title: Validity of segmental bioelectrical impedance analysis for estimating fat-free mass in children including overweight individuals.
abstract: This study examined the validity of segmental bioelectrical impedance (BI) analysis for predicting the fat-free masses (FFMs) of whole-body and body segments in children including overweight individuals. The FFM and impedance (Z) values of arms, trunk, legs, and whole body were determined using a dual-energy X-ray absorptiometry and segmental BI analyses, respectively, in 149 boys and girls aged 6 to 12 years, who were divided into model-development (n = 74), cross-validation (n = 35), and overweight (n = 40) groups. Simple regression analysis was applied to (length)2/Z (BI index) for each of the whole-body and 3 segments to develop the prediction equations of the measured FFM of the related body part. In the model-development group, the BI index of each of the 3 segments and whole body was significantly correlated to the measured FFM (R2= 0.867-0.932, standard error of estimation = 0.18-1.44 kg (5.9%-8.7%)). There was no significant difference between the measured and predicted FFM values without systematic error. The application of each equation derived in the model-development group to the cross-validation and overweight groups did not produce significant differences between the measured and predicted FFM values and systematic errors, with an exception that the arm FFM in the overweight group was overestimated. Segmental bioelectrical impedance analysis is useful for predicting the FFM of each of whole-body and body segments in children including overweight individuals, although the application for estimating arm FFM in overweight individuals requires a certain modification.
authors.affiliation: a School of International Liberal Studies, Chukyo University 101 Tokodachi, Kaizu-cho, Toyota-shi, Aichi 470-0393, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Ohta
authors.affiliation: b College of Health and Welfare, J.F. Oberlin University 3758 Tokiwa-machi, Machida-shi, Tokyo 194-0294, Japan.
authors.forename: Taishi
authors.initials: T
authors.lastname: Midorikawa
authors.affiliation: c Faculty of Engineering, Chiba Institute of Technology, 2-1-1 Shibazono, Narashino-shi, Chiba 275-0023, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hikihara
authors.affiliation: d National Institute of Fitness and Sports in Kanoya 1 Shiromizu, Kanoya-shi, Kagoshima 891-2311, Japan.
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Masuo
authors.affiliation: e Faculty of Sport Sciences, Waseda University 2-579-15 Mikajima, Tokorozawa-shi, Saitama 359-1192, Japan.
authors.forename: Shizuo
authors.initials: S
authors.lastname: Sakamoto
authors.affiliation: e Faculty of Sport Sciences, Waseda University 2-579-15 Mikajima, Tokorozawa-shi, Saitama 359-1192, Japan.
authors.forename: Suguru
authors.initials: S
authors.lastname: Torii
authors.affiliation: e Faculty of Sport Sciences, Waseda University 2-579-15 Mikajima, Tokorozawa-shi, Saitama 359-1192, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Kawakami
authors.affiliation: d National Institute of Fitness and Sports in Kanoya 1 Shiromizu, Kanoya-shi, Kagoshima 891-2311, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Fukunaga
authors.affiliation: d National Institute of Fitness and Sports in Kanoya 1 Shiromizu, Kanoya-shi, Kagoshima 891-2311, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kanehisa
mesh_terms: D015502:Absorptiometry, Photon; D000465:Algorithms; D001823:Body Composition; D015992:Body Mass Index; D002648:Child; D002657:Child Development; D017097:Electric Impedance; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008954:Models, Biological; D024510:Muscle Development; D015596:Nutrition Assessment; D050177:Overweight / Q000000981:diagnostic imaging / Q000208:ethnology / Q000473:pathology*; D012044:Regression Analysis; D015203:Reproducibility of Results; D012574:Schools
keywords: absorptiométrie à rayons X en double énergie; bioelectrical impedance index; children; dual-energy X-ray absorptiometry; enfants; indice d’impédance bioélectrique; masse maigre segmentée; overweight; segmental fat-free mass; surpoids