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Comparison of bioelectrical impedance with skinfold thickness and x-ray absorptiometry to measure body composition in HIV-infected with lipodistrophy

VASSIMON, H. Siqueira; JORDAO, A. A.; PAULA, F. J. Albuquerque de; MACHADO, A. Artioli; MONTEIRO, J. Pontes
Fonte: AULA MEDICA EDICIONES Publicador: AULA MEDICA EDICIONES
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
56.72%
Introduction: Human immunodeficiency virus (HIV)associated lipodystrophy syndrome (LS) includes body composition and metabolic alterations. Lack of validated criteria and tools make difficult to evaluate body composition in this group. Objective: The aim of the study was to compare different methods to evaluate body composition between Brazilians HIV subjects with (HIV+LIPO+) or without LS (HIV+LIPO-) and healthy subjects (Control). Methods: in a cross-sectional analyses, body composition was measured by bioelectrical impedance analysis (BIA), skinfold thickness (SF) and dual-energy x-ray absorptiometry (DXA) in 10 subjects from HIV+LIPO+ group; 22 subjects from HIV+LIPO- group and 12 from Control group. Results: There were no differences in age and body mass index (BMI) between groups. The fat mass (FM) (%) estimated by SF did not correlate with DXA in HIV+LIPO+ group (r = 0,46/p >0,05) and had fair agreement in both HIV groups (HIV+LIPO+ =0,35/ HIV+ LIPO- = 0,40). BIA had significant correlation in all groups (p < 0,05) and strong agreement, meanly in HIV groups, for FM (HIV+LIPO+ = 0,79/ HIV+LIPO- = 0,85/Control = 0,60) and for fat free mass (FFM) (HIV+LIPO+ = 0,93/ HIV+LIPO- = 0,92 / Control = 0,73). Discussion: Total fat mass can be measured by BIA with good precision...

Reference distribution of the bioelectrical impedance vector in healthy term newborns

MARGUTTI, Ana V. B.; MONTEIRO, Jacqueline P.; CAMELO JR., Jose S.
Fonte: CAMBRIDGE UNIV PRESS Publicador: CAMBRIDGE UNIV PRESS
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.1%
Bioelectrical impedance vector analysis (BIVA) is a new method that is used for the routine monitoring of the variation in body fluids and nutritional status with assumptions regarding body composition values. The aim of the present study was to determine bivariate tolerance intervals of the whole-body impedance vector and to describe phase angle (PA) values for healthy term newborns aged 7-28 d. This descriptive cross-sectional study was conducted on healthy term neonates born at a low-risk public maternity. General and anthropometric neonatal data and bioelectrical impedance data (800 mu A-50 kHz) were obtained. Bivariate vector analysis was conducted with the resistance-reactance (RXc) graph method. The BIVA software was used to construct the graphs. The study was conducted on 109 neonates (52.3% females) who were born at term, adequate for gestational age, exclusively breast-fed and aged 13 (SD 3.6) d. We constructed one standard, reference, RXc-score graph and RXc-tolerance ellipses (50, 75 and 95 %) that can be used with any analyser. Mean PA was 3.14 (SD 0.43)degrees (3.12 (SD 0.39)degrees for males and 3.17 (SD 0.48)degrees for females). Considering the overlapping of ellipses of males and females with the general distribution...

Bioelectrical impedance vector analysis (BIVA) in stable preterm newborns

Barban Margutti, Ana Vitoria; Bustamante, Carolina Reis; Sanches, Maisa; Padilha, Marina; Beraldo, Rebeca Antunes; Monteiro, Jacqueline Pontes; Camelo, Jose Simon, Jr.
Fonte: SOC BRASIL PEDIATRIA; RIO DE JANEIRO, RJ Publicador: SOC BRASIL PEDIATRIA; RIO DE JANEIRO, RJ
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
56.92%
Objective: To observe the behavior of the plotted vectors on the RXc (R - resistance - and Xc - reactance corrected for body height/length) graph through bioelectrical impedance analysis (BIVA) and phase angle (PA) values in stable premature infants, considering the hypothesis that preterm infants present vector behavior on BIVA suggestive of less total body water and soft tissues, compared to reference data for term infants. Methods: Cross-sectional study, including preterm neonates of both genders, in-patients admitted to an intermediate care unit at a tertiary care hospital. Data on delivery, diet and bioelectrical impedance (800 mA, 50 kHz) were collected. The graphs and vector analysis were performed with the BIVA software. Results: A total of 108 preterm infants were studied, separated according to age (< 7 days and >= 7 days). Most of the premature babies were without the normal range (above the 95% tolerance intervals) existing in literature for term newborn infants and there was a tendency to dispersion of the points in the upper right quadrant, RXc plan. The PA was 4.92 degrees (+/- 2.18) for newborns < 7 days and 4.34 degrees (+/- 2.37) for newborns >= 7 days. Conclusion: Premature infants behave similarly in terms of BIVA and most of them have less absolute body water...

