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Search Results: 1 - 10 of 19609 matches for " Cassiano Ricardo Rech "
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Validation of equations using anthropometric and bioelectrical impedance for estimating body composition of the elderly
Cassiano Ricardo Rech
Revista Brasileira de Cineantropometria e Desempenho Humano , 2006,
Abstract: The increase of the elderly population has enhanced the need for studying aging-related issues. In this context, the analysis of morphological alterations occurring with the age has been discussed thoroughly. Evidences point that there are few information on valid methods for estimating body composition of senior citizens in Brazil. Therefore, the objective of this study was to cross-validate equations using either anthropometric or bioelectrical impedance (BIA) data for estimation of body fat (%BF) and of fat-free mass (FFM) in a sample of older individuals from Florianópolis-SC, having the dual energy x-ray absorptiometry (DEXA) as the criterion-measurement. The group was composed by 180 subjects (60 men and 120 women) who participated in four community Groups for the elderly and were systematically randomly selected by a telephone interview, with age ranging from 60 to 81 years. The variables stature, body mass, body circumferences, skinfold thickness, reactance and resistance were measured in the morning at The Sports Center of the Federal University of Santa Catarina. The DEXA evaluation was performed in the afternoon at The Diagnosis Center through Image in Florianópolis-SC. Twenty anthropometric and 8 BIA equations were analyzed for cross-validation. For those equations that estimate body density, the equation of Siri (1961) and the adapted-equation by Deurenberg et al. (1989) were used for conversion into %BF. The analyses were performed with the statistical package SPSS, version 11.5, establishing the level of significance at 5%. The criteria of cross-validation suggested by Lohman (1992) and the graphic dispersion analyses in relation to the mean, as proposed by Bland and Altman (1986) were used. The group presented values for the body mass index (BMI) between 18.4kg.m-2 and 39.3kg.m-2. The mean %BF was of 23.1% (sd=5.8) for men and 37.3% (sd=6.9) in women, varying from 6% to 51.4%. There were no differences among the estimates of the equations converting body density into %BF (p<0.05). The general anthropometric equations developed by Tran and Weltman (1988) and by Deurenberg et al. (1991) showed to be valid for estimating %BF for males, with a standard error of estimate (SEE) ranging from 3.2% and 3.5% and significant correlations with the criterion- measurement (r = 0.78 and 0.74, respectively, p<0.05). For females, the general anthropometric equations of Durnin and Womersley (1974), Tran and Weltman (1988) and Gon alves specific equation (2004) were valid. These equations presented SEE ranging from 3.3% and 3.5%, with a constant error varyi
Impedancia bioelétrica bipolar: falta acuracidade para estimar a gordura relativa em homens
Rech, Cassiano Ricardo;Glaner, Maria Fátima;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2011, DOI: 10.5007/1980-0037.2011v13n2p100
Abstract: 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, height of 175.1 ± 6.5 cm, body mass index of 23.9 ± 2.2 kg/m2, %fbi 15.1 ± 4.4%, and %fdexa 17.7 ± 5.1%. a paired t-test, correlation test, standard error of the estimate (see), and residue analysis were used to evaluate the accuracy of the method. bi significantly (p < 0.05) underestimated %f and, the correlation between the two methods was moderate (r = 0.769). residue analysis showed the lack of agreement between the two methods, with an average error of -2.6 percentage points (95%ci: -9.1; 3.9). the see was above the recommended level (>3.5%f) in 42% of the sample. in subjects with higher fat accumulation (%f >20%), the omron bf bi model produced greater bias in the %f measurement. therefore, in the case of adult men, the omron bf 300 bi model does not agree with the dexa measurement for the estimation of %f in adult men. in addition, the higher the level of fat accumulation, the higher the error in estimated %f.
