thickness: Results from the Longitudinal Study of Adult Health (ELSA-Brazil) / Indicadores de Adiposidade Abdominal e Espessura Médio-Intimal de Carótidas: Resultados do Estudo Longitudinal de Saúde do Adulto - ELSA-Brasil

Abstract Background: Abdominal adiposity is a risk factor for cardiovascular disease. Objective: To determine the magnitude of the association between abdominal adiposity, according to five different indicators, and the carotid intima-media thickness (CIMT). Methods: Data from 8,449 participants aged 35 to 74 years from the ELSA-Brazil study were used. The effect of waist circumference (WC), waist-to-hip ratio (WHR), conicity index (C index), lipid accumulation product (LAP) and visceral adiposity index (VAI) on CIMT were evaluated. Data were stratified by gender and analyzed using multivariate linear and logistic regressions. A significance level of 5% was considered. Results: Participants with CIMT > P75 showed a higher frequency of abdominal adiposity (men >72% and women >66%) compared to those with CIMT < P75. Abdominal adiposity was associated with the mean CIMT, mainly through WC in men (0.04; 95%CI: 0.033; 0.058). The abdominal adiposity identified by the WC, WHR, LAP, and VAI indicators in women showed an effect of 0.02 mm on the CIMT (WC: 0.025, 95%CI: 0.016, 0.035; WHR: 0.026, 95%CI: 0.016, 0.035; LAP: 0.024, 95%CI: 0.014; 0.034; VAI: 0.020, 95%CI: 0.010, 0.031). In the multiple logistic regression, the abdominal adiposity diagnosed by WC showed an important effect on the CIMT in both genders (men: OR = 1.47, 95%CI: 1.22-1.77, women: OR = 1.38; 95%CI: 1.17-1.64). Conclusion: Abdominal adiposity, identified through WC, WHR, LAP, and VAI, was associated with CIMT in both genders, mainly for the traditional anthropometric indicator, WC.

Resumo Fundamento: A adiposidade abdominal é um fator de risco para doença cardiovascular. Objetivo: Determinar a magnitude da associação entre a adiposidade abdominal, segundo cinco diferentes indicadores, e a espessura médio-intimal de carótidas (EMI-C). Métodos: Usou-se dados de 8.449 participantes de 35 a 74 anos do ELSA-Brasil. Foi avaliado o efeito da circunferência da cintura (CC), razão cintura quadril (RCQ), índice de conicidade (Índice C), produto da acumulação lipídica (LAP) e índice de adiposidade visceral (IAV) sobre EMI-C. Os dados foram estratificados por sexo e analisados por meio de regressões linear e logística multivariadas. Foi adotado nível de significância de 5%. Resultados: Participantes com EMI-C acima do P75 mostraram maior frequência de adiposidade abdominal (homens acima de 72% e mulheres acima de 66%) em comparação aos participantes com EMI-C abaixo do P75. A adiposidade abdominal foi associada com a média da EMI-C, principalmente por meio da CC entre homens (0,04 IC95%: 0,033; 0,058). A adiposidade abdominal identificada pelos indicadores CC, RCQ, LAP e IAV entre as mulheres mostrou efeito de 0,02 mm sobre a EMI-C (CC: 0,025 IC95%: 0,016; 0,035; RCQ: 0,026 IC95%: 0,016; 0,035; LAP: 0,024 IC95%: 0,014; 0,034; IAV: 0,020 IC95%: 0,010; 0,031). Na regressão logística múltipla a adiposidade abdominal diagnosticada pela CC mostrou importante efeito sobre a EMI-C em ambos os sexos (homens: OR = 1,47; IC95%: 1,22-1,77; mulheres: OR = 1,38; IC95%: 1,17-1,64). Conclusão: A adiposidade abdominal, identificada por meio da CC, RCQ, LAP e IAV, foi associada à EMI-C em ambos os sexos, com destaque para o tradicional indicador antropométrico CC.

Factors associated with sarcopenia in institutionalized elderly.

