Variations in truncal body circumferences affect fat mass quantification with bioimpedance analysis.
Eur J Clin Nutr
; 66(2): 196-200, 2012 Feb.
Article
em En
| MEDLINE
| ID: mdl-21897422
ABSTRACT
OBJECTIVE:
To test the hypothesis that variations in trunk circumferences influence the accuracy of bioimpedance analysis (BIA) for assessment of percent fat mass (%FM). SUBJECTS ANDMETHODS:
%FM was predicted with BIA, and compared with air-displacement plethysmography (ADP) in a small sample of 35 overweight (OW), 21 normal weight and 8 underweight volunteers. Waist and hip circumferences were assessed, and 15 of the OW subjects were measured before and after weight reduction.RESULTS:
BIA and ADP provided similar cross-sectional estimates of group mean %FM (28.9±10.0 and 31.3±13.0%, respectively). However, within individuals, there were large between-method differences (Diff(BIA-ADP)) ranging from -13 to +13 %FM. Furthermore, we found a systematic bias of BIA related to the degree of adiposity. Consequently, %FM and fat mass loss during weight reduction in OW were underestimated with BIA when compared with ADP. Waist and hip circumferences were inversely associated with resistance (R) and reactance (P<0.01), and with Diff(BIA-ADP) (P<0.001). In women, the variability in hip circumference explained 76%, and in men, the variability in waist circumference explained 59% of Diff(BIA-ADP).CONCLUSION:
Resistance changes associated with variations in trunk circumferences decrease resistance, and therefore impair the accuracy of BIA to assess %FM.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Composição Corporal
/
Redução de Peso
/
Índice de Massa Corporal
/
Tecido Adiposo
/
Sobrepeso
/
Circunferência da Cintura
/
Quadril
Tipo de estudo:
Observational_studies
/
Prevalence_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article