Body Composition Assessment in Mexican Children and Adolescents. Part 2: Cross-Validation of Three Bio-Electrical Impedance Methods against Dual X-ray Absorptiometry for Total-Body and Regional Body Composition.

The aim of our study was to validate three different bioelectrical impedance analysis (BIA) methods for estimating body composition (BC). First, we generated BIA prediction equations based on the 4-C model as the reference method for fat mass (FM) and fat-free mass (FFM), and on dual X-ray absorptiometry (DXA) estimations of appendicular lean mass (ALM) and truncal fat mass (tFM). Then, we performed cross-validation in an independent BMI-, sex-, and Tanner-stratified sample of 450 children/adolescents. The three BIA methods showed good correlation and concordance with DXA BC estimations. However, agreement analyses showed significant biases, with increasing subestimations of FM and tFM, and overestimations of ALM, by all three BIA methods. In conclusion, the three BIA methods analysed in this study, provide valid estimations of BC for total body and body segments, in children and adolescents who are of a healthy weight, overweight, or obese. It should be noted that this validation cannot be extrapolated to other BIA methods.

Resistance but not elastic tubes training improves bioimpedance vector patterns and body composition in older women: A randomized trial.

The present study aimed to investigate the effects of traditional resistance training compared to elastic tubes training on bioimpedance vector patterns, body composition, and strength in older women. Thirty-eight older women (age 68.7 ±â€¯6.9 years, body mass index 28.8 ±â€¯7.2 kg/m2) were randomly assigned to perform traditional resistance or elastic tubes training three times per week for 12 weeks. Body composition was assessed by dual energy X-ray absorptiometry and bioelectrical impedance vector analysis. In addition, handgrip strength was measured using a dynamometer. Only the participants who followed the 12-week traditional resistance training program significantly (p < 0.05) decreased fat mass (ES: -0.69) and extracellular water (ES: -1.06), and increased total body water (ES: 0.49), intracellular water (ES: 1.11), body cell mass (ES: 0.82), muscle mass (ES: 0.94), and phase angle (ES: 0.99), while no change occurred in the elastic tubes training group. Furthermore, a vector leftward displacement (ES: 1.11) into the resistance-reactance graph was found only after the traditional resistance training program. The handgrip strength increased for both traditional and elastic tubes training groups (ES: 0.64, ES: 0.71, respectively). Traditional resistance training improved body composition and strength in the older women group, while training using elastic tubes was effective only for the latter. The present outcomes encourage the use of systematic resistance training to counteract the effects of aging in older women.

Body composition in Spinocerebellar ataxia type 3 and 10 patients: Comparative study with control group.

Background: Spinocerebellar ataxias (SCAs) are a group of neurodegenerative genetic diseases characterized by movement disorders that can affect nutritional status and body composition. This study sought to assess body composition in SCA3 and SCA10 patients. Methods: Anthropometric assessments and bioelectric impedance analysis were performed in 46 SCA3 and SCA10 patients and 76 controls of both genders. Results: Of the patients, 69.6% had SCA3 and 58.7% were women. SCA3 patients had significantly lower percentages of body fat (%BF) than controls (15.0 ± 6.1 vs. 20.6 ± 7.1; p=0.014) and (22.4 ± 6.9 vs. 30.1 ± 6.0; p<0.001), respectively. Among the women, there was a statistically significant difference in %BF between SCA3 and SCA10 patients (22.4 ± 6.9 vs. 32.4 ± 4.9; p<0.001). Male and female SCA3 patients had significantly lower fat-free mass (FFM) than controls [50.6 kg (46.9-54.7) vs. 58.6 kg (52.6-63.9); p=0.001] and [38.2 kg (35.1-42.6) vs. 42.8 kg (39.7-46.1); p=0.004], respectively. Male SCA10 patients also had lower FFM than controls [51.2 kg (47.1-55.4) vs. (52.6-63.9); p=0.008]. Female SCA10 patients had significantly higher FFM than controls and SCA3 patients [45.0 kg (43.3-45.6) vs. 42.8 kg (39.7-46.1); p=0.004] and [45.0 kg (43.3-45.6) vs. 38.2 kg (35.1-42.6); p=0.004], respectively. There was moderate correlation (-0.42) between disease duration and muscle mass (MM), and weak (-0.38) between SARA (Scale for the Assessment and Rating of Ataxia) and MM in SCA3. In SCA10, there was no significant correlation between these variables. Conclusion: Female SCA3 patients had more body composition changes than female SCA10 patients, mainly in relation to FFM. SCA3 and SCA10 patients need nutritional follow-up to minimize body compartment changes.

