title: Body composition of adult cystic fibrosis patients and control subjects as determined by densitometry, bioelectrical impedance, total-body electrical conductivity, skinfold measurements, and deuterium oxide dilution.
abstract: This study contrasts body compositions (by six methods) of eight cystic fibrosis (CF) subjects with those of eight control subjects matched for age, height, and sex. CF subjects weighed 84% as much as control subjects. Densitometry and two bioelectrical impedance-analysis methods suggested that reduced CF weights were due to less lean tissue (10.7, 9.5, and 10.4 kg). Total-body electrical conductivity (TOBEC) and skinfold-thickness measurements indicated that CF subjects were leaner than control subjects and had less fat (5.4 and 3.6 kg) and less lean (5.2 and 7 kg) tissue. D2O dilution showed a pattern similar to TOBEC (8.3 kg less lean, 2.7 kg less fat tissue). Densitometry estimates of fat (mass and percent) were not correlated (r less than 0.74, p greater than 0.05) with any other method for CF subjects but were correlated with all other methods for control subjects. CF subjects contained less fat and lean tissue than did control subjects. Densitometry by underwater weighing is unsuitable for assessing body composition of CF patients.
authors.affiliation: Department of Animal Science, University of California, Davis 95616.
authors.forename: M J
authors.initials: MJ
authors.lastname: Newby
authors.forename: N L
authors.initials: NL
authors.lastname: Keim
authors.forename: D L
authors.initials: DL
authors.lastname: Brown
mesh_terms: D000273:Adipose Tissue; D000328:Adult; D001823:Body Composition; D001834:Body Water; D001835:Body Weight; D003550:Cystic Fibrosis / Q000503:physiopathology*; D003720:Densitometry; D003903:Deuterium; D017666:Deuterium Oxide; D004553:Electric Conductivity; D005260:Female; D006801:Humans; D007201:Indicator Dilution Techniques; D008297:Male; D012885:Skinfold Thickness; D014867:Water
chemical_list: D014867:Water; D003903:Deuterium; D017666:Deuterium Oxide