title: In vivo precision of the GE Lunar iDXA densitometer for the measurement of total body composition and fat distribution in adults.
abstract: In vivo precision for body composition measurements using dual energy X-ray absorptiometry (DXA; GE Lunar iDXA, GE Healthcare, Bucks, UK) was evaluated in 52 men and women, aged 34.8 (s.d. 8.4; range 20.1-50.5) years, body mass index (25.8 kg/m(2); range 16.7-42.7 kg/m(2)). Two consecutive total body scans (with re-positioning) were conducted. Precision was excellent for all measurements, particularly for total body bone mineral content and lean tissue mass (root mean square 0.015 and 0.244 kg; coefficients of variation (CV) 0.6 and 0.5%, respectively). Precision error was CV 0.82% for total fat mass and 0.86% for percentage fat. Precision was better for gynoid (root mean square 0.397 kg; CV 0.96%) than for android fat distribution (root mean square 0.780 kg, CV 2.32%). There was good agreement between consecutive measurements for all measurements (slope (s.e.) 0.993-1.002; all R(2) = 0.99). The Lunar iDXA provided excellent precision for total body composition measurements. Research into the effect of body size on the precision of DXA body fat distribution measurements is required.
authors.affiliation: DXA Unit, Carnegie Faculty of Sport and Education, Carnegie Research Institute, Leeds Metropolitan University, Headingley Campus, Leeds, UK. k.hind@leedsmet.ac.uk
authors.forename: K
authors.initials: K
authors.lastname: Hind
authors.forename: B
authors.initials: B
authors.lastname: Oldroyd
authors.forename: J G
authors.initials: JG
authors.lastname: Truscott
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation*; D000273:Adipose Tissue / Q000737:chemistry / Q000000981:diagnostic imaging*; D000328:Adult; D000704:Analysis of Variance; D001823:Body Composition; D050218:Body Fat Distribution; D015992:Body Mass Index; D015519:Bone Density; D015331:Cohort Studies; D003720:Densitometry / Q000379:methods*; D005223:Fats; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity; D055815:Young Adult
chemical_list: D005223:Fats