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J. pediatr. (Rio J.) ; 97(1): 75-79, Jan.-Feb. 2021. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1154722


Abstract Objective: The aim of the present study was to evaluate the agreement between the most used skinfold thickness equations with multi-frequency bioimpedance analysis in the prediction of body fat levels in children. Method: A cross-sectional study of healthy Brazilian community-dwelling individuals. The anthropometric assessment included height, body mass, arm circumference, and waist circumference. The percentage of body fat was obtained by measuring skinfold thickness equations and using bioimpedance analysis, and skinfold thickness was measured using a scientific skinfold caliper. Bland-Altman plot analysis was used to verify the agreement between the methods. Results: There were 439 children and adolescents evaluated, with a mean age of 11.6 ± 3.7 years. The mean body fat by bioimpedance analysis was 22.8% ± 10.4%, compared to 22.4% ± 8.8% by Slaughter (1), 20.4% ± 9.2% by Slaughter (2), 19.6% ± 4.4% by Goran, and 24.7% ± 10.0% by Huang equations. Bland-Altman plot analysis revealed limits of agreement greater than 8% between the bioimpedance analysis approach and equations, exceeding the clinically acceptable limit predefined a priori. None of the equations had good agreement with bioimpedance analysis. Conclusion: It was concluded that skinfold thickness and bioimpedance analysis should not be used interchangeably in children and adolescents.

Int. j. morphol ; 38(1): 120-125, Feb. 2020. tab, graf
Article in Spanish | LILACS | ID: biblio-1056408


En el mundo la obesidad es considerada una pandemia que provoca grandes cambios metabólicos, responsables de las llamadas enfermedades crónicas no transmisibles (ECNT), las cuales presentan un 60 % de mortalidad, según la Organización Mundial de la Salud (2016). En Chile el 75 % de la población adulta y el 50,9 % de la población estudiantil, muestran índices de masa corporal de sobrepeso y obesidad, con un nivel de sedentarismo general de 66,2 %. Los objetivos de este trabajo fueron determinar los perfiles antropométricos, riesgo metabólico y niveles de actividad física en profesores de enseñanza básica en un colegio particular subvencionado de Arica-Chile. El total de los profesores, 12 varones y 29 mujeres, fueron evaluados según: peso, talla, perímetro de cintura, índice cintura-talla (ICT), índice de masa corporal (IMC), masa grasa (MG), masa grasa visceral (MGV) y masa muscular (MM). A todos ellos se les calculó el riesgo metabólico según protocolos de Ashwell & Gibson (2016) y el IMC según fórmula de Quetelet. Para determinar los porcentajes de MG, MM y MGV, se utilizó instrumento de bioimpedancia eléctrica, Omron HBF-514C. Posteriormente se les aplicó una encuesta sobre nivel de actividad física (IPAQ). Los datos fueron analizados en estadístico IBM SPSS para tendencia central, dispersión, conteos y porcentajes. Para correlación se usó test de Pearson (r>0,5). Los resultados muestran que un 68,3 % de los profesores presenta sobrepeso y obesidad. El IMC y porcentaje de MGV son significativamente más alto en varones que en mujeres (30,6 ±7,0 / 26,9±4,6 y 11,2±5,6 / 7,6±2,5 respectivamente). El riesgo metabólico general de la población en estudio fue de 58,5 % (75 % y 51,7 % varones y mujeres respectivamente). Se observa una alta correlación entre IMC-MGV (0,84), IMC-ICT (0,84) y MM-MG (0,85). Respecto al nivel de actividad física, solo el 19,5 % de los profesores muestra un nivel de actividad física alto. Se concluye que los profesores presentan valores antropométricos alterados que indican altos índices de riesgos metabólicos y con bajos niveles de actividad física. Independientemente, las mujeres presentan mejores índices morfométricos en todos los parámetros en estudio respecto a los profesores varones. Existe una alta correlación (r) entre el índice de masa corporal y los porcentajes de masa de grasa visceral y el índice de de cintura talla. Se sugiere enfocar las intervenciones educativas según sello de vida saludable, incentivando la actividad física y mejorar los hábitos alimenticios en los profesores.

Obesity is considered a global pandemic that causes major metabolic changes. It is responsible for the so-called noncommunicable chronic diseases (NCDs), which report a 60 % mortality rate (WHO, 2017). In Chile, 63 % of the population shows body mass indexes (BMI) of overweight and obesity, with a sedentary level of 86.7 %. The objectives of this work were to determine the anthropometric profiles, metabolic risk, and physical activity levels in primary school teachers, in a subsidized school in Arica, Chile. The teachers (n=41), 12 men, and 29 women were evaluated according to weight, height, waist circumference (WC), waist-to-height index (WHI), BMI, Fat Mass (FM), Visceral Fat Mass (VFM) and Muscle Mass (MM). All of them were calculated for metabolic risk, according to Ashwell & Gibson protocols and BMI according to Quetelet's formula. To determine the percentages of FM, MM, and VFM, an electric bioimpedance instrument, Omron HBF-514C, was used. Subsequently, a survey of physical activity level (IPAQ) was applied. The data were analyzed in the IBM SPSS statistic for central tendency, dispersion, counts, and percentages. For correlation, Pearson's test (r> 0.5) was used. The results show that 68.3 % of teachers are overweight and obese. BMI and percentage of VFM are significantly higher in men than in women (30.6 ± 7.0 / 26.9 ± 4.6 and 11.2 ± 5.6 / 7.6 ± 2.5 respectively). The overall metabolic risk of the study population was 58.5 % (75 % and 51.7 % men and women, respectively). There is a high correlation between BMIVFM (0.84), BMI-WHI (0.84), MM-FM (0.85). Regarding the level of physical activity, only 19.5 % of teachers show a high level of physical activity. It is concluded that teachers have altered anthropometric values that indicate high rates of metabolic risks and low levels of physical activity. Regardless, women have better morphometric indexes in all parameters under study, compared to male teachers. There is a high correlation (r) between body mass index and percentages of visceral fat mass and waist height index. It is suggested to focus on educational interventions according to the healthy life seal, promoting physical activity, and improving eating habits in teachers.