Ecuaciones para la estimación del agua corporal total por el método de análisis de impedancia bioeléctrica a 50 kHz / Equations for the estimate of total body water by the method of bioelectric impedance at 50 kHz

Introducción: El agua mantiene un rango normal en personas aparentemente sanas, el cual se altera ante la existencia de diversas enfermedades. Objetivo: Conocer cuánto se diferencian los valores de agua corporal total estimados por las ecuaciones de agua corporal total, de Kushner, de Deurenberg y de Heitman, con respecto a los obtenidos clínicamente por el método de impedancia bioeléctrica a 50 kHz. Métodos: Se realizó un estudio descriptivo y transversal, de abril a diciembre del 2018, en 62 individuos: 31 adultos aparentemente sanos y 31 niños y adolescentes con diferentes enfermedades, ingresados en el Hospital Infantil Docente Sur Dr. Antonio María Béguez César de Santiago de Cuba (24 en el Servicio de Misceláneas y 7 en el de Oncopediatría). El agua corporal total y los parámetros bioeléctricos se estimaron con el analizador de impedancia bioeléctrica Bodystat® 1500-MDD, a 50 kHz, por el método tetrapolar ipsilateral derecho. Se utilizó el criterio de Bland-Altman, para un 95 % de confianza, a fin de conocer si las ecuaciones de Kushner, de Deurenberg y de Heitman podían sustituir a la ecuación de referencia. Resultados: Las ecuaciones de agua corporal total, de Kushner y de Deurenberg no mostraron diferencias significativas respecto a la ecuación de referencia, mientras que la ecuación de Heitman sí presentó diferencias significativas en relación con el resto de las ecuaciones. El método de Bland-Altman demostró que la ecuación de Kushner posee mayor concordancia con la ecuación de referencia. Conclusiones: La ecuación de Kushner es la de mayor exactitud para la estimación del agua corporal total en personas sanas y en las afectadas por entidades clínicas.

Introduction: The water maintains a normal range in apparently healthy people, which changes with the existence of diverse diseases. Objective: To know how the values of total body water estimated by Kushner, Deurenberg and Heitman equations of total body water, differ regarding those obtained clinically by the method of bioelectric impedance at 50 kHz. Methods: A descriptive and cross-sectional study was carried out, from April to December, 2018, in 62 individuals: 31 apparently healthy adults and 31 children and adolescents with different diseases, admitted to "Dr. Antonio María Béguez César" Southern Teaching Children Hospital in Santiago de Cuba (24 in the Miscellaneous Service and 7 in Oncopediatrics Service). The total body water and the bioelectric parameters were considered with the analyzer of bioelectric impedance Bodystat® 1500-MDD, at 50 kHz, for the right ipsilateral tetrapolar method. The approach of Bland-Altman was used, for 95% of confidence in order to know if Kushner, Deurenberg and Heitman equations could substitute the reference equation. Results: Kushner and Deurenberg equations of total body water didn't show significant differences regarding the reference equation, while Heitman equation presented significant differences related to the rest of the equations. The Bland-Altman method demonstrated that the equation of Kushner has higher concordance with the reference equation. Conclusions: Kushner equation has the highest accuracy for the estimate of total body water in healthy people and in those affected by diseases.

The Prognostic Role of Phase Angle in Advanced Cancer Patients: A Systematic Review.