Bioelectrical impedance analysis and anthropometry for the determination of body composition in rats: effects of high-fat and high-sucrose diets; Bioimpedância elétrica e antropometria na determinação da composição corporal de ratos: efeitos das dietas ricas em lipídeos e sacarose

Angéloco, Larissa Rodrigues Neto; Deminice, Rafael; Leme, Izabel de Arruda; Lataro, Renata Cristina; Jordao Junior, Alceu Afonso
Fonte: PONTIFICIA UNIVERSIDADE CATOLICA CAMPINAS; CAMPINAS Publicador: PONTIFICIA UNIVERSIDADE CATOLICA CAMPINAS; CAMPINAS
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.19%
Objective The aim of the present study was to determine the impedance of Wistar rats treated with high-fat and high-sucrose diets and correlate their biochemical and anthropometric parameters with chemical analysis of the carcass. Methods Twenty-four male Wistar rats were fed a standard (AIN-93), high-fat (50% fat) or high-sucrose (59% of sucrose) diet for 4 weeks. Abdominal and thoracic circumference and body length were measured. Bioelectrical impedance analysis was used to determine resistance and reactance. Final body composition was determined by chemical analysis. Results Higher fat intake led to a high percentage of liver fat and cholesterol and low total body water in the High-Fat group, but these changes in the biochemical profile were not reflected by the anthropometric measurements or bioelectrical impedance analysis variables. Anthropometric and bioelectrical impedance analysis changes were not observed in the High-Sucrose group. However, a positive association was found between body fat and three anthropometric variables: body mass index, Lee index and abdominal circumference. Conclusion Bioelectrical impedance analysis did not prove to be sensitive for detecting changes in body composition, but body mass index, Lee index and abdominal circumference can be used for estimating the body composition of rats.; OBJETIVO: Determinar a impedância de ratos tratados com dietas ricas em lipídeos e sacarose por meio do método da bioimpedância elétrica e correlacionar com a análise direta da carcaça...

Bioelectrical impedance with different equations versus deuterium oxide dilution method for the inference of body composition in healthy older persons

Pfrimer, K.; Moriguti, J. C.; Lima, N. K. C.; Marchini, J. S.; Ferriolli, E.
Fonte: SPRINGER FRANCE; PARIS Publicador: SPRINGER FRANCE; PARIS
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
67.22%
There is no consensus regarding the accuracy of bioimpedance for the determination of body composition in older persons. This study aimed to compare the assessment of lean body mass of healthy older volunteers obtained by the deuterium dilution method (reference) with those obtained by two frequently used bioelectrical impedance formulas and one formula specifically developed for a Latin-American population. A cross-sectional study. Twenty one volunteers were studied, 12 women, with mean age 72 +/- 6.7 years. Urban community, Ribeiro Preto, Brazil. Fat free mass was determined, simultaneously, by the deuterium dilution method and bioelectrical impedance; results were compared. In bioelectrical impedance, body composition was calculated by the formulas of Deuremberg, Lukaski and Bolonchuck and Valencia et al. Lean body mass of the studied volunteers, as determined by bioelectrical impedance was 37.8 +/- 9.2 kg by the application of the Lukaski e Bolonchuk formula, 37.4 +/- 9.3 kg (Deuremberg) and 43.2 +/- 8.9 kg (Valencia et. al.). The results were significantly correlated to those obtained by the deuterium dilution method (41.6 +/- 9.3 Kg), with r=0.963, 0.932 and 0.971, respectively. Lean body mass obtained by the Valencia formula was the most accurate. In this study...