Humans , Male , Female , Adult , Body Composition , Risk Assessment , School Teachers , Metabolic Diseases/diagnosis , Body Mass Index , Chile , Adipose Tissue , Waist-Height Ratio
Int. j. morphol ; 37(4): 1286-1293, Dec. 2019. tab, graf
Article in English | LILACS | ID: biblio-1040126


Profile and standards for the diagnostics of percent of body fat and muscles were defined on a sample of 1924 women from the Republic of Serbia, aged 18.0 to 69.9, where the body structure of subjects was measured by applying multichannel segmental bioimpedance. Total sample was divided into six age groups, for the purpose of the definition of standard with regards to age. When it comes to body fat percentage results have shown that the average value of the total sample was 28.51±9.26 %, and between the range of 23.81 and 39.94 % for age groups 18.0-19.9 yr and 60.0-69.9 yr, respectively. Regression analysis results have shown that the constant of body fat percentage increase by trend of 3.417 % per decade, and that 25.1 % of mutual variance trend was explained by the model, with prediction error of 4.55 %. With regards to the percentage of skeletal muscles in the body, the results have shown that the average value of the total sample was 39.30±5.25 %, and within the range of 42.25 to 32.58 % for age groups 18.0-19.9 yr and 60.0-69.9 yr, respectively. Regression analysis results have shown that the constant of the skeletal muscles decrease by tend of -2.016 % per decade and that the model explained 23.8 % of mutual variance trend with prediction error of 8.08 %.

El perfil y estándares para el diagnóstico del porcentaje de grasa corporal y masa muscular fueron definidos en una muestra de 1924 mujeres de la República de Serbia, con edades comprendidas entre 18,0 y 69,9 años, donde la composición corporal de los sujetos fue medida por bioimpedancia segmentaria multicanal. La muestra fue dividida en seis grupos, con el propósito de definir los estándares respecto a la edad. Respecto al porcentaje de grasa corporal los resultados han mostrado que el valor promedio de la muestra fue de 28,51±9,26 %, y entre los rangos de 23,81 y 39,94 para los grupos de edad de 18,0-19,9 años y 60,069,9 años, respectivamente. Los resultados del análisis de regresión mostraron que la constante del porcentaje de grasa corporal aumentó 3,417 % por década, y que un 25,1 % de la varianza fue explicada por el modelo, con un error de predicción de 4,55 %. Con respecto al porcentaje de masa muscular, los resultados han mostrado que el valor promedio de la muestra fue de 39,30±5,25 %, y entre los rangos de 42,24 y 32,58 para los grupos de edad de 18,0-19,9 años y 60,0-69,9 años, respectivamente. Los resultados del análisis de regresión han mostrado que la constante de masa muscular decreció -2,016 % por década y que el modelo explicó 23,8 % de la varianza con un error de predicción de 8,08 %.

Humans , Female , Adolescent , Adult , Middle Aged , Aged , Young Adult , Body Composition , Adipose Tissue/anatomy & histology , Muscle, Skeletal/anatomy & histology , Reference Values , Cross-Sectional Studies , Surveys and Questionnaires , Regression Analysis , Analysis of Variance , Electric Impedance , Age Distribution , Serbia
Article | IMSEAR | ID: sea-203123


Objective: The main task of this work consists in an obtaining polarizable, dry mode, of bio-impedance sensors for non-invasiveECG monitoring, that work without any skin preparation or gel use, in two constructive models, based on conductive organicpolymer polypyrrole and polypyrrole with Ag nanoparticles (NP), as sensitive materials. Methods: The polypyrrole wassynthetized by chemical oxidative polymerization using FeCl3 as oxidant agent. For sensors fabrication two technological variantshave been chosen, a first variant realized by photolithographic method consisting in a substrate of Printed Circuit Board (PCB)with interdigitated copper electrode with step of 0.25 mm and over a distance of 12 mm and two pads. The polypyrrole orpolypyrrole with Ag NP dissolved in ethyl alcohol was deposed on the substrate by dipping method. The second model consists ina polypyrrole powder pressed at a hydraulic press at 10 tones/cm2 of force where one site was deposed a layer of Ag ink forconduction. Results: The performance of bio-impedance sensors were accessed by impedance skin-sensor interface withfrequency in the range of 10 - 300 kHz measurements. The influences of technological fabrication as shape and geometry as wellas the sensitive materials that used, in terms of impedance were analyzed. Conclusions: The introduction of Ag NP in polypyrrole,led to a better behavior, in terms of conduction and impedance response. For all tested sensors, the impedance decreases with thefrequency with a good linearity.