Phase angle (PA) is a ratio between the reactance and resistance obtained by bioelectric impedance analysis and has been interpreted as a cell membrane integrity indicator and a predictor of total body cell mass. A low PA may suggest deterioration of the cell membrane, which in advanced cancer patients may result in a reduced overall survival (OS). This systematic review sought to investigate the current evidence regarding whether there is an association between PA and OS in patients with advanced cancer (ie, metastatic disease). The search was conducted on electronic databases in August 2017. A total of 34 articles were identified in the initial literature search. Nine studies reporting on 1496 patients were deemed eligible according to our inclusion criteria. PA data were analyzed as continuous variables or according to different cutoffs, under a frequency of 50 Khz. Low PA was associated with worse nutrition status evaluated by body mass index, serum albumin level, transferrin, and fat-free mass. The median OS of the included papers varied from 25.5-330 days, and all studies analyzed showed a significant association between PA and OS, in that patients with low PA had worse OS. Future studies are necessary to justify the use of PA in therapeutic decisions for this population and to evaluate whether nutrition status can influence the association between PA and survival.

Uso de indicadores antropométricos para avaliação da adiposidade corporal em idosos no sul do Brasil / Using of the anthropometrics indicators to evaluate of body adiposity in the elderly in Southern Brazil

Introdução: A composição corporal e sua distribuição sofrem mudanças conforme a idade. Por isso, avaliar o uso de indicadores antropométricos para avaliação da adiposidade corporal em idosos é de extrema importância. Método: Trata-se de um estudo transversal, realizado com 108 idosos cadastrados em 11 unidades básicas de saúde do município de Pelotas-RS integrantes da Estratégia Saúde da Família. Para a avaliação nutricional, foram aferidos: altura, peso, circunferência da cintura e circunferência do quadril. O percentual de gordura corporal (%GC) foi verificado por bioimpedância (BIA) e pelo índice de Adiposidade Corporal (IAC) calculado conforme proposto por Bergman et al. Resultados: Os idosos apresentaram médias %GC, verificado pelos dois indicadores BIA e IAC, acima do recomendado (38,5 e 35,6, respectivamente). Conclusão: São necessárias mudanças no estilo de vida destes idosos, incentivando o consumo alimentar saudável e a pratica de atividade física.

Marcadores do estado nutricional associados ao prognóstico de pacientes portadores de miocardiopatia dilatada internados em unidade de terapia intensiva de hospital referenciado: um estudo piloto / Markers of nutritional status associated with the prognosis of patients with dilated cardiomyopathy hospitalized in a referral hospital intensive therapy unit: a pilot study

Introdução: A avaliação nutricional de pacientes com insuficiência cardíaca (IC) é um desafio na prática clínica. A presença de caquexia cardíaca está relacionada com piores resultados e redução da sobrevida, enquanto excesso de peso e colesterol elevado são fatores protetores de mortalidade nos pacientes com IC. Nesse contexto, o objetivo do trabalho é estudar marcadores do estado nutricional de pacientes portadores de miocardiopatia dilatada com IC grau III e IV internados em unidade de terapia intensiva de hospital referenciado do estado de São Paulo. Método: Pesquisa prospectiva e observacional, com avaliação subjetiva global (ASG), antropometria (índice de massa corporal -IMC, prega cutânea tricipital -PCT, circunferência do braço ­CB, e circunferência muscular do braço -CMB), bioquímica (proteínas totais, albumina, linfócitos, hemoglobina (Hb), lipídeos e BNP), impedância bioelétrica (IB) e análise dos desfechos obtidos. Para estatística, foram aplicados testes t de Student, correlação de Pearson e Análise de Variância, adotando-se como significante p≤0,01. Resultados: 24 pacientes com idade média de 48,25±18,05, sendo 62,5% (n=15) homens e 37,5% (n=9) idosos. Pela ASG, 60,8% estavam denutridos, pelo IMC, 33,3% baixo peso e 41,7% eutróficos; por meio das medidas de CB, CMB e PCT, estavam desnutridos 75%, 66,7% e 50% da amostra, respectivamente. Em relação às dosagens bioquímicas, 83,3% apresentavam depleção pela contagem total de linfócitos, 75% anemia, 79,2% hipoalbuminemia, 41,6% deficiência de ferro e 75% valores reduzidos de colesterol total (<160 md/dL). O valor médio do ângulo de fase encontrado foi 5,22º±1,66º, sendo para adultos 5,05º±1,49 e para idosos 5,52º±1,80. Foi verificada correlação negativa significativa entre albumina e ângulo de fase. Conclusão: Avaliação nutricional periódica no IC grave é essencial para prevenir maus resultados, uma vez que existem diferenças significativas conforme fases da doença e estados de desnutrição, bem como valores baixos de colesterol podem auxiliar precedendo maus resultados.