Desenvolvimento de equações preditivas de composição corporal para obesos graves: uso da bioimpedância elétrica; Development of body composition prediction equations for severely obese patients: the use of bioelectrical impedance

Horie, Lilian Mika
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/09/2008 Português
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66.96%
INTRODUÇÃO: A obesidade grave dificulta fisicamente a avaliação da composição corporal. OBJETIVO: Desenvolver equações para estimativa de gordura corporal (GC) em obesos grau III. MÉTODOS: Adultos obesos graves tiveram a GC estimada por bioimpedância elétrica (BIA impedância de 5, 50, 100 e 200kHz) e por método de referência (pletismografia de deslocamento aéreo - PDA). Avaliaram-se os limites de concordância e seu coeficiente de correlação (CCC). Novas equações preditivas foram desenvolvidas por análise de regressão multivariada. RESULTADOS: A GC estimada por BIA e PDA foi similar para a população estudada (64,8 ± 15kg vs 65,6 ± 16kg, p>0,05). Ambas tiveram boa acurácia, precisão e CCC, porém a sua comparação teve amplos limites de concordância que variaram de -10,4 a 8,8kg. A equação residente de BIA aplicada em mulheres superestimou a GC (-1,3 kg; p<0,05) e em homens subestimou a GC (5,6 kg; p<0,05). Novas equações preditivas de GC foram criadas, para BIA de freqüência de 50kHz, Horie-Waitzberg & Barbosa-Silva1: GC1 (kg) = 23,25 + (0,13 × idade) + (1,00 × peso atual) + (0,09 × Resistência 50kHz) (0,80 × altura) e para BIA de frequência de 100kHz, Horie-Waitzberg & Barbosa-Silva2: GC2 (kg) = 23...

Validação de Índice de Massa Corporal (IMC) ajustado pela massa gorda obtido por impedância bioelétrica; Validation of body mass index (BMI) adjusted for fat mass using the bioelectrical impedance analysis.

Grecco, Mirele Savegnago Mialich
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 22/06/2012 Português
Relevância na Pesquisa
67%
A obesidade é definida como o excesso de tecido adiposo e o IMC tem sido um dos métodos mais utilizados para o diagnóstico de obesidade devido sua facilidade de aplicação e baixo custo. Entretanto, este índice possui a grande limitação de não diferenciar tecido adiposo e massa livre de gordura. Este trabalho buscou validar o Índice de Massa Corporal ajustado pela massa gorda obtido por impedância bioelétrica previamente desenvolvido por Mialich et al., 2011. Foi realizado um estudo transversal com 501 indivíduos, de ambos os gêneros, com faixa etária entre 17 e 38 anos, matriculados em cursos de graduação da USP do campus de Ribeirão Preto. Os indivíduos foram submetidos à aferição de peso, estatura e a avaliação de composição corporal através do equipamento de impedância bioelétrica. Além disso, foram coletadas informações referentes ao padrão alimentar por meio da aplicação de um questionário desenvolvido pelos pesquisadores, e também referente à prática de atividade física através da utilização do questionário IPAQ. A participação dos alunos foi voluntária e todos os indivíduos foram avaliados somente 1 vez no estudo e por um grupo de examinadores treinados. Para validação foi utilizado o modelo de regressão linear...

Is chronic hypoxemia in patients with chronic obstructive pulmonary disease associated with more marked nutritional deficiency?: A study of the fat-free mass evaluated by anthropometry and bioelectrical impedance methods

Godoy, I.; Castro, M. H.; Silva, E.; Togashi, R. H.; Geraldo, R. R C; Campana, A. O.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 102-108
Português
Relevância na Pesquisa
66.96%
In order to determine wheter blood gases abnormalities, specially hypoxemia, are associated with more marked changes in fat-free mass in patients with chronic obstructive pulmonary disease (CPOD), nutritional assessment was performed on 16 normoxemic (PaO 2 > 55 mm Hg) and 16 hypoxemic (PaO 2 < 55 mm Hg) COPD patients in stable clinical condition. Body weight was expressed as percentage of the ideal body weight. Fat-free mass was estimated by anthropometry (FFM-Anthr) and by bioelectrical impedance (FFM- BI). Handgrip-strength was assessed as a measure of peripheral skeletal muscle strength. Patients were age-matched and presented similar degree of airway obstruction. Malnutrition, defined as body weight less than 90% of the ideal, was observed in 19% of the normoxemic patients and in 25% of the hypoxemic patients (p>0,05). FFM values in hypoxemic patients, estimated by both methods, were not different from those observed in normoxemic patients. No significant difference was observed on handgrip values between the two groups. No correlation was found between nutritional indices and pulmonary function and gases exchange parameters. FFM correlated positively with values of peripheral muscle function in normoxemic and hypoxemic patients. These data add further evidence to the hypothesis that hypoxemia is not a primary cause of the nutritional deficiency observed in COPD patients.