Gac. méd. Méx ; 155(3): 04, may.-jun. 2019. tab, graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1286496


Resumen Introducción: La bioimpedancia eléctrica multifrecuencia (BIE) evalúa con precisión la composición corporal. Objetivo: Investigar el estado nutricional y su relación con el índice de masa corporal (IMC) o el ángulo fase obtenido por BIE en pacientes con enfermedad renal terminal (ERT) en hemodiálisis. Método: En 99 pacientes en hemodiálisis (43.6 ± 17.2 años, 58.8 % varones) se evaluó IMC, BIE y puntuación de desnutrición (DMS, Dialysis Malnutrition Score). La independencia de las asociaciones del IMC y el ángulo fase con el DMS se determinó con regresión lineal múltiple. Resultados: El riesgo de desnutrición (DMS > 13) se incrementó gradualmente entre los sujetos con IMC y ángulo fase normales (44.4 %), IMC bajo (45.8 %), ángulo fase bajo (64.0 %) y en aquellos con ambos parámetros anormales (68.0 %). El ángulo fase fue la única variable asociada independientemente con el estado nutricional de los pacientes (coeficiente beta estandarizado −0.372, p < 0.001), lo que explicó 13.8 % de la variación en el DMS. Conclusiones: El ángulo fase se asocia inversa e independientemente con el riesgo de desnutrición en pacientes con ERT, lo que sugiere que la composición corporal evaluada por BIE pudiera ser mejor que el IMC en la valoración clínica de pacientes con esta enfermedad.

Abstract Introduction: Multi-frequency bio-impedance analysis (BIA) accurately evaluates body composition. Objective: To assess nutritional status and its relationship with body mass index (BMI) or with BIA-obtained phase angle in patients with end-stage renal disease (ESRD) on hemodialysis. Method: BMI, BIA and dialysis malnutrition score (DMS) were assessed in 99 patients on hemodialysis (43.6 ± 17.2 years of age, 58.8% males). Multivariate linear regression analysis was used to determine BMI and phase angle independent associations with DMS. Results: Malnutrition risk (DMS > 13) showed a gradual increase among patients with normal BMI and phase angle (44.4%), low BMI (45.8%), low phase angle (64.0%), and in those with both parameters at abnormal ranges (68.0%). The phase angle was the only variable that was independently associated with patient nutritional status (standardized coefficient beta −0.372, p < 0.001), accounting for 13.8% of DMS variation. Conclusion: Phase angle is inversely and independently associated with malnutrition risk in patients with ESRD, which suggests that BIA-assessed body composition might be better than BMI in the clinical assessment of patients with ESRD.

Journal of Biomedical Engineering ; (6): 1012-1017, 2019.
Article in Chinese | WPRIM | ID: wpr-781834


The injury of the knee joint is usually accompanied with the generation of hydrops. The volume of hydrops can be used as a reference to evaluate the extent of knee joint injuries. Based on the principle of bioimpedance detection, in this paper, a new method is proposed to detect knee joint hydrops. Firstly, a three-dimensional model of the knee joint was established according to the physiological and anatomical structure of the knee joint. Secondly, a knee impedance detection system was constructed based on the four-electrode theory, and the relationship between the knee impedance change and the volume of hydrops was calculated by linear regression. Finally, the model of rat knee joint hydrops was established, and the knee joint impedance was measured under different hydrops content to deduce the relationship between the fluid content and the knee joint impedance. The fluid volume in the joint was calculated by measuring the knee joint impedance, and the error rate was less than 10%. The experimental results show that the method proposed in this paper can establish the relationship between the impedance of the knee and the volume of fluid and realize the detection of the fluid volume.

Animals , Edema , Electric Impedance , Humans , Knee , Knee Injuries , Knee Joint , Rats
Article in Chinese | WPRIM | ID: wpr-774160


Bioelectrical impedance measurement technology is a non-invasive detection technology for extracting human physiological and pathological information. The analysis method of the relationship between bioimpedance and human physiological parameters is an important part of this technology. In order to calculate the internal and external liquid volume of human cells more accurately, based on the Moissl equation for calculating the internal and external fluid volume of human cells, a segmented human bioimpedance spectrum measurement model and an improved calculation method of intracellular and external fluid capacity were proposed. The measurement and calculation experiments of the intracellular and extracellular fluid volume before and after the human body's water intake were designed and compared with the Moissl calculation method. The results show that the improved calculation method can calculate the intracellular and extracellular fluid volumes more effectively, and the relative error is less than 5%, which may provide new ideas or more accurate methods for the analysis of human body components, facilitating the diagnosis and treatment of diseases.

Body Water , Electric Impedance , Extracellular Fluid , Humans , Intracellular Fluid
Acta Anatomica Sinica ; (6): 651-655, 2019.
Article in Chinese | WPRIM | ID: wpr-844616


Objective To analyze the characteristics and the differences of body composition in Yi of Sichuan, Guizhou and Yunnan. Methods Stature, body mass and body composition of 1556 Yi(male 757 case, famale 799 case) adults from Sichuan, Guizhou and Yunnan were investigated based on Anthropometric Method and the standard of Tanita company. Results The body mass index and percent body fat of Yi nationality people from Sichuan were significantly higher than that of those from Yunnan and Guizhou. The overall muscle and limb muscles of Yi nationality people from Sichuan were more developed than that of those from Sichuan and Yunnan. Yi nationality people from Sichuan, Yunnan and Guizhou all had the characters that muscle mass in right limb was higher than that in left. Conclusion Yi nationality people from Sichuan, Yunnan and Guizhou have great difference in body composition because of the diet and labour intensity.