Bipolar bioelectrical impedance: lack of accuracy in estimating relative body fat in men. DOI: 10.5007/1980-0037.2011v13n2p100
Cassiano Ricardo Rech,Maria Fatima Glaner
Revista Brasileira de Cineantropometria e Desempenho Humano , 2011,
Abstract: 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, height of 175.1 ± 6.5 cm, body mass index of 23.9 ± 2.2 kg/m2, %FBI 15.1 ± 4.4%, and %FDEXA 17.7 ± 5.1%. A paired t-test, correlation test, standard error of the estimate (SEE), and residue analysis were used to evaluate the accuracy of the method. BI significantly (p < 0.05) underestimated %F and, the correlation between the two methods was moderate (r = 0.769). Residue analysis showed the lack of agreement between the two methods, with an average error of -2.6 percentage points (95%CI: -9.1; 3.9). The SEE was above the recommended level (>3.5%F) in 42% of the sample. In subjects with higher fat accumulation (%F >20%), the Omron BF BI model produced greater bias in the %F measurement. Therefore, in the case of adult men, the Omron BF 300 BI model does not agree with the DEXA measurement for the estimation of %F in adult men. In addition, the higher the level of fat accumulation, the higher the error in estimated %F.
Somatotype and body composition of referees and assistant referees from the CBF
Alberto Inacio da Silva,Cassiano Ricardo Rech
Revista Brasileira de Cineantropometria e Desempenho Humano , 2008,
Abstract: The aim of this study was to determine and compare the somatotype and body composition of principal soccer referees and assistant soccer referees from the state of Paraná in Brazil, all working for the Brazilian Soccer Confederation – (CBF Confedera ao Brasileira de Futebol). Twenty-five referees participated in this study: 12 principal referees (PR) and 13 assistant referees (AR), all male. The variables body mass, height, skinfolds, body girth and bone diameters were collected with the aim of estimating the referees’ body composition and determining their somatotypes. Data are presented in the form of descriptive statistics. Comparisons between the PR and AR groups were made using Student’s t test for independent samples. The PR referees had a mean age of 38.5 + 5.1 years of age, body mass of 80.9 + 7.61 Kg, mean height of 179 + 3.3 cm and an average percentage of fat of 20.81 + 3.29%. The AR group were significantly younger on average (37.3 + 3.1 years old, p < 0.05). None of the variables body mass (77.2 + 8.2 Kg), height (178.3 + 5.23) or percentage body fat (18.1 + 4.2%) exhibited any statistical differences. As for somatotypes, it was noted that the PR had predominantly endomorphic characteristics (3.9- 3.6-1.7), while the AR were characterized as mesomorphic (3.7-4.1-2.1). Significant differences were observed between the mesomorphic and ectomorphic components when referees and assistant referees were compared. Therefore, refereeing category was not influenced by the morphological profile of the referees who were analyzed. Resumo O objetivo do presente estudo foi determinar e comparar o somatotipo e a composi o corporal de árbitros e árbitros assistentes de futebol do Estado do Paraná, Brasil, que atuam junto à Confedera o Brasileira de Futebol (CBF). Participaram do estudo 25 árbitros, sendo 12 árbitros principais (AP) e 13 árbitros assistentes (AA) ambos do sexo masculino. As variáveis de massa corporal, estatura, espessura de dobras cutaneas, perímetros corporais e diametros ósseos foram coletados com a finalidade de estimar a composi o corporal e determinar o somatotipo dos árbitros. Os dados s o apresentados mediante estatística descritiva, a compara o entre os grupos de AP e AA foi realizada por meio do teste “t” de student para amostras independentes. Os AP apresentaram uma idade média de 38,5±5,1 anos, massa corporal de 80,9±7,61 kg, estatura 179±3,3 cm e um percentual de gordura médio de 20,81±3,29 %. O grupo de AA apresentou uma idade média menor (37,3±3,1 anos) significante (p<0,05). Já para as variáveis de massa corporal (77,2±8,
Nutritional status of six to ten-year-old schoolchildren in the municipal education system of arapoti - Paraná, Brazil
