title: Total-body electrical conductivity (TOBEC): relationship to estimates of muscle mass, fat-free weight, and lean body mass.
abstract: A comparison of methods for estimating body composition (BC) of 12 subjects was made by using fat-free weight from total-body electrical conductivity (FFWT), muscle mass from 3-methylhistidine excretion (MM3MH) and creatinine excretion (MMCRE), fat-free weight from hydrostatic weighing (FFWBD), and lean body mass from whole-body potassium counting (LBMK). Data were analyzed for day-to-day variability and regression analyses were applied to compare the different methods of measuring BC. Mean values (+/- SEM, kg) for the estimates were 53.9 +/- 3.5 (FFWT), 26.9 +/- 2.9 (MM3MH), 25.3 +/- 2.5 (MMCRE), 53.2 +/- 3.6 (FFWBD), and 52.8 +/- 3.5 (LBMK). Regression analyses revealed that TOBEC estimates of fat-free weight had an adjusted r2 (+/- SEE, kg) of 0.95 +/- 2.2, 0.50 +/- 7.9, 0.95 +/- 1.8, and 0.88 +/- 4.0 for MM3MH, MMCRE, FFWBD, and LBMK, respectively. It was concluded that TOBEC is a potentially reliable method for estimating the muscle mass within the fat-free compartment, as well as fat-free weight and lean body mass.
authors.affiliation: University of Illinois-UC.
authors.forename: C A
authors.initials: CA
authors.lastname: Horswill
authors.forename: R
authors.initials: R
authors.lastname: Geeseman
authors.forename: R A
authors.initials: RA
authors.lastname: Boileau
authors.forename: B T
authors.initials: BT
authors.lastname: Williams
authors.forename: D K
authors.initials: DK
authors.lastname: Layman
authors.forename: B H
authors.initials: BH
authors.lastname: Massey
mesh_terms: D000273:Adipose Tissue / Q000033:anatomy & histology; D001823:Body Composition; D001835:Body Weight; D003404:Creatinine / Q000652:urine; D004553:Electric Conductivity; D005260:Female; D006801:Humans; D008297:Male; D008762:Methylhistidines / Q000652:urine; D009132:Muscles / Q000033:anatomy & histology; D011188:Potassium / Q000032:analysis
chemical_list: D008762:Methylhistidines; D003404:Creatinine; C028118:3-methylhistidine; D011188:Potassium