Arch. latinoam. nutr ; 68(2): 111-121, jun. 2018. ilus, tab, graf
Article in Spanish | LILACS, LIVECS | ID: biblio-1016529


Dado que para la población Latinoamericana se cuenta con escasas ecuaciones antropométricas validadas para determinar porcentaje de masa grasa (% MG), se diseñaron ecuaciones antropométricas prácticas para calcular el % MG en adultos jóvenes. Se realizaron mediciones antropométricas por técnicas validadas, y se calculó el % MG por densitometría (BodPod) y biompedancia. Se reclutaron 284 voluntarios (18-35 años), de uno y otro sexo. Las ecuaciones se diseñaron por regresión lineal múltiple por el método de todas las regresiones posibles y se validaron por su grado de bondad de ajuste (R2), error estándar de estimación (EEE) y por validación cruzada. En hombres: % MG por densitométría R2 = 0.78, EEE = 3.64 %, p < 0.001; % MG por bioimpedancia R2 = 0.76, EEE = 2.48 %, p < 0.001. En mujeres: % MG por densitométría R2 = 0.98, EEE = 4.02%, p < 0.001; % MG por bioimpedancia R2= 0.99, EEE = 2.37 %, p < 0.001. Las ecuaciones aquí diseñadas presentan sencillez, alta validez y confiabilidad, siendo útiles en la clínica y campo deportivo(AU)

Given that in Latin America we have few validated anthropometric equations to determine percentage of fat mass (% MG), practical anthropometric equations were designed to calculate the % MG in young adults. Anthropometric measurements were made by validated techniques, and % MG was calculated by densitometry (BodPod) and bioimpedance. We recruited 284 volunteers (18-35 years), men and women. The equations were designed by multiple linear regression by the method of all possible regressions, and validated by their degree of goodness of fit (R2), standard error of estimation (SES), and cross-validation. In men: % MG by densitometry R2 = 0.78, SES = 3.64%, p <0.001; % MG by bioimpedance R2 = 0.76, SES = 2.48%, p <0.001. In women: % MG by densitometry R2 = 0.98, SES = 4.02 %, p <0.001; % MG by bioimpedance R2 = 0.99, SES = 2.37 %, p <0.001. The equations here designed have simplicity, high validity, and reliability, being useful in the clinic and sports field(AU)

Humans , Male , Female , Adolescent , Adult , Body Composition , Body Weight , Body Weights and Measures , Body Mass Index , Anthropometry , Densitometry
Article in Chinese | WPRIM | ID: wpr-695703


Objective · To assess volume status in maintenance hemodialysis (MHD) patients.Methods · Body composition analysis was performed on 128 MHD patients from Renji Hospital,Shanghai Jiao Tong University School of Medicine.The volume status was assessed based on body composition data and predialysis systolic blood pressure (preBPsys),edema grade,brain natriuretic peptide (BNP).Patients were divided into hyperhydrated group (percentage of hydration status,HS%> 15%) or normohydrated group (HS% ≤ 15%).Body composition data were compared,including lean tissue index (LTI) and fat tissue index (FTI).The blood pressure,edema grade,serum calcium,serum phosphate,intact parathyroid hormone (iPTH),hemoglobin,albumin,pre-albumin,hypersensitive C-reactive protein (hs-CRP),serum sodium,and urea clearance Kt/V were compared between two groups.Results · Sixtynine patients were normohydrated and preBPsys reached target;10 patients were overhydrated with higher preBPsys;18 patients had overhydration but preBPsys was in target range.Compared to normohydraed group,patients in hyperhydmted group had more obvious edema,higher BNP level,significantly lower LTI,serum albumin and pre-albumin levels,while serum sodium was significantly higher (P<0.05).Conclusion· Volume status of hemodialysis patients can be objectively and accurately assessed by body composition analysis using bioimpedance technique with blood pressure,edema grade and biochemical parameters.Hyperhydrated patients may have higher serum sodium level,lower serum albumin,lower hemoglobin,and less lean tissue mass concomitantly.Sodium intake control,nutrition status improvement,and anemia correction may be useful to reduce hyperhydration.

Article in English | WPRIM | ID: wpr-718614


BACKGROUND: This study compared nutritional parameters in hemodialysis (HD) subjects and controls using bioimpedance analysis (BIA) and investigated how BIA components changed before and after HD. METHODS: This cross-sectional study included 147 subjects on maintenance HD from two hospitals and 298 propensity score-matched controls from one healthcare center. BIA was performed pre- and post-HD at mid-week dialysis sessions. RESULTS: Extracellular water/total body water (ECW/TBW) and waist-hip ratio were higher in the HD patients; the other variables were higher in the control group. The cardiothoracic ratio correlated best with overhydration (r = 0.425, P < 0.01) in HD subjects. Blood pressure, hemoglobin, creatinine, and uric acid positively correlated with the lean tissue index in controls; however, most of these nutritional markers did not show significant correlations in HD subjects. Normal hydrated weight was predicted to be higher in the pre-HD than post-HD measurements. Predicted ultrafiltration (UF) volume difference based on pre- and post-HD ECW/TBW and measured UF volume difference showed a close correlation (r 2 = 0.924, P < 0.01). Remarkably, the leg phase angle increased in the post-HD period. CONCLUSION: The estimated normal hydrated weight using ECW/TBW can be a good marker for determining dry weight. HD subjects had higher ECW/TBW but most nutritional indices were inferior to those of controls. It was possible to predict UF volume differences using BIA, but the post-HD increase in leg phase angle, a nutritional marker, must be interpreted with caution.