Eline Salomons,Cassiano Ricardo Rech,Mathias Roberto Loch
Revista Brasileira de Cineantropometria e Desempenho Humano , 2007,
Abstract: The objective of this study was to investigate the nutritional status of schoolchildren studying in the municipal education system of Arapoti, in the state of Paraná, Brazil. A total of 1,647 schoolchildren (842 boys and 805 girls) were studied, aged from 6 to 10 years. Their nutritional status was determined based on anthropometric measurements and expressed as weight for age, weight for height and height for age, according to the NCHS tables. Nutritional status was classifi ed according to the table proposed by Waterlow et al. (1977) as later adapted by Gomez (1983). Descriptive analysis and the chi-square test were employed to evaluate the signifi cance of possible associations between variables. The prevalence ratios of cases of malnutrition and overweight with relation to the age of the schoolchildren were also calculated. Analyses were carried out using Excel for Windows and SPSS version 10.0, adopting p<0.05. It was observed that 59.5% of the boys and 53.2% of the girls were well-nourished. The prevalence of malnutrition among boys was 1.4%, 10.5% and 9.1% for chronic, previous and current malnutrition, respectively. Among the girls, these prevalence rates were 1.4%, 12.2% and 11.1%, respectively. The prevalence of overweight was 9.4% for boys and 10.6% for girls. It was observed that 10.1% of the boys and 11.7% of the girls were obese. No associations were observed between nutritional status and sex or age in the sample studied here. These results indicate a relatively high prevalence of malnutrition and overweight, indicating the co-existence of both problems, which is to a certain extent coherent with the current state of epidemiological transition in Brazil, where older problems (such as malnutrition) and more recent problems (as is the case of obesity) are observed in the country. ABSTRACT Keywords Crescimento físico --- Estado nutricional --- Crian as --- Antropometria. Physical growth --- Nutritional status --- Children --- Anthropometry.
Utiliza??o da impedancia bioelétrica para estimativa da massa muscular esquelética em homens idosos
Augustemak de Lima,Luiz Rodrigo; Rech,Cassiano Ricardo; Petroski,Edio Luiz;
Archivos Latinoamericanos de Nutrición , 2008,
Abstract: the aim of the present study was twofold: a) to determine the agreement between bioelectrical impedance analysis (bia) and dual energy x-ray absorptiometry (dexa) for the estimation of skeletal muscle mass (smm), and b) to analyze the predictive power of anthropometric variables and bia for the prediction of smm in the elderly. sixty elderly men (61 to 80 years) from the southern region of brazil were studied. anthropometric variables (body weight and height) were measured, the resistance and hydration of fat-free tissues variables were determined by tetrapolar bia (bf-310, biodynamics). a whole body dexa scan was also performed (lunar prodigy df + 14319 radiation and 7.52.002 dpx-l software). differences between methods were analyzed using the t-test, analysis of residues and correlation coefficient. the predictive value of the anthropometric variables and bia was evaluated by multiple linear regression. bia overestimated smm on average by 0.60 kg (sd=1.59) when compared to dexa, however, no statistical difference was observed (p>0.05). there was a strong correlation between methods (r=0.90; p<0.01). regression analysis demonstrated that the ht2/r variable explained 86% of the variation in smm when adjusted for body weight and age, and this relationship did not depend on body fat, hydration of fat-free tissues or bmi. thus, bia as tested here is a valid method for the estimation of smm in elderly men and its values can be best predicted using the regression model proposed, which included ht2/r adjusted for body weight and age.
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.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2008, DOI: 10.1590/S0004-27302008000700013
Abstract: 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.
