Abstract Introduction: body fat reflects important clinical impacts among hemodialysis patients; thus, simple and safe methods are required for a careful evaluation of this body compartment. Objectives: to evaluate the concordance of estimates of total body fat percentage (%BF), calculated using bioelectrical impedance analysis (BIA) and sum of four skinfolds (SSKD) measures, with those obtained using dual-energy X-ray absorptiometry (DEXA) in patients with chronic kidney disease (CKD) receiving hemodialysis. Methods: a cross-sectional study was conducted in 317 patients undergoing hemodialysis. The %BF was evaluated using BIA, SSKD measurement, and DEXA, and stratified by sex and tertiles. The Wilcoxon test for paired samples was used to compare the %BF obtained using the different methods, and Lin's concordance correlation coefficient (CCC-L) to evaluate concordance. Results: the average %BF estimated using DEXA was 29.3 ± 9.3 %, with significant differences among the three methods (p < 0.05). SSKD measurement presented a higher CCC-L concordance with DEXA, regardless of sex. After stratification of the sample in tertiles, BIA presented a higher CCC-L concordance with DEXA among the patients with CKD with a %BF above 34.4 % (third tertile). Conversely, SSKD measurement presented better concordance with DEXA for those with a %BF equal to or less than 34.4 %. Conclusions: in terms of the estimates of the %BF, SSKD measurement displayed a better concordance with DEXA.

Resumen Introducción: la grasa corporal refleja importantes impactos clinicos entre los pacientes en hemodialisis; por lo tanto, se requieren metodos simples y seguros para una evaluacion cuidadosa de este compartimiento del cuerpo. Objetivos: evaluar la concordancia de las estimaciones del porcentaje de grasa corporal total (%GC), calculadas mediante el analisis de impedancia bioelectrica (BIA) y la suma de las medidas de cuatro pliegues cutaneos (CPC), con las obtenidas mediante absorciometria dual energetica de rayos X (DEXA) en pacientes con enfermedad renal cronica (ERC) que reciben hemodialisis. Métodos: se realizo un estudio transversal en 317 pacientes en hemodialisis. La %GC se evaluo mediante BIA, medicion de CPC y DEXA, y se estratifico por sexos y terciles. Se utilizo la prueba de Wilcoxon para muestras pareadas para comparar los %GC obtenidos con los diferentes metodos, y el coeficiente de correlacion de concordancia de Lin (CCC-L) para evaluar la concordancia. Resultados: el %GC promedio estimado usando DEXA fue del 29,3 ± 9,3 %, con diferencias significativas entre los tres metodos (p < 0,05). La medicion de los CPC presento una mayor concordancia de CCC-L con DEXA, independientemente del sexo. Tras la estratificacion de la muestra en terciles, la BIA presento una mayor concordancia de CCC-L con DEXA entre los pacientes con ERC con un %GC superior al 34,4 % (tercer tercil). Por el contrario, la medicion de los CPC presento una mejor concordancia con la DEXA para aquellos con un %GC igual o inferior al 34,4 %. Conclusión: en terminos de las estimaciones del %GC, la medicion de los CPC mostro una mejor concordancia con la DEXA.

Abstract Introduction: in individuals with chronic kidney disease, sarcopenia is prevalent and is associated with increased morbidity and mortality, and the occurrence of cardiovascular complications. Objective: to verify the relationship between sarcopenia and inflammation in hemodialysis patients. Methods: a cross-sectional study with 209 patients in five hemodialysis units. Demographic, socioeconomic, body composition, clinical laboratory, and functional data were collected. Sarcopenia was diagnosed according to the European Working Group on Sarcopenia in Older People (grip strength < 27 kg for men and < 16 kg for women; DEXA muscle mass < 7.0 kg/m² for men and < 5.5 kg/m² for women). Inflammation was assessed by C-reactive protein. Results: mean age was 51.9 ± 15.0 years, with a predominance of males (59.3 %). The prevalence of sarcopenia was 29.1 % and that of inflammation was 50.2 %. A Poisson regression analysis showed that sarcopenia was associated with increased hsCRP values (PR: 1.06; 95 % CI: 1.01-1.10; p-value = 0.005); BMI (PR: 0.74; 95 % CI: 0.65-0.84; p-value < 0.001); age (PR: 1.02; 95 % CI: 1.00-1.03; p < 0.001); male (PR: 5.75; 95 % CI: 3.20-10.34; p-value < 0.001); presence of diabetes mellitus (DM) (PR: 1.87; 95 % CI: 1.27-2.74; p-value < 0.001); % body fat (PR: 1.07; 95 % CI: 1.04-1.09; p-value < 0.001). Conclusion: the prevalence of sarcopenia can be considered high in this study, as well as inflammation. Being inflamed, presence of DM, being male, increasing age, and % body fat were risk factors for sarcopenia. On the other hand, increased BMI had a protective role.