Blood Pressure , Body Water , Creatinine , Cross-Sectional Studies , Delivery of Health Care , Dialysis , Humans , Leg , Nutrition Assessment , Nutritional Status , Renal Dialysis , Ultrafiltration , Uric Acid , Waist-Hip Ratio
Article in English | WPRIM | ID: wpr-716082


Chronic volume overload is associated with left ventricular hypertrophy and high cardiovascular mortality in patients undergoing dialysis. Therefore, estimating body fluid status is important in these patients. However, most dry-weight assessments are still performed clinically, while attempts have been made to measure the volume status and dry weight of patients undergoing dialysis using bioimpedance analysis (BIA). BIA uses the electrical properties of the human body to alternate current flow and measures resistance values to estimate body water content and composition. BIA is divided into single-frequency BIA, multi-frequency BIA, and bioimpedance spectroscopy (BIS) according to the number of frequencies used, and into whole-body and segmental BIA according to whether or not the whole body is divided into segments. Extracellular water (ECW), intracellular water, and total body water (TBW) contents can be measured with BIA. Dry weight can be estimated by measuring the volume overload of the patient through the ECW/TBW and ECW-to-body weight ratios. Other estimation methods include the normovolemia/hypervolemia slope method, a resistance-reactance (RXc) graph, overhydration measurements using a body composition monitor, and calf BIS. In this review, we will examine the principles of BIA, introduce various volume status measurement methods, and identify the optimal method for patients undergoing dialysis.

Body Composition , Body Fluids , Body Water , Dialysis , Human Body , Humans , Hypertrophy, Left Ventricular , Methods , Mortality , Spectrum Analysis , Water
Article in Chinese | WPRIM | ID: wpr-843705


Objective: To assess volume status in maintenance hemodialysis (MHD) patients. Methods: Body composition analysis was performed on 128 MHD patients from Renji Hospital, Shanghai Jiao Tong University School of Medicine. The volume status was assessed based on body composition data and predialysis systolic blood pressure (preBPsys), edema grade, brain natriuretic peptide (BNP). Patients were divided into hyperhydrated group (percentage of hydration status, HS%>15%) or normohydrated group (HS%≤15%). Body composition data were compared, including lean tissue index (LTI) and fat tissue index (FTI). The blood pressure, edema grade, serum calcium, serum phosphate, intact parathyroid hormone (iPTH), hemoglobin, albumin, pre-albumin, hypersensitive C-reactive protein (hs-CRP), serum sodium, and urea clearance Kt/V were compared between two groups. Results: Sixtynine patients were normohydrated and preBPsys reached target; 10 patients were overhydrated with higher preBPsys; 18 patients had overhydration but preBPsys was in target range. Compared to normohydraed group, patients in hyperhydrated group had more obvious edema, higher BNP level, significantly lower LTI, serum albumin and pre-albumin levels, while serum sodium was significantly higher (P<0.05). Conclusion: Volume status of hemodialysis patients can be objectively and accurately assessed by body composition analysis using bioimpedance technique with blood pressure, edema grade and biochemical parameters. Hyperhydrated patients may have higher serum sodium level, lower serum albumin, lower hemoglobin, and less lean tissue mass concomitantly. Sodium intake control, nutrition status improvement, and anemia correction may be useful to reduce hyperhydration.

Article in Chinese | WPRIM | ID: wpr-843634


Objective: To investigate the role of common clinical indicators in volume assessments of peritoneal dialysis (PD) patients. Methods: Eligible PD patients in Renji Hospital, Shanghai Jiao Tong University School of Medicine from Nov. 2016 to Nov. 2017 were enrolled. Demographic data of patients were collected and clinical parameters were measured. Hydration status index overhydration (OH) was measured by bioimpedance spectroscopy, and the association between clinical indicators and OH was analyzed. Results: A total of 200 PD patients aged 56.3±13.8 years with median PD duration of 46.6 months were enrolled in the study. Among them, 117 (58.5%) patients were males and 42 (21.0%) patients were diabetic. 141 (70.5%) patients in the present study were overhydrated (OH>1.1 L). Compared to those with normal hydration, the overhydrated patients had higher blood pressure, more obvious edema and higher brain natriuretic peptide (BNP) level (P<0.05). In the overhydrated patients, 51 (36.2%) patients had normal blood pressure, 67 (47.5%) patients had no edema and 46 (32.6%) patients had BNP less than 100 pg/mL. In the normal hydrated patients, 20 (33.9%) patients had high blood pressure, 8 (13.6%) patients had edema and 1 (1.7%) patient had BNP higher than 400 pg/mL. Systolic pressure and BNP level were both correlated with OH positively (systolic pressure r=0.361, P=0.001; BNP r=0.615, P=0.000). The patients who had more obvious edema also had higher OH (P=0.000). Conclusion: Blood pressure, edema and BNP are closely associated with the hydration status, but only one of these clinical indicators can not accurately reflect the hydration status in all PD patients. Combination of different indicators may be useful in evaluation of hydration status in PD patients.