Associations between bioelectrical impedance parameters and cardiovascular events in chronic dialysis patients

de Araujo Antunes, Aline; Vannini, Francieli Delatim; de Arruda Silveira, Liciana Vaz; Barretti, Pasqual; Martin, Luis Cuadrado; Caramori, Jacqueline Costa Teixeira
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 1-7
Português
Relevância na Pesquisa
67.17%
Purpose: Malnutrition and fluid overload contribute to the poor cardiovascular prognosis of dialysis patients. Since bioelectrical impedance analysis is an option for the evaluation of body composition and for the monitoring of hydration state, it may assist in the identification of subjects at high cardiovascular risk. The objective of this study was to evaluate the association between bioelectrical impedance parameters and cardiovascular events. Methods: The association between bioelectrical impedance parameters and fatal and non-fatal cardiovascular outcome was evaluated in 145 dialysis patients. Results: The mean age of the population studied was 54.9 ± 15.4 years, 49.7 % were males, and 35.9 % had diabetes. Forty (27.6 %) patients developed cardiovascular events during the 16 months (8; 32) of follow-up. Comparison of patients with and without cardiovascular events revealed higher extracellular mass/body cell mass (ECM/BCM) and extracellular water/total body water ratios and higher C-reactive protein levels in the former. Survival analysis showed that an ECM/BCM ratio >1.2 and a phase angle <6° were associated with poor cardiovascular prognosis. Among nondiabetic patients, these parameters and capacitance were independently associated with cardiovascular events...

Validation of bioelectrical impedance for the prediction of fat-free mass in brazilian elderly subjects

Rech,Cassiano Ricardo; Cordeiro,Braian Alves; Petroski,Edio Luiz; Vasconcelos,Francisco A. G.
Fonte: Sociedade Brasileira de Endocrinologia e Metabologia Publicador: Sociedade Brasileira de Endocrinologia e Metabologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2008 Português
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56.96%
Aging involves both nutritional and physiological changes, reducing fat-free mass (FFM) and increasing body fat, both of which are associated with physical weakness, unfitness and morbidity among the elderly. This study was undertaken to analyze the cross-validity of bioelectrical impedance equations for the prediction of fat-free mass (FFM) in elderly Brazilians. A cross-sectional population-based study, was performed in Florianópolis, Santa Catarina, Brazil, 2006. The study sample comprised 60 men and 120 women, aged 60 to 81. The dual energy X-ray absorptiometry (DEXA) served as gold standard. Predicted %BF and FFM were obtained from various anthropometric equations and bioelectric impedance. The cross-validation criteria suggested by Lohman and Bland-Altman plots of differences against the mean were used. The body mass index of the sample ranged from 18.4 to 39.3 kg/m². Mean percent body fat was 23.1 ± 5.8% in men and 37.3 ± 6.9% in women (range: 6 to 51.4%). In men, the equations of Kyle et al. (2001), Dey et al. (2003) and Sun et al. (2003) did not differ significantly from the DEXA measurement, with a constant error (CE) of 0.7 to 2.5 kg. In contrast, among women only the equations of Kyle et al. (2001) and Dey et al. (2003) were found to be valid (CE: 0.3 to 2.7 kg). The bioelectrical impedance equations validated in this study can be used in the Brazilian elderly population.

