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Validation of dual energy x-ray absorbtiometry and foot-foot impedance against deutrium dilution measures of aftness in children

Reilly, John J and Garasimidis, K and Papararcleous, N and Sherriff, A. and Carmichael, A. and Ness, AR and Wells, J.C. (2010) Validation of dual energy x-ray absorbtiometry and foot-foot impedance against deutrium dilution measures of aftness in children. International Journal of Pediatric Obesity, 5 (1). pp. 111-115. ISSN 1747-7166

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Abstract

To determine the validity of estimation of body fatness by dual-energy x-ray absorptiometry (DXA) and foot-foot bio-electrical impedance (BIA). In 176, 11-12-year-olds (84 boys; 92 girls) body fatness was measured using total body water (TBW), derived from deuterium oxide dilution space. Body fatness was also estimated from DXA and BIA. Methods were compared by regression and by Bland-Altman analysis using TBW measures as the reference. In boys, mean fat mass from TBW was 9.8 kg (standard deviation, SD=6.1); bias by DXA estimated fat mass was +0.9 kg (limits of agreement -2.2 to +4.1) and bias for BIA was -5.2 kg (limits of agreement +0.5 to -10.8). In boys, regression analysis indicated significant differences in slope (p<0.001) for DXA, and both slope (p < 0.001) and intercept (p < 0.001) for BIA. In girls, mean fat mass from TBW was 12.1 kg (SD 7.7); bias for DXA was +1.2 kg (limits of agreement -1.9 to +5.1) and bias for BIA was -0.2 kg (limits of agreement -5.4 to +5.1). In girls, regression analysis indicated significant differences for slope and intercept (p<0.001 in all cases) for both DXA and BIA. Errors in estimation of fat mass using BIA and DXA can be very large, and the direction of error can differ between the sexes.

Item type: Article
ID code: 33173
Keywords: physical activity, exercise, healthy lifestyle, child health, body fat, Child Health. Child health services, Pediatrics, Perinatology, and Child Health, Public Health, Environmental and Occupational Health, Health Policy, Nutrition and Dietetics
Subjects: Medicine > Pediatrics > Child Health. Child health services
Department: Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Physical Activity for Health
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    Depositing user: Pure Administrator
    Date Deposited: 13 Sep 2011 12:04
    Last modified: 05 Sep 2014 10:38
    URI: http://strathprints.strath.ac.uk/id/eprint/33173

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