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Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in severely obese Caucasian children and adolescents.
Br J Nutr. 2008 Oct; 100(4):918-24.BJ

Abstract

The objectives of the present study were to compare body composition assessed by dual-energy X-ray absorptiometry (DXA), air displacement plethysmography (ADP) and bioelectrical impedance analysis (BIA) in severely obese Caucasian children and adolescents and to develop and validate new equations for predicting body composition from BIA using DXA as the reference method. Body composition was assessed in fifty-eight obese children and adolescents (BMI 34.4 (SD 4.9) kg/m(2)) aged 10-17 years by DXA, ADP and BIA. ADP body fat content was estimated from body density using equations devised by Siri (ADP(Siri)) and Lohman (ADP(Lohman)). In the whole sample, the Bland-Altman test showed that ADP(Siri) and ADP(Lohman) underestimated percentage fat mass (%FM) by 2.1 (SD 3.4) and by 3.8 (SD 3.3) percent units (P<0.001), respectively, compared to DXA. In addition, compared to DXA, BIA underestimated %FM by 5.8 (SD 4.6) percent units in the whole group (P<0.001). A new prediction equation (FFM (kg) = 0.87 x (stature(2)/body impedance) + 3.1) was developed on the pooled sample and cross-validated on an external group of sixty-one obese children and adolescents. The difference between predicted and measured FFM in the external group was -1.6 (SD 2.9) kg (P<0.001) and FFM was predicted accurately (error < 5%) in 75% of subjects. In conclusion, DXA, ADP and the BIA are not interchangeable for the assessment of %FM in severely obese children and adolescents. The new prediction equation offers an alternative approach to DXA for the estimation of body composition in severely obese children and adolescents.

Authors+Show Affiliations

Istituto Auxologico Italiano, IRCCS, Laboratorio Sperimentale Ricerche, Auxo-endocrinologiche, Verbania, Italia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18279552

Citation

Lazzer, Stefano, et al. "Comparison of Dual-energy X-ray Absorptiometry, Air Displacement Plethysmography and Bioelectrical Impedance Analysis for the Assessment of Body Composition in Severely Obese Caucasian Children and Adolescents." The British Journal of Nutrition, vol. 100, no. 4, 2008, pp. 918-24.
Lazzer S, Bedogni G, Agosti F, et al. Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in severely obese Caucasian children and adolescents. Br J Nutr. 2008;100(4):918-24.
Lazzer, S., Bedogni, G., Agosti, F., De Col, A., Mornati, D., & Sartorio, A. (2008). Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in severely obese Caucasian children and adolescents. The British Journal of Nutrition, 100(4), 918-24. https://doi.org/10.1017/S0007114508922558
Lazzer S, et al. Comparison of Dual-energy X-ray Absorptiometry, Air Displacement Plethysmography and Bioelectrical Impedance Analysis for the Assessment of Body Composition in Severely Obese Caucasian Children and Adolescents. Br J Nutr. 2008;100(4):918-24. PubMed PMID: 18279552.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of dual-energy X-ray absorptiometry, air displacement plethysmography and bioelectrical impedance analysis for the assessment of body composition in severely obese Caucasian children and adolescents. AU - Lazzer,Stefano, AU - Bedogni,Giorgio, AU - Agosti,Fiorenza, AU - De Col,Alessandra, AU - Mornati,Daniela, AU - Sartorio,Alessandro, Y1 - 2008/02/18/ PY - 2008/2/19/pubmed PY - 2009/5/14/medline PY - 2008/2/19/entrez SP - 918 EP - 24 JF - The British journal of nutrition JO - Br. J. Nutr. VL - 100 IS - 4 N2 - The objectives of the present study were to compare body composition assessed by dual-energy X-ray absorptiometry (DXA), air displacement plethysmography (ADP) and bioelectrical impedance analysis (BIA) in severely obese Caucasian children and adolescents and to develop and validate new equations for predicting body composition from BIA using DXA as the reference method. Body composition was assessed in fifty-eight obese children and adolescents (BMI 34.4 (SD 4.9) kg/m(2)) aged 10-17 years by DXA, ADP and BIA. ADP body fat content was estimated from body density using equations devised by Siri (ADP(Siri)) and Lohman (ADP(Lohman)). In the whole sample, the Bland-Altman test showed that ADP(Siri) and ADP(Lohman) underestimated percentage fat mass (%FM) by 2.1 (SD 3.4) and by 3.8 (SD 3.3) percent units (P<0.001), respectively, compared to DXA. In addition, compared to DXA, BIA underestimated %FM by 5.8 (SD 4.6) percent units in the whole group (P<0.001). A new prediction equation (FFM (kg) = 0.87 x (stature(2)/body impedance) + 3.1) was developed on the pooled sample and cross-validated on an external group of sixty-one obese children and adolescents. The difference between predicted and measured FFM in the external group was -1.6 (SD 2.9) kg (P<0.001) and FFM was predicted accurately (error < 5%) in 75% of subjects. In conclusion, DXA, ADP and the BIA are not interchangeable for the assessment of %FM in severely obese children and adolescents. The new prediction equation offers an alternative approach to DXA for the estimation of body composition in severely obese children and adolescents. SN - 1475-2662 UR - https://www.unboundmedicine.com/medline/citation/18279552/Comparison_of_dual_energy_X_ray_absorptiometry_air_displacement_plethysmography_and_bioelectrical_impedance_analysis_for_the_assessment_of_body_composition_in_severely_obese_Caucasian_children_and_adolescents_ L2 - https://www.cambridge.org/core/product/identifier/S0007114508922558/type/journal_article DB - PRIME DP - Unbound Medicine ER -