Body Composition in Children with Chronic Illness: Accuracy of Bedside Assessment Techniques.

OBJECTIVE: To evaluate the accuracy of estimated fat mass and fat-free mass from bedside methods compared with reference methods in children with chronic illnesses. STUDY DESIGN: Fat mass and fat-free mass values were obtained by skinfold, bioelectrical impedance analysis (BIA), dual-energy x-ray absorptiometry (DXA), and deuterium dilution method in children with spinal muscular atrophy, intestinal failure, and post hematopoietic stem cell transplantation (HSCT). Spearman's correlation and agreement analyses were performed between (1) fat mass values estimated by skinfold equations and by DXA and (2) fat-free mass values estimated by BIA equations and by DXA and deuterium dilution methods. Limits of agreement between estimating and reference methods within ±20% were deemed clinically acceptable. RESULTS: Fat mass and fat-free mass values from 90 measurements in 56 patients, 55% male, and median age of 11.6 years were analyzed. Correlation coefficients between the skinfold-estimated fat mass values and DXA were 0.93-0.94 and between BIA-estimated fat-free mass values and DXA were 0.92-0.97. Limits of agreement between estimated and DXA values of fat mass and fat-free mass were greater than ±20% for all equations. Correlation coefficients between estimated fat-free mass values and deuterium dilution method in 35 encounters were 0.87-0.91, and limits of agreement were greater than ±20%. CONCLUSION: Estimated body composition values derived from skinfold and BIA may not be reliable in children with chronic illnesses. An accurate noninvasive method to estimate body composition in this cohort is desirable.

Perfil da composição corporal de mulheres com obesidade grau III pelo método de bioimpedância multipolar / Profile of body composition in women with class III obesity by multipolar bioimpedance method / Perfil de composición corporal en mujeres con obesidad grado III por el método de bioimpedancia multipolar

RESUMO Objetivo O objetivo do estudo foi analisar um perfil da composição corporal de mulheres com obesidade grau III, através do método de bioimpedância multipolar. Métodos Foram avaliadas 13 mulheres com idades entre 20 e 40 anos e sedentárias. Resultados Os resultados demonstraram que as pacientes possuíam um % de 51,9±1,50 % e massa livre de gordura de 48,1±1,50 %. Em relação à massa gorda e massa magra por regiões do corpo, observou-se que no tronco havia 26,3±3,62 kg e 26,2±2,91 kg, seguido dos membros inferiores com 9,1±0,06 kg e 8,4±0,14 kg e dos membros superiores 3,3±0,02 kg e 7,6±0,01 kg, respectivamente. Os pacientes demonstraram certa simetria entre o lado direito e esquerdo tanto para os membros superiores e inferiores, além disto, à massa muscular foi 32,1±5,08 kg, com um índice de massa muscular de 12,7±1,05 kg/m2. Conclusão Houve um maior acumulo de gordura na região do tronco seguido de membros inferiores e superiores e a massa muscular total estava aparentemente preservada, não sendo verificada a obesidade sarcopênica. Como é um grupo de pessoas que ainda é pouco estudado há a necessidade de uma maior investigação sobre o perfil genético, físico e do gasto calórico em repouso e em exercício.(AU)

ABSTRACT Objective To analyze a body composition profile in women with class III obesity using the multipolar bioimpedance method. Methods Thirteen sedentary women aged between 20 and 40 years were evaluated. Results The results show that the patients had a fat percentage of 51.9±1.50 % and lean mass of 48.1±1.50 %. Regarding fat mass and lean mass per body region, figures of 26.3±3.62kg and 26.2±2.91kg in the upper body, 9.1±0.06kg and 8.4±0.14kg in the lower limbs, and 3.3±0.02kg and 7.6±0.01kg in the upper limbs were obtained. Patients had a good symmetry between the left and right sides in both upper and lower limbs, besides of a muscular mass of 32.1±5.08kg, with a muscular mass index of 12.7±1.05kg/m2. Conclusion Higher fat accumulation was observed in the upper body region, followed by lower and upper limbs. Total muscular mass was apparently preserved, although sarcopenic obesity was not verified. Since this is a group of people that is still understudied, there is a need for further research on genetic and physical profile and caloric expenditure during exercise and rest.