Nutrire Rev. Soc. Bras. Aliment. Nutr ; 42: 1-6, Dec. 2017. tab, graf
Article in English | LILACS | ID: biblio-881052


BACKGROUND: Phase angle (PhA) value is a useful tool for identifying cell membrane integrity dysfunction. It is known that metabolic syndrome (MetS) increases oxidative stress and inflammation; and consequently can promote cellular damage. We hypothesized that MetS and inflammatory blood markers could be associated with lower PhA values. Therefore, the aim of this study was to identify the association of PhA values with MetS and blood markers in individuals clinically screened for a lifestyle modification program. METHODS: In a cross-sectional study, 417 selected subjects (76 men and 341 women, 53.9 ± 9.4 years old) were evaluated. Assessments included clinics, anthropometric measures, body composition by bioimpedance, and laboratory blood markers, including plasma lipids, glucose, and C-reactive protein concentrations. According to the PhA median values, subjects were classified in low (≤6.3°) and high (>6.3°) PhA groups. RESULTS: Subjects with lower PhA values were older and showed lower body mass index, waist circumference, muscle mass index, creatinine, and uric acid; and higher gamma-GT and HDL cholesterol. Neither the presence of MetS nor the presence of the increasing number of MetS components was associated with PhA values. The logistic regression analysis adjusted for age, gender, body mass index, and muscle mass index showed that higherC-reactive protein concentrations (>3.0 mg/L) increased the odds of low PhA values (OR = 1.62; CI = 1.01­2.60).CONCLUSION: Higher C-reactive protein concentrations increased the odds of low PhA independently of the presence of MetS. Additionally, contrary to our hypothesis, MetS was not associated with PhA values.

Humans , Male , Female , Adult , Middle Aged , Biomarkers/blood , C-Reactive Protein/analysis , Metabolic Syndrome , Oxidative Stress
Iatreia ; 30(3): 255-264, jul.-set. 2017. tab, graf
Article in Spanish | LILACS | ID: biblio-892661


RESUMEN Antecedentes: existe controversia sobre la exactitud de las técnicas de bioimpedancia para calcular el porcentaje de grasa corporal (%GC). Objetivo: comparar el %GC obtenido por tres técnicas de bioimpedancia con la hidrodensitometría como método de referencia. Metodología: en 31 mujeres se midió el %GC por hidrodensitometría con medición simultánea del volumen residual pulmonar, y por las técnicas de bioimpedancia manos-pies (8-electrodos), mano-pie (4-electrodos) y pie-pie (4-electrodos). Resultados: el promedio de edad fue 22,4 ± 2,8 años y el del índice de masa corporal 23,6 ± 3,3 kg/m2 . No hubo diferencias (p > 0,05) en el %GC obtenido por hidrodensitometría y por la técnica manos-pies (31,4 ± 6,6 % y 31,9 ± 5,9 %, respectivamente). Las técnicas mano-pie y pie-pie presentaron diferencias (p < 0,05) en el %GC con la hidrodensitometría de +1,4 % y -4,9 %, respectivamente. El grado de acuerdo con el método de referencia fue aceptable para las técnicas manos-pies (Bland-Altman: IC95 %: -6,6; 5,6) y mano-pie (Bland-Altman: IC95 %: -8,0; 5,2), pero inadecuado para la técnica pie-pie (Bland-Altman: IC95 %: -4,7; 14,4). Conclusiones: en mujeres jóvenes con peso corporal promedio adecuado, la técnica de bioimpedancia manos-pies determina valores del %GC más cercanos a los de la hidrodensitometría que las técnicas mano-pie y pie-pie. Asimismo, la técnica manos-pies presenta una concordancia ligeramente mayor con el método de referencia que las técnicas mano-pie y pie-pie.

SUMMARY Background: Bioimpedance measurement allows quick and safe estimation of the body composition. However, it remains controversial which bioimpedance measurement technique is more exact for calculating the fat mass percentage (%FM). Objective: To compare the %FM obtained with three bioimpedance techniques with hydrodensitometry, as a reference method. Materials and methods: In 31 women, the %FM was assessed by hydrodensitometry with simultaneous lung residual volume measurement and three bioimpedance techniques: hands-to-feet (8-electrodes), hand-to-foot (4-electrodes) and footto-foot (4-electrodes). Results: Average age and body mass index were 22.4 ± 2.8 years and 23.6 ± 3.3 kg/m2 , respectively. There were no significant differences (p > 0.05) between the %FM obtained by hydrodensitometry (31.4 ± 6.6) and hands-to-feet technique (31.9 ± 5.9). However, hand-to-foot and foot-to-foot techniques showed differences (p < 0.05) with the reference method of +1.4 % and -4.9%, respectively. There was a fair agreement between hydrodensitometry and the results obtained with hands-to-feet (Bland-Altman: IC95 %: -6.6; 5.6) and hand-to-foot (Bland-Altman: IC95 %: -8.0; 5.2) techniques. The foot-to-foot measurement showed poor agreement with the reference method (Bland-Altman: IC95 %: -4.7; 14.4). Conclusions: In this group of young women with healthy body weight, the hands-to-feet bioimpedance technique generates body composition values closer to the hydrodensitometry results as compared with the hand-to-foot and foot-to-foot techniques. Additionally, the hands-to-feet technique shows a slightly better agreement with hydrodensitometry than the hand-to-foot and foot-to-foot techniques.

