Josely Correa Koury1, Maria Almeida Ribeiro2, Fabia Albernaz Massarani2, Filomena Vieira3, Elisabetta Marini4. 1. Department of Basic and Experimental Nutrition, Nutrition Institute, State University of Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: jckoury@gmail.com. 2. Department of Basic and Experimental Nutrition, Nutrition Institute, State University of Rio de Janeiro, Rio de Janeiro, Brazil. 3. Interdisciplinary Study of Human Performance Center, Faculty of Human Kinetics, University of Lisbon, Cruz Quebrada, Portugal. 4. Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.
Abstract
OBJECTIVES: The aims of this study were to evaluate the effect of biological maturity on body composition in Brazilian adolescent athletes, to verify the accuracy of previous bioimpedance predictive equations for estimating fat-free mass (FFM), and to develop new predictive equations, considering sexual and skeletal maturity. METHODS: There were 318 Brazilian adolescent athletes (52% male) involved in this study. FFM was determined using single-frequency (50 kHz) bioelectrical impedance analysis (BIA) and dual-energy x-ray absorptiometry (DXA), which was used as the reference method. The adolescents were classified into skeletally mature using bone age (both sexes), and sexually mature using menarche occurrence (female). The effect of maturity on bioelectrical values was tested using bioelectrical impedance vector analysis. Three predictive BIA equations to estimate FFM were selected from the reviewed literature. Lin's concordance correlation coefficient and Bland-Altman test were used to test the concordance and accuracy of BIA equations. Stepwise multiple regression was used to develop new predictive equations, considering BIA vectors, age, skeletal, and sexual maturity. RESULTS: DXA and BIA results showed wide limits of disagreement for FFM for all the three equations. Two new equation models were developed, including age and skeletal maturity for both sexes and menarche status for females. Both models showed high R2 (males = 0.92 and females = 0.84). CONCLUSIONS: The assessment of body composition in adolescent athletes should consider sexual (female) or skeletal (male) maturity. The newly proposed equations showed promising results in Brazilian adolescent athletes. A test in different groups and populations is necessary to evaluate the general suitability of the equations in adolescents.
OBJECTIVES: The aims of this study were to evaluate the effect of biological maturity on body composition in Brazilian adolescent athletes, to verify the accuracy of previous bioimpedance predictive equations for estimating fat-free mass (FFM), and to develop new predictive equations, considering sexual and skeletal maturity. METHODS: There were 318 Brazilian adolescent athletes (52% male) involved in this study. FFM was determined using single-frequency (50 kHz) bioelectrical impedance analysis (BIA) and dual-energy x-ray absorptiometry (DXA), which was used as the reference method. The adolescents were classified into skeletally mature using bone age (both sexes), and sexually mature using menarche occurrence (female). The effect of maturity on bioelectrical values was tested using bioelectrical impedance vector analysis. Three predictive BIA equations to estimate FFM were selected from the reviewed literature. Lin's concordance correlation coefficient and Bland-Altman test were used to test the concordance and accuracy of BIA equations. Stepwise multiple regression was used to develop new predictive equations, considering BIA vectors, age, skeletal, and sexual maturity. RESULTS: DXA and BIA results showed wide limits of disagreement for FFM for all the three equations. Two new equation models were developed, including age and skeletal maturity for both sexes and menarche status for females. Both models showed high R2 (males = 0.92 and females = 0.84). CONCLUSIONS: The assessment of body composition in adolescent athletes should consider sexual (female) or skeletal (male) maturity. The newly proposed equations showed promising results in Brazilian adolescent athletes. A test in different groups and populations is necessary to evaluate the general suitability of the equations in adolescents.
Authors: Roberto Fernandes da Costa; Analiza M Silva; Kalina Veruska da Silva Bezerra Masset; Tatianny de Macêdo Cesário; Breno Guilherme de Araújo Tinoco Cabral; Gerson Ferrari; Paulo Moreira Silva Dantas Journal: Front Nutr Date: 2022-03-17
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Authors: Stefania Toselli; Elisabetta Marini; Pasqualino Maietta Latessa; Luca Benedetti; Francesco Campa Journal: Int J Environ Res Public Health Date: 2020-01-22 Impact factor: 3.390
Authors: Marcus Vinicius de Oliveira Cattem; Bruna Taranto Sinforoso; Francesco Campa; Josely Correa Koury Journal: Int J Environ Res Public Health Date: 2021-06-04 Impact factor: 3.390