Bioelectrical impedance spectroscopy for the assessment of body fluid volumes of term neonates

Ferreira,D.M.; Souza,M.N.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2004 Português
Relevância na Pesquisa
67.13%
The assessment of fluid volume in neonates by a noninvasive, inexpensive, and fast method can contribute significantly to increase the quality of neonatal care. The objective of the present study was to calibrate an acquisition system and software to estimate the bioelectrical impedance parameters obtained by a method of bioelectrical impedance spectroscopy based on step response and to develop specific equations for the neonatal population to determine body fluid compartments. Bioelectric impedance measurements were performed by a laboratory homemade instrument. The volumes were estimated in a clinical study on 30 full-term neonates at four different times during the first month of life. During the first 24 hours of life the total body water, extracellular water and intracellular water were 2.09 ± 0.25, 1.20 ± 0.19, and 0.90 ± 0.25 liters, respectively. By the 48th hour they were 1.87 ± 0.27, 1.08 ± 0.17, and 0.79 ± 0.21 liters, respectively. On the 10th day they were 2.02 ± 0.25, 1.29 ± 0.21, and 0.72 ± 0.14 liters, respectively, and after 1 month they were 2.34 ± 0.27, 1.62 ± 0.20, and 0.72 ± 0.13 liters, respectively. The behavior of the estimated volume was correlated with neonatal body weight changes, leading to a better interpretation of such changes. In conclusion...

Body composition measures of obese adolescents by the deuterium oxide dilution method and by bioelectrical impedance

Resende,C.M.M.; Camelo Júnior,J.S.; Vieira,M.N.C.M.; Ferriolli,E.; Pfrimer,K.; Perdoná,G.S.C.; Monteiro,J.P.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2011 Português
Relevância na Pesquisa
66.86%
The objectives of the present study were to describe and compare the body composition variables determined by bioelectrical impedance (BIA) and the deuterium dilution method (DDM), to identify possible correlations and agreement between the two methods, and to construct a linear regression model including anthropometric measures. Obese adolescents were evaluated by anthropometric measures, and body composition was assessed by BIA and DDM. Forty obese adolescents were included in the study. Comparison of the mean values for the following variables: fat body mass (FM; kg), fat-free mass (FFM; kg), and total body water (TBW; %) determined by DDM and by BIA revealed significant differences. BIA overestimated FFM and TBW and underestimated FM. When compared with data provided by DDM, the BIA data presented a significant correlation with FFM (r = 0.89; P < 0.001), FM (r = 0.93; P < 0.001) and TBW (r = 0.62; P < 0.001). The Bland-Altman plot showed no agreement for FFM, FM or TBW between data provided by BIA and DDM. The linear regression models proposed in our study with respect to FFM, FM, and TBW were well adjusted. FFM obtained by DDM = 0.842 x FFM obtained by BIA. FM obtained by DDM = 0.855 x FM obtained by BIA + 0.152 x weight (kg). TBW obtained by DDM = 0.813 x TBW obtained by BIA. The body composition results of obese adolescents determined by DDM can be predicted by using the measures provided by BIA through a regression equation.

Bioelectrical impedance analysis and anthropometry for the determination of body composition in rats: effects of high-fat and high-sucrose diets

Neto Angéloco,Larissa Rodrigues; Deminice,Rafael; Leme,Izabel de Arruda; Lataro,Renata Cristina; Jordão,Alceu Afonso
Fonte: Pontifícia Universidade Católica de Campinas Publicador: Pontifícia Universidade Católica de Campinas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2012 Português
Relevância na Pesquisa
67.19%
OBJECTIVE: The aim of the present study was to determine the impedance of Wistar rats treated with high-fat and high-sucrose diets and correlate their biochemical and anthropometric parameters with chemical analysis of the carcass. METHODS: Twenty-four male Wistar rats were fed a standard (AIN-93), high-fat (50% fat) or high-sucrose (59% of sucrose) diet for 4 weeks. Abdominal and thoracic circumference and body length were measured. Bioelectrical impedance analysis was used to determine resistance and reactance. Final body composition was determined by chemical analysis. RESULTS: Higher fat intake led to a high percentage of liver fat and cholesterol and low total body water in the High-Fat group, but these changes in the biochemical profile were not reflected by the anthropometric measurements or bioelectrical impedance analysis variables. Anthropometric and bioelectrical impedance analysis changes were not observed in the High-Sucrose group. However, a positive association was found between body fat and three anthropometric variables: body mass index, Lee index and abdominal circumference. CONCLUSION: Bioelectrical impedance analysis did not prove to be sensitive for detecting changes in body composition, but body mass index, Lee index and abdominal circumference can be used for estimating the body composition of rats.