RESUMO Antecedentes: existe controvérsia sobre a exatidão das técnicas de bioimpedância para calcular a porcentagem de gordura corporal (%GC). Objetivo: comparar a %GC obtida por três técnicas de bioimpedância com a hidrodensitometria ou pesagem hidrostática como método de referência. Metodologia: em 31 mulheres se mediu a %GC por hidrodensitometria com medição simultânea do volume residual pulmonar, e pelas técnicas de bioimpedância mãos-pés (8-eletrodos), mão-pé (4-eletrodos) e pé-pé (4-eletrodos). Resultados: A média de idade foi 22,4 ± 2,8 anos e o do índice de massa corporal. 23,6 ± 3,3 kg/m2 . Não houve diferenças (p > 0,05) na %GC obtido por hidrodensitometria e pela técnica mãos-pés (31,4 ± 6,6 % e 31,9 ± 5,9 %, respectivamente). As técnicas mão-pé e pé-pé apresentaram diferenças (p < 0,05) na %GC com a hidrodensitometria de +1,4 % e -4,9 %, respectivamente. O grau de acordo com o método de referência foi aceitável para as técnicas mãos-pés (Bland-Altman: IC95 %: -6,6; 5,6) e mão-pé (BlandAltman: IC95 %: -8,0; 5,2), mas inadequado para a técnica pé-pé (Bland-Altman: IC95 %: -4,7;14,4). Conclusões: em mulheres jovens com peso corporal médio adequado, a técnica de bioimpedância mãospés determina valores da %GC mais próximos aos da hidrodensitometria que as técnicas mão-pé e pé- pé. Além disso, a técnica mãos-pés apresenta uma concordância ligeiramente maior com o método de referência que as técnicas mão-pé e pé-pé.

Humans , Female , Adult , Body Composition , Body Fat Distribution , Densitometry
Medisan ; 21(6)jun. 2017. tab, graf
Article in Spanish | LILACS | ID: biblio-894616


Se realizó un estudio descriptivo y transversal de 99 pacientes con enfermedad pulmonar obstructiva crónica, atendidos en consulta de Neumología del Hospital General Docente Dr Juan Bruno Zayas Alfonso de Santiago de Cuba, del 1 al 15 de febrero de 2015, con vistas a determinar algunos compartimientos de la composición corporal, según el modelo de organización bicompartimental del cuerpo humano y el método de la bioimpedancia eléctrica. En la serie predominaron el sexo masculino y las edades de 50 a 69 años de edad, y los grados III y II, en ese orden de frecuencia, fueron los más representativos de la enfermedad. Por su parte, la desnutrición y la disfunción muscular resultaron 2 factores determinantes de la gravedad clínica y el pronóstico de la afección. De los parámetros bioeléctricos analizados, se ratificó la masa muscular esquelética como el de supervivencia y de morbilidad y mortalidad; asimismo se demostró el ángulo de fase como parámetro de la bioimpedancia, mayormente establecido para el diagnóstico y el pronóstico clínicos

A descriptive and cross-sectional study of 99 patients with chronic obstructive pulmonary disease was carried out. They were assisted in the Pneumology Service Dr Juan Bruno Zayas Alfonso Teaching General Hospital in Santiago de Cuba, from February 1st to 15th, 2015 aimed at determining some compartments of body composition, according to the pattern of bicompartment organization of the human body and the method of the electric bioimpedance. In the series there was a prevalence of the male sex aged 50 to 69, and a higher frequency of III and II degrees (in that order) of the disease. On the other hand, malnutrition and muscular dysfunction were the 2 determining factors of clinical severity and prognosis of the disorder. Of the bioelectric parameters analyzed, the skeletal muscular mass was ratified as that of survival, morbidity and mortality; also the phase angle was demonstrated as bioimpedance parameter, mostly established for the clinical diagnosis and prognosis

Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Body Composition , Electric Impedance , Pulmonary Disease, Chronic Obstructive , Somatotypes , Secondary Care , Body Mass Index , Epidemiology, Descriptive , Cross-Sectional Studies
Int. j. morphol ; 35(1): 199-207, Mar. 2017. ilus
Article in English | LILACS | ID: biblio-840955


In order to achieve high results in sports, it is necessary to provide an adequate status of an athlete in according to various factors, among which the body structure is one of greater importance. The aim of this research is to define the most discriminated indicators of body structure indexes, thanks to which a specific change of physical structure can be observed according to a branch of sport and type of combat sport. Variables in the research were: body height, body mass, body mass index, free fat mass index, fat mass index, protein mass index, skeletal muscle mass index, percent of body fat, percent of skeletal muscle mass and protein fat index. The measuring of the body composition is realized by using multichannel segmental bioimpedance with InBody 720 apparatus, applied on the total of 112 male high level senior-age athlete members of different national team's member of Republic of Serbia (62 judokas, 29 Greco-Roman style wrestlers and 21 karatekas). The discriminative analysis has shown that subsamples of the athletes statistically differ in morphology on Wilks' lambda level (0.435, p = 0.000), and that following variables have the highest discrimination compared to athlete respondents in sport function: percent of skeletal mass (0.34), percent of body fat (0.28) and protein fat index (0.26), as the first isolated factor (p = 0.000) by which is explained 86.3 %, that is body weight (0.74), skeletal muscle index (0.73), protein mass index (0.72), body mass index (0.72) and free fat mass index (0.70), as the second factor (p = 0.030) by which 13.7 % variability of measured body structure space is explained. By establishing body structure models of judokas, wrestlers and karatekas for variables examined and by using modern technological method of measuring (InBody 720, 2008) we got new information that characterize specificity of the sport, which all contribute to spreading and improving already existing knowledge in the sports sciences and sport body morphology area.

