title: Body composition determination in children using bioelectrical impedance.
abstract: Estimation of body composition by measurement of tetrapolar bioelectrical resistive impedance (R) is a technique only recently validated in adults. To evaluate this technique in children, 16 girls aged 11.6 +/- 0.9 yr (mean +/- SD) and 14 boys aged 12.5 +/- 1.0 yr were assessed for fat free mass (FFM) by hydrostatic weighing, total body potassium (TBK) by whole body counting of 40K, and R by an electrical impedance plethysmograph. Significant relationships (P less than 0.001) were demonstrated between TBK and ht2/R (r = 0.92), and FFM and ht2/R (r = 0.83). The reliability coefficient for the impedance measurements was r = 0.97. The following equation describes FFM in the present group of children: FFM (kg) = 6.86 + 0.81 x (ht2/R), r = 0.83, P less than 0.001, SEE = 4.08. These data suggest that impedance measurements are valid and reliable predictors of FFM in pediatric populations.
authors.affiliation: Department of Exercise and Sport Science, Colorado State University, Fort Collins 80523.
authors.forename: L
authors.initials: L
authors.lastname: Cordain
authors.forename: R E
authors.initials: RE
authors.lastname: Whicker
authors.forename: J E
authors.initials: JE
authors.lastname: Johnson
mesh_terms: D000273:Adipose Tissue / Q000032:analysis; D000293:Adolescent; D001823:Body Composition; D001834:Body Water / Q000032:analysis; D001835:Body Weight; D002648:Child; D004553:Electric Conductivity; D005260:Female; D006801:Humans; D008297:Male; D011188:Potassium / Q000032:analysis; D012044:Regression Analysis
chemical_list: D011188:Potassium