Prediction of body water compartments in preterm infants by bioelectrical impedance spectroscopy

Collins, C.; Reid, J.; Makrides, M.; Lingwood, B.; McPhee, A.; Morris, S.; Gibson, R.; Ward, L.
Fonte: Nature Publishing Group Publicador: Nature Publishing Group
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
Relevância na Pesquisa
56.92%
BACKGROUND/OBJECTIVES: To evaluate nutritional interventions in preterm infants, a simple, accurate assessment of the type of growth, that is, change in body composition through the relative contributions of lean body tissue and fat mass to weight gain, is needed. Bioelectrical impedance may provide such a method. The aim of this study was to develop resistivity coefficients appropriate for use in bioelectrical impedance spectroscopy (BIS) analysis of body water volumes in preterm infants. SUBJECTS/METHODS: A total of 99 preterm infants were enrolled (mean gestational age 32 completed weeks). Total body water (TBW) and extracellular water (ECW) were determined using the reference methods of deuterium and bromide dilution. BIS measurements taken at the same time allowed calculation of resistivity coefficients. Predictions of TBW and ECW obtained using these coefficients were then validated against volumes determined using the reference methods in a separate cohort of infants. RESULTS: Data were available for 91 preterm infants. BIS-predicted TBW and ECW correlated well with the measured volumes (Pearson’s rp=0.825 and 0.75, respectively). There was a small bias (TBW 10 ml and ECW 40 ml) but large limits of agreement (TBW±650 ml and ECW ±360 ml). CONCLUSIONS: BIS appears to have limited clinical utility; however...

Validação de equações antropométricas e de impedância bioelétrica para a estimativa da composição corporal em idosos; Validation of equations using anthropometric and bioelectrical impedance for estimating body composition of the elderly

Rech, Cassiano Ricardo; UFSC
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; "Artigo Não Avaliado por Pares"; Descritiva Formato: application/pdf; application/pdf
Publicado em 02/10/2006 Português
Relevância na Pesquisa
66.86%
Evidências apontam que são poucas as informações sobre métodos válidos para a estimativa da composição corporal em idosos no Brasil. Desse modo, o objetivo deste estudo foi analisar a validade cruzada de equações antropométricas e de impedância bioelétrica (IB) para a estimativa da gordura corporal (%G) e da massa livre de gordura (MLG) em idosos. Fizeram parte da amostra 60 homens e 120 mulheres, com idade entre 60 e 81 anos. A medida-critério adotada foi a Absortometria de Radiológica de Dupla Energia (DEXA), por meio de obtida por meio de um “scan” de corpo inteiro, utilizando um aparelho LUNAR PRODIGY DF+ 14319 Radiation (Madison, WI), com um software versão 7.52.002 DPX-L. Foram mensuradas as variáveis antropométricas (massa corporal, estatura, perímetros corporais e espessura de dobras cutâneas), de IB (reactância e resistência). Para análise da IB, foi utilizado um analisador Tetrapolar Biodinamics (Modelo-BF310). Analisou-se a validade cruzada de 20 equações antropométricas e 8 equações de IB. Para as equações que estimam a densidade corporal, utilizaram-se a equação de Siri (1961) e a equação adaptada por Deurenberg et al., (1989) para conversão em %G. As análises foram realizadas no pacote estatístico SPSS versão 11.5 (p; The increase of the elderly population has enhanced the need for studying aging-related issues. In this context...

Impedância bioelétrica bipolar: falta acuracidade para estimar a gordura relativa em homens. DOI: 10.5007/1980-0037.2011v13n2p100; Bipolar bioelectrical impedance: lack of accuracy in estimating relative body fat in men. DOI: 10.5007/1980-0037.2011v13n2p100

