title: Validity of methods of body composition assessment in young and older men and women.
abstract: We examined the validity of percent body fat (%Fat) estimation by two-compartment (2-Comp) hydrostatic weighing (Siri 2-Comp), 3-Comp dual-energy X-ray absorptiometry (DEXA 3-Comp), 3-Comp hydrostatic weighing corrected for the total body water (Siri 3-Comp), and anthropometric methods in young and older individuals (n = 78). A 4-Comp model of body composition served as the criterion measure of %Fat (Heymsfield 4-Comp; S. B. Heymsfield, S. Lichtman, R. N. Baumgartner, J. Wang, Y. Kamen, A. Aliprantis, and R. N. Pierson Jr., Am. J. Clin. Nutr. 52: 52-58, 1990.). Comparison of the Siri 3-Comp with the Heymsfield 4-Comp model revealed mean differences of </=0.4 %Fat, r values >/= r = 0.997, total error values </= 0.85 %Fat, and 95% confidence intervals (Bland-Altman analysis) of </=1.7 %Fat. Comparison of Siri 2-Comp, DEXA, and anthropometric models with the Heymsfield 4-Comp revealed that total error scores ranged from +/-4. 0 to +/-10.7 %Fat, and 95% confidence intervals associated with the Bland-Altman analysis ranged from +/-5.1 to +/-15.0 %Fat. We conclude that the Siri 3-Comp model provides valid and accurate body composition data when compared with a 4-Comp criterion model. However, the individual variability associated with the Siri 2-Comp, DEXA 3-Comp, and anthropometric models may limit their use in research settings. The use of anthropometric estimation methods resulted in large mean differences and a considerable amount of interindividual variability. These data suggest that the use of these techniques should be viewed with caution.
authors.affiliation: Department of Internal Medicine, University of Virginia, Charlottesville, Virginia 22908, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Clasey
authors.forename: J A
authors.initials: JA
authors.lastname: Kanaley
authors.forename: L
authors.initials: L
authors.lastname: Wideman
authors.forename: S B
authors.initials: SB
authors.lastname: Heymsfield
authors.forename: C D
authors.initials: CD
authors.lastname: Teates
authors.forename: M E
authors.initials: ME
authors.lastname: Gutgesell
authors.forename: M O
authors.initials: MO
authors.lastname: Thorner
authors.forename: M L
authors.initials: ML
authors.lastname: Hartman
authors.forename: A
authors.initials: A
authors.lastname: Weltman
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D000886:Anthropometry; D001823:Body Composition / Q000502:physiology*; D001834:Body Water / Q000502:physiology; D003720:Densitometry; D005260:Female; D006801:Humans; D008297:Male; D008954:Models, Biological; D012885:Skinfold Thickness