Para obtener logros deportivos de alto nivel, es necesario conseguir el estatus adecuado dependiendo de varios factores, entre los cuales destaca el factor morfológico. El objetivo de este estudio fue definir los indicadores más discriminantes de la composición corporal o índices morfológicos, por lo cual se puedan monitorear los cambios específicos en la estructura del cuerpo en relación con la rama del deporte y el tipo de deportes de combate. Las variables del estudio fueron: altura del cuerpo, masa corporal, índice de masa corporal, índice de masa grasa, índice de proteína masa, índice de masa del músculo esquelético, porcentaje de grasa corporal, porcentaje de masa del músculo esquelético y el índice grasa proteína. La medición de la composición corporal fue realizada utilizando la bioimpedancia segmentaria multicanal con Inbod café 720 sobre una muestra de 112 deportistas de sexo masculino de categoría sénior, miembros nacionales seleccionados de la República de Serbia (62 practicantes de judo, 29 practicantes de lucha grecorromana y 21 practicantes de karate). El análisis discriminativo demostó que las submuestras de los atletas en general difieren significativamente en la morfología a nivel de lambda de Wilks ­ 0.435, (p = 0.000), y que las siguientes variables tienen la mayor discriminación en relación con la prueba de los atletas en la función del deporte: porcentaje de la masa esquelética (0.34), porcentaje de grasa corporal (0,28) y el índice de grasa proteína (0.26), como el primer factor aislado (p = 0.000), lo que explica 86,3 %, respectivamente la masa corporal (0.74), el índice de músculo esquelético (0,73), el índice de proteína de masa (0,72), índice de masa corporal (0,72), e índice de masa libre de grasa (0,70), como el segundo factor (p = 0,030), lo que explica 13,7 % de las mediciones espaciales de variabilidad. Al definir los módulos morfológicos de los practicantes de judo, karate y lucha grecorromana para las variables investigadas y usando el método tecnológico de medida más nuevo (InBody 720), hemos obtenido nuevas informaciones que caracterizan las especificidades de los deportes, lo que contribuye a la ampliación y el desarrollo de los conocimientos anteriores sobre dicho asunto.

Humans , Male , Athletes , Body Composition , Martial Arts , Somatotypes , Electric Impedance
Arch. latinoam. nutr ; 67(1): 42-48, mar. 2017. tab, graf
Article in Spanish | LILACS, LIVECS | ID: biblio-1022399


Este estudio observacional transversal evaluó el estado nutricional de 120 adultos indígenas ecuatorianos Awá para determinar la correlación entre IMC y porcentaje de grasa corporal mediante bioimpedancia, y evaluar la precisión diagnóstica del IMC para la detección de exceso de grasa. La media de IMC fue de 23,81 ± 1,95 kg / m2 en hombres y 23,58 ± 1,95 kg / m2 en mujeres, y la media de porcentaje de grasa fue de 11,4 ± 5,9 en hombres y 19,97 ± 7,19 en mujeres. Se observó una correlación positiva significativa entre IMC y porcentaje de grasa en hombres (r=0,54, p<0,01) y en mujeres (r=0,72, p<0,01). También hubo una correlación positiva significativa en los grupos de 18-40 años (r=0,79, p<0,01) y 40-59 años (r=0,49, p<0,01), mientras que en mayores de 60 años, la correlación fue positiva pero no significativa (r=0,50, p=0,97). Además, hubo una correlación significativa en el grupo de adiposidad saludable (r=0,54, p<0,001), pero no se encontró significancia en los grupos de baja y alta adiposidad (r=0,07 p=0,57, r=0,38 p=0,31 respectivamente). Un IMC ≥25 kg/m2 tuvo una sensibilidad de 90%, especificidad de 75% y un área bajo la curva de 0,88 (IC del 95% 0,81 a 0,95) para detectar exceso de grasa. En conclusión, aunque el uso del IMC como predictor de exceso de grasa se justifica en esta población, es necesario establecer otros indicadores que permitan evaluar de manera más integral y compleja el estado nutricional, no solamente enfocados en los problemas de sobrepeso y obesidad(AU)

This cross-sectional study assessed the nutritional status of 120 Ecuadorian indigenous adults Awá to determine the correlation between BMI and body fat percentage estimated by bioelectrical impedance, as well as to evaluate the diagnostic accuracy of BMI to detect excess body fat percentage in this population. Mean BMI was 23.81 ± 1.95 kg / m2 in men and 23.58 ± 1.95 kg / m2 in women, and mean body fat percentage was 11.4 ± 5.9 in men and 19.97 ± 7.19 in women. A significant positive correlation was observed between BMI and body fat percentage in men (r=0.54, p<0.01) and in women (r=0.72, p<0.01). There was also a significant positive correlation in groups of 18-40 years (r=0.79, p<0.01) and 40-59 years (r=0.49, p<0.01), while in older than 60 years the correlation was positive but not significant (r=0.50, p=0.97). There was significant correlation in the group considered healthy by fat percentage (r=0.54, p<0.001), but there was no significant correlation in under fat and over fat groups (r=0.07 p=0.57, r=0.38 p=0.31 respectively). BMI ≥25 kg/m2 showed a sensitivity of 90%, specificity 75% and an area under the curve of 0.88 (95% CI from 0.81 to 0,95) to detect excess body fat. In conclusion, although the use of BMI as a predictor of excess fat is justified in this population, it is necessary to conduct more studies to develop additional indicators for assessing the nutritional status of in more comprehensive way, not only focused on overweight and obesity(AU)

Humans , Male , Female , Adolescent , Adult , Middle Aged , Body Mass Index , Nutritional Status , Body Fat Distribution , Obesity , Anthropometry