Rech, Cassiano Ricardo; Universidade Estadual de Ponta Grossa. Ponta Grossa, PR.; Glaner, Maria Fatima; Universidade Estadual de Londrina. Departamento de Educação Física. Londrina. PR
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; "Avaliado por Pares",; Comparative method; Avaliado por Pares; Descritivo Formato: application/pdf; application/pdf
Publicado em 15/02/2011 Português
Relevância na Pesquisa
66.86%
O objetivo deste estudo foi verificar a acuracidade da IB Bipolar (Omron BF 300) para a estimativa da gordura corporal relativa (G%), comparada com a absortometria de raio X de dupla energia (DXA). A G% foi mensurada em 66 homens (18-33 anos), com massa corporal média de 73,7 ± 8,4 kg; estatura 175,1 ± 6,5 cm; índice de massa corporal 23,9 ± 2,2kg/m2; G% IB 15,1 ± 4,4% e G% DXA 17,7 ± 5,1%. A acuracidade foi verificada por teste t pareado, correlação, erro padrão de estimativa (EPE) e análise de resíduos. A IB subestimou significativamente (p <0,05) os valores de G% e a correlação entre os métodos foi moderada (r= 0,769). A análise dos resíduos demonstrou que não houve concordância, sendo o erro médio de -2,6% (IC95%: -9,1;3,9). Observou-se que 42% da amostra apresentaram EPE acima do recomendado (>3,5 G%). Nos indivíduos com maior acúmulo de gordura (G% >20) a IB modelo Omron BF produziu maiores vieses na estimativa da G%. este modelo de IB não apresentou concordância com a medida da DXA para estimar a G% em homens adultos, sendo o erro maior em sujeitos com maior acúmulo de gordura.; Bioelectrical impedance (BI) is commonly used to estimate body composition in different populations. The aim of this study was to determine the accuracy of bipolar BI (Omron BF 300) in estimating relative body fat (%F) by comparing it with dual-energy X-ray absorptiometry (DEXA). %F was measured in 66 men (18 to 33 years) with a mean body weight of 73.7 ± 8.4 kg...

Body composition by underwater weighing and bioelectrical impedance methods in college students; Composição corporal através dos métodos da pesagem hidrostática e impedância bioelétrica em universitários

Carvalho, Anatole Barreto R. de; EMAF - Empresa de Aptidão Física, Recife, PE; Pires-Neto, Cândido Simões; Coordenador da Área de Cineantropometria do Centro de Educação Física e Desp
Fonte: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil Publicador: Universidade Federal de Santa Catarina. Florianópolis, SC. Brasil
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; "Avaliado por Pares",; Avaliado por Pares Formato: application/pdf; application/pdf
Publicado em 01/01/1999 Português
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56.86%
The objective of this study was to determine and to compare % fat, LBM and FM of male and female college students measured by hydrostatic weighing and bioelectrical impedance assessment (BIA). To this end, 115 subjects (57 male and 58 female), aged 18 to 30, were assessed by BIA and hydrostatic weighing, which was adopted as the gold standard. The t test for dependent samples revealed that there was a statistically signifi cant difference (p < 0,001) between mean body composition results from the two methods, despite the fact that Pearson’s correlation coeffi cients for %F, FM and LBM were signifi cant (p < 0,001). We conclude that, when interpreting the results of BIA used as a method for estimating body composition, extreme caution is necessary.; O objetivo desse estudo foi determinar e comparar o percentual de gordura, massa corporal magra (MCM) e massa gorda (MG) obtidos pelos métodos da pesagem hidrostática e impedância bioelétrica em universitários dos sexos masculino e feminino. Para tanto, foram avaliados 115 sujeitos (57 homens e 58 mulheres) entre 18 e 30 anos de idade através da impedância bioelétrica (IB) e pesagem hidrostática (PH), que foi o método adotado como critério. O teste t para amostras dependentes revelou que houve diferença estatística significante...

Body fat assessment by bioelectrical impedance and its correlation with anthropometric indicators