INTRODUCTION: The sarcopenia is a negative aspect for the health of the elderly, increased the risk for disease and mortality. Additionally can contributes greatly to functional reducing capacity and quality of life. OBJECTIVE: To identify the prevalence and factors associated with sarcopenia in institutionalized elderly. METHODS: This is a cross-sectional study, conducted with 216 elderly people, aged ≥ 60 years, of both sexes, residents in long-term care facilities in Salvador-Bahia, Brazil. To identify sarcopenia was used the skeletal muscle Index. Covariates were considered: gender, age, time of institutionalization, type of institution, body mass index and functional capacity. The Association between sarcopenia and covariates was evaluated using the Poisson regression model with robust variance. RESULTS: The prevalence of sarcopenia in the elderly was 72.2% and this condition was associated with male sex (PR = 1,33; CI 95% = 1,081,65), thinness (PR = 1,29; CI 95% = 1,16-1,43) and obesity (PR = 0,37; CI 95% = 0,23-0,61). CONCLUSION: The prevalence of sarcopenia was high among the elderly living in long-term institutions, especially among men. Elderly with thinness showed greater impairment of muscle reserves, while the state of obesity was protective.

Correction: Factors Associated with Anemia in the Institutionalized Elderly.

[This corrects the article DOI: 10.1371/journal.pone.0162240.].

Factors Associated with Anemia in the Institutionalized Elderly.

As a common problem in long-term care facilities (LTCFs), anemia affects 25-63% of the elderly. The aim of the present study was to describe the prevalence and characteristics of anemia and its associated factors in the institutionalized elderly. The cross-sectional study was carried out with three hundred thirteen individuals aged ≥ 60 years, of both genders, living in long-term care facilities for the elderly in Salvador, Bahia, Brazil. Poisson regression (PR) with robust variance estimates was used to assess the factors related to anemia. The prevalence of anemia was 38%. Mild anemia was predominant in both genders (male: 26.8%; female: 21.1%), as normocytic and normochromic anemia, with no anisocytosis (69.75%). Anemia was associated with thinness (PR: 1.68; 95% CI: 1.04-2.72) and with moderate (PR: 1.98; 95% CI: 1.07-3.63) and total (PR: 2.61; 95% CI: 1.34-5.07) dependence in the final model. Severe dependence exhibited borderline significance (PR: 1.94; 95% CI: 1.00-3.77). The prevalence of anemia was high in the institutionalized elderly in both genders, with characteristics suggesting chronic diseases as the causal factor, and the frequency of occurrence was higher in thinness elderly with moderate to total dependence.

Anthropometric indicators associated with hypertriglyceridemia in the prediction of visceral fat / Indicadores antropométricos associados a hipertrigliceridemia na predição de gordura visceral

The accumulation of visceral fat is strongly associated with cardiometabolic changes. Alternative methods, such as the association between anthropometric indicators and hypertriglyceridemia, are used as the best estimate for the accumulation of visceral fat, preventing cardiovascular diseases. The aim of this study was to evaluate the association of anthropometric indicators with hypertriglyceridemia in the prediction of visceral fat in men and women. This was a cross-sectional study conducted with 192 individuals, of both genders, submitted to anthropometric evaluation (sagittal abdominal diameter [SAD], waist circumference [WC], and waist-hip ratio [WHR]), serum dosage of triglycerides (TG), and computed tomography scan, in order to measure the visceral adipose tissue (VAT) area. Descriptive analysis, Pearson's Correlation, and multiple linear regression were performed. Anthropometric indicators had high correlation with the VAT area (p=0.000). Regardless of serum TG levels, individuals with high values of anthropometric indicators had excess VAT area (p<0.05). For every centimeter increased in SAD, there was an average increase of 12.46 cm² in the VAT area. The study showed that both SAD and WC were good indicators to explain the variability in the VAT area, independently of changes in TG levels, making it possible to identify individuals with a risk of developing cardiovascular diseases.

