Document Detail

Four-component model of body composition in children: density and hydration of fat-free mass and comparison with simpler models.
MedLine Citation:
PMID:  10232629     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Body composition in children is generally measured by 2-component (2C) models, which are subject to error arising from variation in fat-free mass (FFM) composition. The 4-component (4C) model, which divides body weight into fat, water, mineral, and protein, can overcome these limitations.
OBJECTIVE: The aims of our study were to 1) describe 4C model data for children aged 8-12 y; 2) evaluate interindividual variability in the hydration, bone mineral content, and density of FFM; 3) evaluate the success with which 2C models and bedside techniques measure body composition in this age group with use of the 4C model as a reference.
DESIGN: Dual-energy X-ray absorptiometry, underwater weighing, deuterium dilution, bioelectrical impedance analysis, and anthropometry were used to determine body composition in 30 children. The contribution of methodologic error to the observed variability in the hydration and density of FFM was evaluated by using propagation of error.
RESULTS: Mean (+/-SD) FFM density and hydration were 1.0864+/-0.0074 kg/L and 75.3+/-2.2%, respectively, and were significantly different from adult values (P < 0.02). Relative to the 4C model, deuterium dilution and dual-energy X-ray absorptiometry showed no mean bias for fatness, whereas underwater weighing underestimated fatness (P < 0.025). Fatness determined by using skinfold-thickness and bioelectrical impedance analysis measurements along with published equations showed poor agreement with 4C model data.
CONCLUSIONS: Biological variability and methodologic error contribute equally to the variability of FFM composition. Our findings have major implications for bedside prediction methods used for children, traditionally developed in relation to underwater weighing.
J C Wells; N J Fuller; O Dewit; M S Fewtrell; M Elia; T J Cole
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  69     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  1999 May 
Date Detail:
Created Date:  1999-05-20     Completed Date:  1999-05-20     Revised Date:  2013-04-29    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  904-12     Citation Subset:  AIM; IM    
Dunn Clinical Nutrition Centre, Cambridge, United Kingdom.
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MeSH Terms
Adipose Tissue
Body Composition*
Body Mass Index*
Body Water
Bone Density
Models, Biological*
Regression Analysis
Reproducibility of Results
Specific Gravity
Grant Support
G9827821//Medical Research Council; G9827821(62595)//Medical Research Council

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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