Anthropometry and bioelectrical impedance analyis compared to dual-photon absorptiometry for the assessment of body composition of hiv-seropositive patients / Antropometría y análisis de impedancia bioeléctrica comparado con absorciometría fotónica dual para la evaluación de la composición corporal en pacientes infectados por vih

Introduction: HIV-seropositive patients have shown changes in body composition such as lipoatrophy in certain regions of the body and lipohypertrophy in others, representing characteristics of lipodystrophy syndrome. It is important to monitor the quantity of fat per body segment using practical and low-cost methods in order to optimize the treatment of this group. Objectives: To correlate the body composition per body segment obtained by anthropometric measurements and by segmental bioelectrical impedance with DXA in HIV-seropositive patients on antiretroviral treatment Methods: We measured circumferences (arm, waist, hip, thigh and calf) and skinfolds (biceps, triceps, subscapular, suprailiac) and performed segmental bioelectrical impedance (BIA) analysis and DXA. The Pearson test was used to determine correlations and the St. Laurent test was used to assess concordance between variables. Results: We evaluated 26 patients, 35% of whom were overweight. The triceps skinfold (TSF), waist circumference (WC) and thigh circumference (TC) were significantly correlated with the measurement obtained by the gold standard (p<0.01). There was no concordance between the values obtained by segmental BIA and by DXA. Conclusions: Anthropometric measurements such as TSF, WC and TC are importantfor the monitoring of changes in body composition among HIV-seropositive patients on antiretroviral treatment. Segmental BIA did not prove to be appropriate for the assessment of body composition in HIV-seropositive patients.

Introducción: Se ha descrito cambios en la composición corporal de pacientes infectados por VIH, tales como la lipoatrofia en ciertas regiones del cuerpo y lipohipertrofia en otros, en representación de las características del síndrome de lipodistrofia. Es importante controlar la cantidad de grasa corporal por segmento utilizando métodos prácticos y de bajo costo con el fin de optimizar el tratamiento de este grupo. Objetivos: correlacionar la composición corporal por segmento corporal obtenidos por las mediciones antropométricas y por impedancia bioeléctrica com DXA segmentaria en pacientes seropositivos al VIH en tratamiento antir-retroviral. Métodos: Se midieron las circunferencias de brazo, cintura, cadera, muslo y pantorrilla y los pliegues cutáneos: bíceps, tríceps, subescapular, suprailíaco) y se realizaron impedancia bioeléctrica segmentaria (BIA) el análisis y DXA. La prueba de Pearson se utilizó para determinar las correlaciones y la prueba de San Lorenzo se utilizó para evaluar la concordancia entre las variables. Resultados: Se evaluaron 26 pacientes, 35% de los cuales tenían sobrepeso. El pliegue del tríceps (PT), circunferencia de la cintura (CC) y la circunferencia del muslo (CM) se correlacionaron significativamente con la medida obtenida por el patrón de oro (p <0.01). No hubo concordancia entre los valores obtenidos por BIA y DXA segmentaria. Conclusiones: Las mediciones antropométricas como PT, CC y CM son importantes para el seguimiento de los cambios en la composición corporal de los pacientes infectados por VIH que reciben tratamiento antirretroviral. La BIA segmental no demostró ser adecuado para la evaluación de la composición corporal en pacientes infectados por VIH.

Determinación de composición corporal mediante análisis de impedancia segmentada: consideraciones y aplicaciones prácticas / Determination of body composition by segmental bioeletrical impedance analysis: considerations and practical applications

Introduction: Bioelectrical impedance is a fast, inexpensive, easy, portable, and noninvasive method. A major innovation in the analysis of body composition is segmental bioelectrical impedance. Objectives: To assess the applicability of segmental bioelectrical impedance. Subjects and methods: The study was conducted on female subjects divided into two groups: Group I (n =8) consisted of healthy women and group II (n=25) of obese women with Polycystic Ovary Syndrome (PCOS). All subjects were submitted to examination by total and segmental bioelectrical impedance. Results and discussion: Anthropometric parameters (weight, BMI, total lean mass and total fat mass) showed significant differences between groups. There was a significant difference between groups I and II for all body segments evaluated, except for lean mass of the leg. Conclusion: Procedures of segmental bioelectrical impedance will be increasingly useful in the nutritional assessment of tissue masses, enabling assessment that is more sensitive and monitoring of nutritional care.

Introdução : A impedância bioelétrica é um método rápido, barato, fácil, portátil e nao invasivo. Urna grande inovação na análise da composição corporal é a Impedância Bioelétrica Segmentar. Objetivos: Avahar a aplicabilidade da impedância bioelétrica segmentar. Sujetos e Métodos: o estudo foi realizado com individuos do sexo feminino, divididos em: Group I (n=8) composto por mulheres eutróficas e o Group II (n=25) mulheres obesas com Síndrome do Ovario Policístico (SOP). Todos os individuos foram submetidos ao exame de impedância bioelétrica total e segmentar. Resultados e discussão : Os parâmetros antropométricos de peso, IMC, massa magra total e massa gorda total apresentaram diferencas significativas entre os groups. Houve diferenca significativa para todos os segmentos corporais avahados, com exceção da massa magra da perna entre o group I e II. Conclusão : Procedimentos de impedância bioelétrica segmentar serão cada vez mais úteis na avaliação nutricional de massas teciduais, possibilitando avaliações e monitoramentos mais sensíveis do cuidado nutricional.

LIMB MUSCLE MASS DECREASE WITH AGING IN JAPANESE MEN AND WOMEN AGED 15-97 yr / 体力科学

Although skeletal muscle mass decreases with aging, its decrease rate may differ among parts of the body. There have been few studies examining the differences in the muscle mass decrease rate between proximal and distal parts of the limbs or between the left and right legs in a large population. Bioelectrical impedance (BI) index, calculated as the ratio of the square of segment length to impedance, is linearly correlated with the muscle mass calculated by MRI (r=0.902-0.976, p<0.05, Miyatani et al., 2001) in the limb segments. The purpose of this study was to examine differences in the decrease rate of muscle mass between the proximal and distal parts of the limbs and between the upper and lower limbs in healthy Japanese. The BI index was measured in the bilateral thighs, lower legs, upper arms, and forearms of 1006 healthy Japanese men and women (aged 15-97 years). While the BI index decreased with aging in all examined parts of the body, the decrease rate was larger in the lower limb than in the upper limb, and in the thigh than in the lower leg. The percentage of people who showed a difference of more than 10 % in the BI index between the left and right lower limbs was significantly higher in the elderly than in young subjects. These differences in the decrease rate of muscle mass between limbs may be associated with decreases in physical functions in the elderly.