O acúmulo de gordura visceral está fortemente associada com alterações cardiometabólicas. Métodos alternativos, como a associação de indicadores antropométricos e hipertrigliceridemia, são usados ​​como uma melhor estimativa para o acúmulo de gordura visceral, prevenindo doenças cardiovasculares. O objetivo foi avaliar a associação entre indicadores antropométricos com a hipertrigliceridemia para predição de gordura visceral em homens e mulheres. Estudo transversal, realizado com 192 indivíduos, de ambos os sexos, que foram submetidos à avaliação antropométrica (Diâmetro Abdominal Sagital -DAS, Circunferência da Cintura -CC e Relação Cintura-quadril -RCQ), dosagem sérica de triglicérides (TG) e tomografia computadorizada, a fim de medir a área do tecido adiposo visceral (ATAV). Análise descritiva, Correlação de Pearson e Regressão Linear Múltipla foram realizados. Indicadores antropométricos apresentaram alta correlação com a ATAV (p=0,000). Independente do nível sérico de TG, os indivíduos com indicadores antropométricos elevados tinham excesso de ATAV (p<0,05). Para cada aumento de um centímetro no DAS, houve um aumento médio de 12,46 cm² de ATAV. O estudo mostrou que ao mesmo tempo, DAS e CC foram os melhores indicadores para explicar a variabilidade na ATAV, independentemente de mudanças no nível de triglicérides, o que possibilitou a identificação de indivíduos com risco de desenvolver doenças cardiovasculares.

Evaluation of the accuracy of anthropometric clinical indicators of visceral fat in adults and elderly.

BACKGROUND: Visceral obesity is associated with higher occurrence of cardiovascular events. There are few studies about the accuracy of anthropometric clinical indicators, using Computed Tomography (CT) as the gold standard. We aimed to determine the accuracy of anthropometric clinical indicators for discrimination of visceral obesity. METHODS: Cross-sectional study with 191 adults and elderly of both sexes. Variables: area of visceral adipose tissue (VAT) identified by CT, Waist-to-Height Ratio (WHtR), Conicity index (C index), Lipid Accumulation Product (LAP) and Visceral Adiposity Index (VAI). ROC analyzes. RESULTS: There were a strong correlation between adiposity indicators and VAT area. Higher accuracy of C index and WHtR (AUC≥0.81) than the LAP and the VAI was observed. The higher AUC of LAP and VAI were observed among elderly with areas of 0.88 (CI: 0.766-0.944) and 0.83 (CI: 0.705-0.955) in men and 0.80 (CI: 0.672-0.930) and 0.71 (CI: 0.566-0.856) in women, respectively. The cutoffs of C index were 1.30 in elderly, in both sexes, with sensitivity ≥92%, the LAP ranged from 26.4 to 37.4 in men and from 40.6 to 44.0 in women and the VAI was 1.24 to 1.45 (sens≥76.9%) in men and 1.46 to 1.84 in women. CONCLUSION: Both the anthropometric indicators, C Index and WHtR, as well as LAP and VAI had high accuracy in visceral obesity discrimination. So, they are effective in cardiovascular risk assessment and in the follow-up for individual and collective clinical practice.

Hypertriglyceridemic waist phenotype: association with metabolic disorders and visceral fat in adults.

OBJECTIVE: To evaluate the association of Hypertriglyceridemic waist with metabolic disorders and visceral fat in adults. METHODS: Cross-sectional study with 191 individuals of both sexes. Subjects were grouped according to Waist Circumference (WC) ratings (Men: > 90 cm; Women: > 80 cm) and triglycerides (TG) (> 150 mg/dl) in Group 1 (HTW Phenotype): elevated WC and TG; Group 2 (absence of HTW Phenotype): elevated WC and normal TG or normal WC and elevated TG or normal WC and TG. Metabolic alternations, visceral adipose tissue (VAT) and visceral/subcutaneous fat index (VF/SF) measured by computed tomography were evaluated as cardiovascu - lar risk factors between the groups. RESULTS: Individuals with HTW phenotype, 82% had three or more cardiovascular risk factors. The association between cardiovascular risk factors with HTW phenotype revealed that among men 73.7% had hypercholesterolemia, 94.9% elevated non-HDLc and 78.9% excess of VAT area (p = 0.001). Among women, 65% had elevated Sistolic Blood Plessure, 80% hypercholesterolemia and 90% elevated non-HDLc (p < 0.02). CONCLUSION: The HTW phenotype associated with the metabolic alternations and VAT excess. Individuals with HTW had higher number of cardiovascular risk factors. The Hypertriglyceridemic waist can be used in clinical practice for investigating cardiovascular risk and visceral adipose tissue in individuals.

