title: Validity and reliability of body composition analysers in children and adults.
abstract: We tested the validity and reliability of the BioSpace InBody 320, Omron and Bod-eComm body composition devices in men and women (n 254; 21-80 years) and boys and girls (n 117; 10-17 years). We analysed percentage body fat (%BF) and compared the results with dual-energy X-ray absorptiometry (DEXA) in adults and compared the results of the InBody with underwater weighing (UW) in children. All body composition devices were correlated (r 0.54-0.97; P< or =0.010) to DEXA except the Bod-eComm in women aged 71-80 years (r 0.54; P=0.106). In girls, the InBody %BF was correlated with UW (r 0.79; P< or =0.010); however, a more moderate correlation (r 0.69; P< or =0.010) existed in boys. Bland-Altman plots indicated that all body composition devices underestimated %BF in adults (1.0-4.8 %) and overestimated %BF in children (0.3-2.3 %). Lastly, independent t tests revealed that the mean %BF assessed by the Bod-eComm in women (aged 51-60 and 71-80 years) and in the Omron (age 18-35 years) were significantly different compared with DEXA (P< or =0.010). In men, the Omron (aged 18-35 years), and the InBody (aged 36-50 years) were significantly different compared with DEXA (P=0.025; P=0.040 respectively). In addition, independent t tests indicated that the InBody mean %BF in girls aged 10-17 years was significantly different from UW (P=0.001). Pearson's correlation analyses demonstrated that the Bod-eComm (men and women) and Omron (women) had significant mean differences compared with the reference criterion; therefore, the %BF output from these two devices should be interpreted with caution. The repeatability of each body composition device was supported by small CV (<3.0 %).
authors.affiliation: Division of Biokinesiology and Physical Therapy, School of Dentistry, Clinical Exercise Research Center, University of Southern California, 1540 East Alcazar Street, CHP-155, Los Angeles, CA 90033, USA.
authors.forename: Nicole E
authors.initials: NE
authors.lastname: Jensky-Squires
authors.forename: Christina M
authors.initials: CM
authors.lastname: Dieli-Conwright
authors.forename: Amerigo
authors.initials: A
authors.lastname: Rossuello
authors.forename: David N
authors.initials: DN
authors.lastname: Erceg
authors.forename: Scott
authors.initials: S
authors.lastname: McCauley
authors.forename: E Todd
authors.initials: ET
authors.lastname: Schroeder
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000033:anatomy & histology; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D000886:Anthropometry / Q000295:instrumentation* / Q000379:methods; D001823:Body Composition; D002648:Child; D017097:Electric Impedance; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010991:Plethysmography; D012680:Sensitivity and Specificity; D012737:Sex Factors; D044465:White People