Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal

Background: Equations for the evaluation of fat-free mass (FFM) and fat mass (FM) with Bioelectrical impedance analysis (BIA) were formulated in Caucasian populations. International recommendations suggest that population-specific equations should be formulated. Aim: To validate an equation previo...

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Autores principales:	Schifferli,Ingrid, Orellana-Cáceres,Juan José, Morales,Gladys, Inostroza,Jorge, Carrasco,Fernando
Lenguaje:	Spanish / Castilian
Publicado:	Sociedad Médica de Santiago 2020
Materias:	Dual-Energy X-Ray Absorptiometry Adipose Tissue Body Composition Electric Impedance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872020001001435
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spelling	oai:scielo:S0034-988720200010014352021-02-02Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporalSchifferli,IngridOrellana-Cáceres,Juan JoséMorales,GladysInostroza,JorgeCarrasco,Fernando Dual-Energy X-Ray Absorptiometry Adipose Tissue Body Composition Electric Impedance Background: Equations for the evaluation of fat-free mass (FFM) and fat mass (FM) with Bioelectrical impedance analysis (BIA) were formulated in Caucasian populations. International recommendations suggest that population-specific equations should be formulated. Aim: To validate an equation previously formulated in Chileans adults and compare it to a new equation generated on an independent sample. Material and Methods: In 108 adult volunteers aged 38.1±14.1 years (44% males), with a body mass index (BMI) of 25.1± 4.1 kg/m2, body composition was measured by BIA (Bodystat) and dual X-ray absorptiometry (DXA: Lunar Prodigy). Body composition estimated using Schifferli equation and BIA were compared with DEXA, by the Bland-Altman method and simple linear regression. Results: FFM and FM measured by DXA were 45.2 ± 9.8 kg and 29.6 ± 11.7 % respectively. Resistance was 467.7 ± 76.3 ohm. Schifferli equation and BIA significantly overestimated FFM by 7.3 and 7.4 kg, respectively. The error was higher for high levels of FFM (slope β < 1, p < 0.01). Both equations underestimated FM measured by DXA (averages of 7.5 and 7.8%, respectively, p < 0.01), without a differential bias for Schifferli equation, but with a bias in low levels of FM measured with BIA (slope β < 1, p < 0.01). Estimation biases could be eliminated using the regression coefficients. Conclusions: Both equations behave similarly and have biases, although less with Schifferli. Statistically correcting for biases, the new adjusted equations provide clinically valid estimates of FFM and FM. Equations should not only be population-specific, but also device-specific.info:eu-repo/semantics/openAccessSociedad Médica de SantiagoRevista médica de Chile v.148 n.10 20202020-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872020001001435es10.4067/S0034-98872020001001435
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	Dual-Energy X-Ray Absorptiometry Adipose Tissue Body Composition Electric Impedance
spellingShingle	Dual-Energy X-Ray Absorptiometry Adipose Tissue Body Composition Electric Impedance Schifferli,Ingrid Orellana-Cáceres,Juan José Morales,Gladys Inostroza,Jorge Carrasco,Fernando Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
description	Background: Equations for the evaluation of fat-free mass (FFM) and fat mass (FM) with Bioelectrical impedance analysis (BIA) were formulated in Caucasian populations. International recommendations suggest that population-specific equations should be formulated. Aim: To validate an equation previously formulated in Chileans adults and compare it to a new equation generated on an independent sample. Material and Methods: In 108 adult volunteers aged 38.1±14.1 years (44% males), with a body mass index (BMI) of 25.1± 4.1 kg/m2, body composition was measured by BIA (Bodystat) and dual X-ray absorptiometry (DXA: Lunar Prodigy). Body composition estimated using Schifferli equation and BIA were compared with DEXA, by the Bland-Altman method and simple linear regression. Results: FFM and FM measured by DXA were 45.2 ± 9.8 kg and 29.6 ± 11.7 % respectively. Resistance was 467.7 ± 76.3 ohm. Schifferli equation and BIA significantly overestimated FFM by 7.3 and 7.4 kg, respectively. The error was higher for high levels of FFM (slope β < 1, p < 0.01). Both equations underestimated FM measured by DXA (averages of 7.5 and 7.8%, respectively, p < 0.01), without a differential bias for Schifferli equation, but with a bias in low levels of FM measured with BIA (slope β < 1, p < 0.01). Estimation biases could be eliminated using the regression coefficients. Conclusions: Both equations behave similarly and have biases, although less with Schifferli. Statistically correcting for biases, the new adjusted equations provide clinically valid estimates of FFM and FM. Equations should not only be population-specific, but also device-specific.
author	Schifferli,Ingrid Orellana-Cáceres,Juan José Morales,Gladys Inostroza,Jorge Carrasco,Fernando
author_facet	Schifferli,Ingrid Orellana-Cáceres,Juan José Morales,Gladys Inostroza,Jorge Carrasco,Fernando
author_sort	Schifferli,Ingrid
title	Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
title_short	Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
title_full	Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
title_fullStr	Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
title_full_unstemmed	Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
title_sort	validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal
publisher	Sociedad Médica de Santiago
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0034-98872020001001435
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Validación y generación de ecuaciones para estimar masa grasa corporal en adultos chilenos, formuladas a partir de bioimpedanciometría, en un amplio rango de edad e índice de masa corporal

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