RESUMEN Objetivo Analizar un perfil de la composición corporal de mujeres con obesidad grado III, a través del método de bioim-pedancia multipolar. Métodos Se evaluaron 13 mujeres de entre 20 y 40 años y sedentarias. Resultados Los resultados demostraron que las pacientes poseían un %G de 51,9 ± 1,50 % y una masa libre de grasa de 48,1 ± 1,50 %. En cuanto a la masa grasa y masa magra por regiones del cuerpo, se observó que en el tronco había 26,3 ± 3,62 kg y 26,2 ± 2,91 kg, seguido de los miembros inferiores con 9,1 ± 0,06 kg y 8 , 4 ± 0,14 kg y de los miembros superiores 3,3 ± 0,02kg y 7,6 ± 0,01 kg, respectivamente. Los pacientes demostraron cierta simetría entre el lado derecho e izquierdo tanto para los miembros superiores e inferiores, además, a la masa muscular fue 32,1 ± 5,08 kg, con un índice de masa muscular de 12,7 ± 1,05 kg/m2. Conclusión Hubo un mayor acúmulo de grasa en la región del tronco seguido de miembros inferiores, superiores y la masa muscular total estaba aparentemente preservada, no siendo verificada la obesidad sarcopénica. Como es un grupo de personas que todavía es poco estudiado hay la necesidad de una mayor investigación sobre el perfil genético, físico y del gasto calórico en reposo y en ejercicio.(AU)

Dynamic changes in bioelectrical impedance vector analysis and phase angle in acute decompensated heart failure.

OBJECTIVES: To evaluate whether changes in hydration status (reflecting fluid retention) would be detected by bioelectrical impedance vector analysis (BIVA) and phase angle during hospitalization for acute decompensated heart failure (ADHF) and after clinical stabilization. METHODS: Patients admitted to ADHF were evaluated at admission, discharge and after clinical stabilization (3 mo after discharge) for dyspnea, weight, brain natriuretic peptide, bioelectrical impedance resistance, reactance, and phase angle. Generalized estimating equations and chi-square detected variations among the three time points of evaluation. RESULTS: Were included 57 patients: Mean age was 61 ± 13 y, 65% were male, LVEF was 25 ± 8%. During hospitalization there were improvements in clinical parameters and increase in resistance/height (from 250 ± 72 to 302 ± 59 Ohms/m, P < 0.001), reactance/height (from 24 ± 10 to 31 ± 9 Ohms/m, P < 0.001), and phase angle (from 5.3 ± 1.6 to 6 ± 1.6°, P = 0.007). From discharge to chronic stability, both clinical and BIVA parameters remained stable. At admission, 61% of patients had significant congestion by BIVA, and they lost more weight and had higher improvement in dyspnea during hospitalization (P < 0.05). At discharge, more patients were in the upper half of the graph (characterizing some degree of dehydration) while at chronic stability normal hydration status was more prevalent (P < 0.001). CONCLUSIONS: BIVA and phase angle were able to detect significant changes in hydration status during ADHF, which paralleled the clinical course of recompensation, both acutely and chronically. The classification of congestion by BIVA at admission identified patients with more pronounced changes in weight and dyspnea during compensation.

Early-pregnancy percent body fat in relation to preeclampsia risk in obese women.

