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
Rev. méd. Chile
;
148(10)oct. 2020.
Artigo
em Espanhol
| LILACS
| ID: biblio-1389223
ABSTRACT
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 andMethods:
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.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Composição Corporal
Tipo de estudo:
Guia de Prática Clínica
Limite:
Adulto
/
Feminino
/
Humanos
/
Masculino
País/Região como assunto:
América do Sul
/
Chile
Idioma:
Espanhol
Revista:
Rev. méd. Chile
Assunto da revista:
Medicina
Ano de publicação:
2020
Tipo de documento:
Artigo
Similares
MEDLINE
...
LILACS
LIS