title: Evaluation of modified multicompartment models to calculate body composition in healthy males.
abstract: The purpose of this study was to develop flexible and accurate multicompartment equations to calculate body composition and compare the results with methods using common two-compartment equations. Twenty-two healthy male volunteers 22-59 y of age were studied. Body volume was measured by underwater weighing (UWW) or with a skinfold caliper, bone mineral by dual-energy X-ray absorptiometry (DXA), and body water by bioelectrical impedance analysis (BIA). The percentage of water and bone mineral in fat-free mass (FFM) had a significant effect on the difference in percentage fat obtained by the two-compartment model compared with a four-compartment model. FFM density was negatively (r = -0.76, P < 0.001) and percentage water in FFM was positively correlated with age (r = 0.75, P < 0.001). The three-compartment model based on field-adapted methods (skinfold thickness + BIA) to calculate percentage body fat correlated significantly with the more complex four-compartment model (UWW + BIA + DXA; r = 0.95, P < 0.001). The advantages of three- and four-compartment equations are that they compensate for differences in body content of bone mineral and water.
authors.affiliation: Department of Nutrition, Uppsala University, Sweden.
authors.forename: A H
authors.initials: AH
authors.lastname: Forslund
authors.forename: A G
authors.initials: AG
authors.lastname: Johansson
authors.forename: A
authors.initials: A
authors.lastname: Sjödin
authors.forename: G
authors.initials: G
authors.lastname: Bryding
authors.forename: S
authors.initials: S
authors.lastname: Ljunghall
authors.forename: L
authors.initials: L
authors.lastname: Hambraeus
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D001823:Body Composition / Q000502:physiology*; D015992:Body Mass Index; D001834:Body Water; D001835:Body Weight / Q000502:physiology; D015519:Bone Density; D017097:Electric Impedance; D006801:Humans; D007101:Immersion; D008055:Lipids / Q000032:analysis; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D012885:Skinfold Thickness
chemical_list: D008055:Lipids