Resumen Introducción: en individuos con enfermedad renal crónica, la sarcopenia es prevalente y está asociada a un aumento de la morbilidad y la mortalidad, y a la aparición de complicaciones cardiovasculares. Objetivo: verificar la relación entre sarcopenia e inflamación en pacientes en hemodiálisis. Métodos: estudio transversal de 209 pacientes en cinco unidades de hemodiálisis. Se recopilaron datos demográficos, socioeconómicos, de composición corporal, laboratorio clínico y funcional. La sarcopenia se diagnosticó conforme al Grupo de Trabajo Europeo sobre Sarcopenia en Personas Mayores (fuerza de agarre < 27 kg para hombres y < 16 kg para mujeres; masa muscular DEXA < 7.0 kg/m² para hombres y < 5.5 kg/m² para mujeres). La inflamación se evaluó mediante la proteína C-reactiva. Resultados: la edad media fue de 51,9 ± 15,0 años, con predominio de varones (59,3 %). La prevalencia de la sarcopenia fue del 29,1 % y la de la inflamación del 50,2 %. El análisis de regresión de Poisson mostró que la sarcopenia se asociaba con un aumento de los valores de hsCRP (PR: 1,06; IC del 95 %: 1,01-1,10; valor de p = 0,005); IMC (PR: 0,74; IC del 95 %: 0,65-0,84; valor p < 0,001); edad (PR: 1,02; IC 95 %: 1,00-1,03; p < 0,001); hombre (PR: 5,75; IC 95 %: 3,20-10,34; valor p < 0,001); presencia de diabetes mellitus (DM) (PR: 1,87; IC 95 %: 1,27-2,74; valor p < 0,001); % de grasa corporal (PR: 1,07; IC 95 %: 1,04-1,09; valor p < 0,001). Conclusión: la prevalencia de la sarcopenia puede considerarse alta en este estudio, así como la inflamación. Tener inflamación, la presencia de DM, ser hombre, la mayor edad y el % de grasa corporal resultaron ser factores de riesgo de sarcopenia. Por otro lado, el aumento del IMC tuvo un papel protector.

RESUMO O objetivo foi avaliar a associação entre o estado nutricional e a taxa de filtração glomerular (TFG) em remanescentes quilombolas. Estudo transversal, realizado em 32 comunidades remanescentes de quilombolas, no município de Alcântara - MA. Os indicadores nutricionais (IN) utilizados foram: índice de massa corporal (IMC); circunferência da cintura (CC); relação cintura-quadril (RCQ); relação cintura-estatura (RCEst); índice de conicidade (Índice C) e tecido adiposo visceral estimado (TAVe). A TFG foi estimada a partir da fórmula do CKD-EPI creatinina-cistatina C. O teste Shapiro Wilk foi utilizado para avaliar a normalidade das variáveis quantitativas. Para comparar os IN segundo sexo foi aplicado o teste qui-quadrado. Os testes Anova ou Kruskal-Wallis foram usados para verificar a associação entre os IN e a TFG. Dos 1.526 remanescentes quilombolas estudados, 89,5% eram da cor preta ou parda, 51,2% eram mulheres, 88,6% pertenciam às classes econômicas D e E e 61,2% eram lavradores ou pescadores. A investigação clínica revelou 29,2% de hipertensos, 8,5% de diabéticos e 3,1% com TFG reduzida. O IMC revelou 45,6% dos remanescentes quilombolas com excesso de peso. Quando comparadas aos homens, as mulheres apresentaram maior prevalência de excesso de peso pelo IMC (56,6% vs. 33,8%; p <0,001) e obesidade abdominal CC (52,3% vs. 4,3%), RCQ (76,5% vs. 5,8%), RCEst (82,3% vs. 48,9%) e TAVe (27,1% vs. 14,5%) (p<0,001). Comparando as médias dos IN segundo a TFG observou-se que, quanto maior o valor médio dos IN, menor a TFG (p<0,05). A TFG foi reduzida com o aumento dos valores médios dos indicadores nutricionais de obesidade abdominal, independentemente do sexo.

SUMMARY The objective was to evaluate the association between nutritional status and the glomerular filtration rate (GFR) in remaining quilombolas. Cross-sectional study carried out on 32 remaining quilombola communities in the municipality of Alcântara-MA. The nutritional indicators (IN) used were: body mass index (BMI); Waist circumference (WC); Waist-to-hip ratio (WHR); Waist-to-height ratio (WHtR); conicity index (CI) and estimated visceral adipose tissue (VAT). GFR was estimated from the CKD-EPI creatinine-cystatin C formula. The Shapiro Wilk test was used to evaluate the normality of the quantitative variables. In order to compare the second IN sex, the chi-square test was applied. The Anova or Kruskal-Wallis tests were used to verify the association between IN and GFR. Of the 1,526 remaining quilombolas studied, 89.5% were black or brown, 51.2% were women, 88.6% belonged to economic classes D and E and 61.2% were farmers or fishermen. Clinical investigation revealed 29.2% of hypertensive patients, 8.5% of diabetics and 3.1% with reduced GFR. The BMI revealed 45.6% of the remaining quilombolas with excess weight. When compared to men, women presented a higher prevalence of overweight by BMI (56.6% vs 33.8%, p <0.001) and abdominal obesity CC (52.3% vs 4.3%), WHR (76,5% vs 5.8%), WHtR (82.3% vs 48.9%) and VAT (27.1% vs 14.5%) (p <0.001). Comparing the means of IN according to the GFR, it was observed that the higher the mean value of the IN lower the GFR (p <0.05). The GFR reduced with increasing mean values of nutritional indicators of abdominal obesity, regardless of sex.