OBJETIVO: Evaluar la relación entre Cintura Hipertrigliceridémica (CHT) con cambios metabólicos y grasa visceral en adultos. MÉTODOS: Estudio transversal con 191 personas de ambos sexos. Los participantes fueron agrupados según clasificación de Circunferencia de Cintura (CC) (Hombres: > 90 cm; Mujeres: > 80 cm) y triglicéridos séricos (TG) (>150 mg/dl) en el Grupo 1 (Fenotipo CHT): Elevación en CC y TG; Grupo 2 (ausencia del Fenotipo CHT): Aumento en CC y TG normal, o CC normal y TG elevado o CC y TG normales. Cambios metabólicos, área del tejido adiposo visceral (TAV) y índice de grasa visceral/subcutáneo (GV/GS), medidas por tomografía computadorizada, fueron evaluados como factores de riesgo cardiovascular entre los grupos. RESULTADOS: De los participantes con el Fenotipo CHT, 82% presentaban tres o más factores de riesgo cardiovascular. La relación entre los factores de riesgo cardiovascular y el Fenotipo CHT demostró que entre los hombres 73,7% presentaban hipercolesterolemia, 94,9% no- HDLc elevado y 78,9% exceso de área TAV (p = 0,001). Entre las mujeres, 65% presentaban presión arterial sistólica alta, 80% hipercolesterolemia y 90% no-HDLc elevado (p < 0,02). CONCLUSIÓN: El Fenotipo CHT se relacionó con cambios metabólicos y exceso de TAV. Personas con CHT presentaron más factores de riesgo cardiovascular. La Cintura Hipertrigliceridémica puede ser utilizada en la práctica clínica para investigar el riesgo cardiovascular y el depósito del tejido adiposo visceral en las personas.

Discriminatory power of indicators predictors of visceral adiposity evaluated by computed tomography in adults and elderly individuals.

INTRODUCTION: Identifying anthropometric methods of abdominal adiposity, predictors of excess area of visceral adipose tissue (VAT) allows rapid and low cost evaluation for the risk of cardiovascular diseases in the elderly. OBJECTIVE: To evaluate the discriminatory power of anthropometric indicators for detection of excess of the area of VAT. METHODS: Cross-sectional study comprising 194 adults and elderly individuals for comparison of both sexes and age groups. Anthropometric variables: waist-to-height Ratio (WHtR), waist-tothigh Ratio (WTR), Abdominal Diameter Index (ADI) and Sagittal Abdominal Diameter Height Index (SAD/Height). The VAT area was identified by computed tomography (CT). Analysis with the ROC curve. RESULTS: There was a high correlation between the VAT area and most of the anthropometric indicators (p ≤0.001). Among elderly men, WHtR showed areas under the ROC curve over 0.90 and cutoff of 0.55 (sens: 85.7%; spec: 82.4%, PPV: 99.9%). For older women, the WHtR cutoff was 0.58 (sens: 81.0%; spec: 78.6%). For the SAD/Height, the areas under the ROC curve were ≥0.83 (p ≤0.01), with cutoffs of 0.12 for men and 0.13 for women. CONCLUSION: There was a strong discriminatory power of the anthropometric indicators abdominal visceral obesity. The WHtR and SAD/Height showed better performance to predict the VAT area of risk in elderly, without the need of measuring it by computed tomography.

Introducción: La identificación de métodos antropométricos de adiposidad abdominal, los predictores de exceso del tejido adiposo visceral (TAV) permiten una evaluación rápida y de bajo costo del riesgo de enfermedades cardiovasculares en ancianos. Objetivo: Evaluar el poder discriminatorio de los indicadores antropométricos para la detección de exceso del tejido adiposo visceral. Métodos: Estudio transversal compuesto por 194 adultos y ancianos para la comparación entre ambos sexos y por grupos de edad. Las variables antropométricas: Razón cintura/estatura (RCE), Razón cintura/muslo (RCM), el Índice Diámetro Abdominal (SAD/muslo) e el Índice diámetro abdominal altura (SAD/estatura). El área TAV fue identificado por tomografía computarizada. Análisis con la curva ROC. Resultados: Se observó una alta correlación entre el área del tejido adiposo visceral y la mayoría de los indicadores antropométricos (p ≤0,001). Entre los hombres de edad avanzada, la razón cintura/estatura mostró áreas bajo la curva ROC por encima de 0,90 y puntos de corte de 0,55 (sens: 85,7%, espec: 82,4%, VPP: 99,9%). Para las mujeres de edad avanzada, el corte fue de 0,58 (sens: 81,0%, espec: 78,6%). Para SAD/estatura, las áreas bajo la curva ROC fueron ≥0,83 (p ≤0,01), con puntos de corte de 0,12 para hombres y 0,13 para las mujeres. Conclusión: Había se ha observado un fuerte poder discriminatorio de los indicadores antropométricos de obesidad abdominal visceral. La Razón cintura/altura y el diámetro abdominal estatura mostraron un mejor desempeño para predecir la área de TAV de riesgo en los ancianos, sin la necesidad de medirla por tomografía computarizada.

