Estimate equation of body composition of the elderly male/Equacao de estimativa da composicao corporal de idosos do sexo masculino/Estimar la ecuacion de composicion corporal de hombres

• Published in: Revista de salud pública (Bogotá, Colombia) Colombia), 2014-10, Vol.16 (5), p.753
• Main Authors: Goncalves, Eliane Cunha, Policarpo, Fernando, Fernandes-Filho, Jose
• Format: Article
• Language: Spanish
• Subjects: Aged; Comparative analysis; Physiological aspects
• ISSN: 0124-0064
• DOI: 10.15446/rsap.v16n5.40161

Objectives This study aims to develop and validate a predictive body composition equation in elderly men. Methodology Correlational study using a sample of 85 men with 69.5±5, 8 years from Vitoria, Brazil. The sample was divided in two groups: the regression group (n = 54) was used to develop the predictive equation and a validation group (n = 31). The following measurements: skinfolds (S), bone diameter (BD) and body circumferences (BC), body fat percent (%BF) measure by DXA. The predictive equations were developed using multiple linear regressions and validated through the stepwise method. Equations were compared using Student's T test for paired samples. Residual scores were analyzed using the Blant and Altman method. Results The regression group had 68.5 ± 4, 5 years, 78, 5 ± 14, 4 kg; 1, 6 ± 0, 6 m, and % BF 30.4 ± 6, 8. The validation group had 71.2 ± 7.4 years, body weight 75.2 ± 11 kg, height 1.6 ± 0.5 m, and % BF 29.4 ± 7.7. The resulting predictive equation is % body fat = 23.371 + 0.337 (BC abdomen)-1.464 (BC left arm) + 0.501 (S calf) + 0.175 (body weight)-0.741 (BD acromial)-0.415 (BC biiliocristal) + 0.374 (Cleft tight) + 0.370 (BC neck). The best-fit plot was significant due to the correlation coefficient r = 0.8. The [r.sup.2] was 0.8, meaning that the independent variables are able to explain 87% of the estimate. The EPE was 2.6%. Conclusion In light of the current results, the equation was considered adequate to estimate body composition in elderly men. The equation can be a simple and accurate alternative to estimate body fat in this population. Key Words: Body composition, aged; men (source: MeSH, NLM). Objetivo Desenvolver e validar uma equacao de estimativa da composicao corporal de homens idosos. Metodologia Correlacional com 85 homens com 69,5 ± 5,8 anos residentes na Grande Vitoria, divididos em dois grupos: regressao (n = 54) para o desenvolvimento das equacoes, e validacao (n = 31). Foram mensurados perimetros (P), dobras cutaneas (DC) e diametros osseos (DO) e o percentual de gordura (%G) determinado pela DXA (Dual X-Ray). As equacoes foram desenvolvidas por meio da regressao linear multipla, com validacao pelo metodo stepwise; a comparacao das equacoes foi pelo teste t de Student pareado e a analise dos escores residuais pelo metodo de Blant e Altman. Resultados O grupo de regressao com 68,5 ± 4, 5 anos, massa corporal de 78, 5 ± 14,4 kg e 1,6 ± 0,6m; % G de 30,4 ± 6,8%; o grupo de validacao foi de 71, 2 ± 7,4 anos, 75,2 ± 11 k