Diniz Araújo,M.ª L.; Coelho Cabral,P.; Kruze Grande de Arruda,I.; Siqueira Tavares Falcão,A. P.; Silva Diniz,A.
Fonte: Nutrición Hospitalaria Publicador: Nutrición Hospitalaria
Tipo: info:eu-repo/semantics/article; journal article; info:eu-repo/semantics/publishedVersion Formato: text/html; application/pdf
Publicado em 01/12/2012 Português
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67.17%
Introduction: Since the excess of body fat is associated with higher morbid-mortality rates (mainly in adults), precise, reliable, cost-effective, and broadly applicable methods are necessary for its assessment in population-based studies and in clinical practice. Objective: To evaluate the correlation between body fat estimated either by bioelectrical impedance or by the sum of skinfold thicknesses and anthropometric indicators of fat distribution. Methods: A cross-sectional study was conducted enrolled 348 undergraduate students (median 21 years), from the Federal University of Pernambuco, Northeast Brazil. Results: 262 of the subjects were women. Mean body fat assessed by bioelectrical impedance was 22.3 ± 6.2% in women and 15.2 ± 4.2% in men. Body fat obtained by the sum of skinfold thicknesses was similar to that assessed by bioelectrical impedance only in men. A strong correlation was observed between body fat assessed by bioelectrical impedance and that assessed by the sum of the skinfold thicknesses, waist circumference and waist-to-height ratio. Regarding the conicity index, there was a moderate correlation for men and a weak correlation for women. Conclusions: The sum of skinfold thicknesses surrogate of body fat percentage and can be used to assess body fat when BIA is not available in the field. Additional information about central fat distribution can be supply by measuring the waist circumference or waist-to-height ratio.

Predictive value of bioelectrical impedance analysis parameters in the mortality of patients on haemodialysis

Rodrigues,Rosária; Oliveira,Bruno; Pedroso,Sofia; Azevedo,J. Nunes; Azevedo,Pedro; Oliveira,J. P.; Silva,Fátima; Travassos,Francisco; Rodrigues,Tânia; Pereira,Orlando; Azevedo,Arlindo; Castro,Rui; Correia,Flora
Fonte: Sociedade Portuguesa de Nefrologia Publicador: Sociedade Portuguesa de Nefrologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2014 Português
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67.22%
Background: Protein-energy wasting is a very common complication in hemodialysis patients and influences their survival. All hemodialysis patients should have their nutritional status evaluated regularly using multiple methods. The bioelectrical impedance analysis has been widely used in the nutritional assessment. The objective of this study was to evaluate, for a period of 7 years, to the prognostic value of the parameters of bioelectrical impedance analysis on mortality in hemodialysis patients. Methods: A retrospective, observational study, including 301 patients in hemodialysis at baseline. During the study period 96 patients died, 46 patients were transplanted, 21 were not followed by Nutritionist, 49 were transferred to another clinic and 4 underwent treatment changes. The parameters assessed at baseline were: demographic and clinic data (age, gender, etiology of chronic kidney disease and co-morbidity), dialysis data (type and duration of hemodialysis, dialysis vintage, vascular access and Kt/V), biochemical parameters, body mass index, bioelectrical impedance analysis, subjective global assessment and PNAn. Results: According to Kaplan-Meier, Mantel-Hansel and Cox regression analysis the following variables were predictors of mortality: age...

Bioelectrical impedance values among indigenous children and adolescents in Rio Grande do Sul, Brazil

Barufaldi,Laura Augusta; Conde,Wolney Lisboa; Schuch,Ilaine; Duncan,Bruce Bartholow; Castro,Teresa Gontijo de
Fonte: Organización Panamericana de la Salud Publicador: Organización Panamericana de la Salud
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2011 Português
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57.06%
OBJECTIVE: To describe the nutritional status of indigenous children and adolescents in Rio Grande do Sul, Brazil, through bioelectrical values, and to compare the nutritional classifications of the anthropometric method to those of the body composition method. METHODS: A cross-sectional survey was conducted of 3 204 subjects at 35 schools in the 12 Kaingang indigenous lands of Rio Grande do Sul, Brazil. Following World Health Organization recommendations, the weight and height (H) of each subject was measured twice and the body mass index/age (BMI/A) was classified. Body composition was assessed by Bioelectrical Impedance Vector Analysis (BIVA). Resistance (R) and reactance (Xc) were estimated using a bioelectrical impedance analyzer. Divergences between these two methods were performed on RXc graph. RESULTS: Of the sample, 56.8% were adolescents and 50.6% were males. The mean values of phase angle were higher in adolescents, in males, and in individuals overweight by BMI/A. Mean values of R, Xc, R/H, and Xc/H were higher among children and among those with BMI/A < +2 z scores. Divergences in overweight classification were: male children, 94.6%; male adolescents, 77.1%; female children, 85.4%; and female adolescents, 94.8%. CONCLUSIONS: The mean values of bioelectrical measures observed among the Kaingang children and adolescent were similar to those found for different populations in other studies. For both gender and age groups...