Sensitivity and specificity of the body mass index for the diagnosis of overweight/obesity in elderly
Vasconcelos, Francisco de Assis Guedes de;Cordeiro, Braian Alves;Rech, Cassiano Ricardo;Petroski, Edio Luiz;
Cadernos de Saúde Pública , 2010, DOI: 10.1590/S0102-311X2010000800006
Abstract: the aim of this article was to verify the sensitivity and specificity of the body mass index (bmi) cut-off points proposed by the world health organization (who) and the nutrition screening initiative (nsi) for the diagnosis of obesity in the elderly. a cross-sectional study was made with 180 healthy elderly subjects from florianópolis, santa catarina state, brazil. body fat percentage (%bf) was determined using dexa (dual energy x-ray absorptiometry). the bmi cut-off point of the nsi offers better sensitivity and specificity for men (73.7% and 72.5% respectively). for women, the lower the cut-off point the better the sensitivity, with a bmi of 25kg/m2 (sensitivity of 76.3% and specificity of 100%) being the most accurate for diagnosing obesity in elderly women. the who cut-off point offered very low sensitivity (28.9%). the results of this investigation lead to the conclusion that the cut-off points proposed by the who and the ones adopted by the nsi and by lipschitz are not good indicators of obesity for the elderly of either sex, since they offer low sensitivity.
Validade de equa??es antropométricas para estimar a massa muscular em idosos
Rech, Cassiano Ricardo;Dellagrana, Rodolfo André;Marucci, Maria de Fátima Nunes;Petroski, Edio Luiz;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n1p23
Abstract: the objective of this study was to compare skeletal muscle mass (smm) in older adults as estimated by dual-energy x-ray absorptiometry (dxa) and three predictive equations. a total of 180 older adults (120 women and 60 men) aged 60 to 81 years were studied. appendicular smm was measured by dxa and estimated using predictive equations based on anthropometric measures, age, race, and gender. agreement between methods was evaluated by the paired t-test, pearson's correlation coefficient, and dispersion error. the prevalence of sarcopenia estimated with the different methods was compared using the kappa coefficient, sensitivity, and specificity. no difference was observed in mean smm estimated by the predictive equation of lee et al. and dxa (p>0.05), with a high correlation between methods in men (r=0.90; p<0.001) and women (r=0.86; p<0.001). the prevalence of sarcopenia did not differ between methods (dxa = 33.3% vs. equation = 36.1%), with high agreement between methods (kappa = 0.74; p<0.001) and high specificity (89%) and sensitivity (86%). the results indicate agreement between dxa and the predictive equation of lee et al. for estimation of smm and prevalence of sarcopenia in older adults.
Validade e fidedignidade de um instrumento para avaliar as barreiras para o uso de bicicleta em adultos
Kienteka, Marilson;Rech, Cassiano Ricardo;Fermino, Rogério César;Reis, Rodrigo Siqueira;
Revista Brasileira de Cineantropometria & Desempenho Humano , 2012, DOI: 10.5007/1980-0037.2012v14n6p624
Abstract: the purpose of this study was to analyze the validity and reliability of an instrument to assess the perception of barriers related to bicycling for leisure and transportation in adults. the items composing the instrument were selected from the literature review on the subject. content validity was analyzed by consulting experts in physical activity field. the reliability was assessed through internal consistency (cronbach's alpha) and agreement (intraclass correlation coefficient (icc), kappa coefficient and relative agreement in a sample of 66 adults (18-79 years old) selected from three census tracts in curitiba-pr. data were analyzed using spss 17.0, with a significance level of 5%. most of the sample consisted of women (60%), aged> 40 years (47%) and intermediate socioeconomic level (68%). the frequency of bicycling in leisure time was higher than for transportation means (15.2 vs 7.6%). the internal consistency (cronbach's alpha) was significant, both in leisure time (α=0.77) and transportation (α=0.82). the agreement was higher for leisure (80.3 to 93.9%) than compared to commuting (76.9 to 90.8%). kappa values were moderate to high (leisure: 0.41 to 0.82: commuting: 0.53 to 0.82). the icc sub-scores were 0.93 (ci95%: 0.88 to 0.96) and 0.89 (ci95%: 0.82 to 0.94) for leisure and transport, respectively. it follows that the instrument has psychometric quality suitable for measuring the barriers to bicycle use in adults.
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