OBJECTIVE: The purpose of this study was to identify differences of early-pregnancy body fat percentage and body mass index (BMI) between obese women that experienced preeclampsia and those who did not. STUDY DESIGN: We performed an analysis of the Prenatal Exposures and Preeclampsia Prevention 3 longitudinal cohort study of preeclampsia mechanisms in obese and overweight women. Women completed questionnaires regarding their health behaviors; had hematocrit level, weight and height, and waist and hip circumferences measured, and had resistance and reactance measured by bioelectric impedance analysis machine during the first, second, and third trimesters. Total body water, fat mass, and percent body fat were calculated with the use of pregnancy-specific formulas. Preeclampsia was assessed with the clinical definition and a research definition (clinical preeclampsia plus hyperuricemia). Logistic regression models were constructed to analyze early-pregnancy BMI and body fat percentage (measured at 10.2 ± 3.0 weeks of gestation) as predictors of preeclampsia outcomes. RESULTS: Three hundred seventy-three women were included in the analysis: 30 women had preeclampsia by clinical definition (8.0%), and 14 women had preeclampsia by the research definition (3.8%). There was no relationship between BMI and preeclampsia risk in obese women; however, body fat percentage was associated significantly with increased risk of both the clinical definition of preeclampsia and the research definition. In 239 obese women, a 1% increase in body fat was associated with approximately 12% increased odds of clinical preeclampsia and 24% increased risk of preeclampsia by the research definition. CONCLUSION: Early-pregnancy body fat appears to be important in the pathophysiologic condition of preeclampsia in obese women.

Gordura corporal de pacientes em hemodiálise / Body fat of hemodialysis patients

Objetivo. Avaliar a gordura corpórea de pacientes em hemodiálise por bioimpedância elétrica e dobras cutâneas, a correlação entre os dois métodos e destes com o índice de massa corpórea. Métodos. Estudo transversal com 38 pacientes adultos em hemodiálise no Hospital das Clínicas da Universidade Federal de Goiás. Calculou-se o índice de massa corpórea: peso (kg)/altura (m2). Utilizaram-se bioimpedância elétrica e dobras cutâneas - triciptal, biciptal, subescapular e suprailíaca - para estimar a gordura corporal. Utilizaram-se estatística descritiva, coeficiente de correlação de Pearson e teste t de Student, sendo consideradas significativas diferenças no nível de p < 0,05. Resultados. A média do índice de massa corpórea indicou eutrofia nos dois sexos. As mulheres apresentaram percentual de gordura de 35,4% pelas dobras cutâneas e 39,3% pela bioimpedância elétrica. Nos homens, o percentual de gordura pelas dobras cutâneas foi 23,1% e 26,8% pela análise de bioimpedância elétrica. A média da gordura estimada por bioimpedância elétrica e dobras cutâneas não apresentou diferença estatisticamente significante nos dois sexos, todos p > 0,05. A gordura corporal apresentou correlação positiva entre a bioimpedância elétrica e as dobras cutâneas com r = 0,81 nos homens e r = 0,96 nas mulheres. Verificou-se forte correlação entre o índice de massa corpórea e os dois métodos em ambos os sexos. Conclusão. As mulheres apresentaram excesso de gordura corporal pelos dois métodos. Apesar de os homens terem percentual de gordura ligeiramente elevado apenas pela bioimpedância elétrica, não houve diferença estatisticamente significante entre os métodos. A forte correlação entre os métodos, e destes com o índice de massa corpórea, sugere que ambos são úteis e confiáveis para a avaliação da gordura corporal e acompanhamento nutricional de pacientes em hemodiálise.

Objective. To evaluate the body fat of hemodialysis patients by electrical bioimpedance and skin folds, the correlation between the two methods and those with body mass index.Methods. Cross-sectional study with 38 adult patients on hemodialysis in the Hospital of the Federal University ofGoiás. The body mass index was calculated: weight (kg)/height (m2); electrical bioimpedance and skin folds (triciptal, biciptal, subscapular and suprailiac) were used to estimate the body fat. We used descriptive statistics, Pearson correlation coefficient (r) and Student t test, considering significant differences in the level of p < 0.05.Results. The mean body mass index for both sexes indicated normal range. Women had 35.4% fat by skin foldsand 39.3% by electrical bioimpedance. Men presented 23.1% of fat by skin folds and 26.8% by electrical bioimpedance. The average fat estimated by electrical bioimpedance and skin folds was not statistically significant among both sexes, p > 0.05. The body fat showed a positive correlation between electrical bioimpedance and skin folds, withr = 0.81 in men and r = 0.96 in women. There was strong correlation between body mass index and the two methodsamong both sexes. Conclusion. Women showed an excess of body fat by the two methods. Although men show slightly higher percentage of fat just by electrical bioimpedance, there was no statistically significant difference between the methods. The strong correlation between the methods, and those with body mass index, suggest that both are useful and reliablefor the assessment of body fat and nutritional monitoring of hemodialysis patients.