[Bioelectrical impedance and visceral fat: a comparison with computed tomography in adults and elderly]. / Bioimpedância elétrica e gordura visceral: uma comparação com a tomografia computadorizada em adultos e idosos.

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 cm² 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.

Bioimpedância elétrica e gordura visceral: uma comparação com a tomografia computadorizada em adultos e idosos / Bioelectrical impedance and visceral fat: a comparison with computed tomography in adults and elderly

OBJETIVO: 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 cm² 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.

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 cm² 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.

Bioimpedância elétrica e sua aplicação em avaliação nutricional / Bioelectric impedance analysis and its use for nutritional assessments

A busca por métodos de estimativa da composição corporal é uma preocupação constante da comunidade científica, com vistas à obtenção de um acurado diagnóstico do estado nutricional de indivíduos e populações. A bioimpedância elétrica tem sido uma alternativa atraente na avaliação da composição corporal, pela possibilidade de se trabalhar com equipamento não invasivo, portátil, de fácil manuseio, boa reprodutibilidade e, portanto, viável para a prática clínica e para estudos epidemiológicos. Sua utilização, que tem como finalidade determinar o fracionamento da composição corporal, tem sido apontada como uma técnica capaz de superar alguns desafios encontrados em outros métodos para avaliar o estado nutricional. Entre os componentes da bioimpedância elétrica, o ângulo de fase consiste em uma ferramenta cada vez mais utilizada na prática clínica, sendo estudado como indicador prognóstico e de estado nutricional. Esse ângulo indica alterações na composição corporal e na função da membrana celular, portanto, no estado de saúde de indivíduos. Dada a carência de estudos brasileiros sobre determinadas aplicações da bioimpedância elétrica, a proposta deste estudo, buscando contribuir com a literatura, é traçar um panorama sobre o emprego dessa técnica e, ainda, apresentar trabalhos que a comparam com outros métodos de avaliação nutricional e composição corporal.

The scientific community is always searching for methods that estimate body composition because of the importance of making accurate nutritional status diagnoses of individuals and populations. Bioelectrical impedance analysis Bioelectrical impedance is an attractive alternative for determining body composition because it is noninvasive, portable, easy to handle and has good reproducibility, and therefore, is viable for clinical practice and epidemiological studies. Bioelectrical impedance whose purpose is the determination of body composition, has been pointed out as capable of overcoming some challenges present in other methods that assess nutritional status. Among Bioelectrical impedance components, the use of phase angle in clinical practice has been increasing, since it is used as an indicator of prognosis and nutritional status. This angle detects changes in body composition and cell membrane function, hence, in health status. In Brazil, there is a scarcity of studies on some Bioelectrical impedance applications. In order to contribute to the available literature, this study aimed to draw an overview about the use of this technique and present studies that compare Bioelectrical impedance with other nutritional and body composition assessment methods.

Methods of predicting visceral fat in Brazilian adults and older adults: a comparison between anthropometry and computerized tomography.

Visceral adipose tissue (VAT) is linked with the metabolic consequences of obesity, being necessary the use alternative methods of predicting this type of fat, like anthropometry. The objective of this study was assess the performance of anthropometry in predicting visceral fat measured with computerized tomography in adults and older adults. Study transversal with 197 individuals underwent computerized tomography (CT) and anthropometry. The variables analized were: visceral adipose tissue area by CT, Sagittal Abdominal Diameter (SAD), Waist Circumference (WC) and Waist-Hip Ratio (WHR). A descriptive analysis, Pearson correlation and ROC curve were carried out. We observed Correlations higher than 0.7 (p = 0.000) between the SAD, WC and the VAT area were found in adult men and older men and in adult women. WHR displayed the least correlations. The most sensitive and specific SAD cut-off points were equal for all the men (Adults: 20.2 cm/Older adults: 20.2 cm) but different for the women (Adults: 21.0 cm; sens.: 83.3; spec.: 79.1/Older adults: 19.9 cm; sens.: 81.0; spec.:79.3). The WC cutoff points that identified a VAT area = 130 cm2 were 90.2 cm and 92.2 cm for men (adult men--sens.: 86.7; spec.: 86.1--and older men-sens.: 79.3; spec.: 77.8 -respectively), while for women the recorded values were 92.3 cm (adult women--sens.: 83.3; spec: 81.4) and 88.2 cm (older women--sens.:76.2; spec.: 69.0). This study showed that WC and SAD achieved the best performance in the identification of visceral fat considered at risk for the development of cardiometabolic diseases in adults and older adults.

Methods of predicting visceral fat in Brazilian adults and older adults: a comparison between anthropometry and computerized tomography

Visceral adipose tissue (VAT) is linked with the metabolic consequences of obesity, being necessary the use alternative methods of predicting this type of fat, like anthropometry. The objective of this study was assess the performance of anthropometry in predicting visceral fat measured with computerized tomography in adults and older adults. Study transversal with 197 individuals underwent computerized tomography (CT) and anthropometry. The variables analized were: visceral adipose tissue area by CT, Sagittal Abdominal Diameter (SAD), Waist Circumference (WC) and Waist-Hip Ratio (WHR). A descriptive analysis, Pearson correlation and ROC curve were carried out. We observed Correlations higher than 0.7 (p=0.000) between the SAD, WC and the VAT area were found in adult men and older men and in adult women. WHR displayed the least correlations. The most sensitive and specific SAD cut-off points were equal for all the men (Adults: 20.2 cm /Older adults: 20.2 cm) but different for the women (Adults: 21.0 cm; sens.: 83.3; spec.: 79.1 /Older adults: 19.9 cm; sens.: 81.0; spec.:79.3). The WC cut-off points that identified a VAT area =130cm² were 90.2 cm and 92.2 cm for men (adult men - sens.: 86.7; spec.: 86.1 - and older men- sens.: 79.3; spec.: 77.8 -respectively), while for women the recorded values were 92.3 cm (adult women- sens.: 83.3; spec: 81.4) and 88.2 cm (older women - sens.:76.2; spec.: 69.0).This study showed that WC and SAD achieved the best performance in the identification of visceral fat considered at risk for the development of cardiometabolic diseases in adults and older adults.

Tejido adiposo visceral (TAV) está vinculado con las consecuencias metabólicas de la obesidad, siendo necesario el uso de métodos alternativos de predicción de este tipo de grasa, como la antropometría. El objetivo de este estudio fue evaluar el desempeño de la antropometría en la predicción de la grasa visceral medido con tomografía computarizada en adultos y adultos mayores. Estudio transversal con 197 individuos sometidos a tomografía computarizada y la antropometría. Las variables fueron: área de TAV, diámetro abdominal sagital (DAS), circunferencia de cintura (CC) y el índice cintura-cadera (RCC). Análisis descriptivo, de correlación de Pearson y la Curva ROC se llevaron a cabo. Hemos observado correlaciones superiores a 0,7 (p=0,000) entre el DAS, CC y TAV en los hombres adultos y adultos mayores y en mujeres adultas. RCC muestren la mínima correlación. Los puntos de corte de DAS más sensible y específico son iguales para los hombres (adultos y adultos mayores: 20,2cm), pero diferente para las mujeres (Adultos: 21,0cm - sens.:83.3; espec.:79.1 /adultos mayores: 19,9cm - sens.: 81.0; espec.: 79.3). El CC de los puntos de corte fueron de 90,2cm y 92,2cm para los hombres (Hombres adultos- sens.: 86.7; espec.: 86.1- y los hombres mayores - sens.: 79.3; espec.: 77.8, respectivamente), mientras que para las mujeres los valores registrados fueron de 92.3cm (mujeres adultas- sens.: 83.3; espec.:81.4) y 88.2cm (mujeres mayores- sens.: 76.2; espec.:69.0). Este estudio mostró que la CC y el DAS lograr el mejor rendimiento en la identificación de la grasa visceral considerados de riesgo para el desarrollo de enfermedades cardiometabólicas en los adultos y adultos mayores.