The Importance of Hydration in Body Composition Assessment in Children Aged 6-16 Years.

Autor: Watson LPE; National Institute Health Research Cambridge Clinical Research Facility, Addenbrooke's Hospital, Cambridge, United Kingdom. Electronic address: lpew2@medschl.cam.ac.uk., Carr KS; National Institute Health Research Cambridge Clinical Research Facility, Addenbrooke's Hospital, Cambridge, United Kingdom., Orford ER; Stable Isotope Laboratory, National Institute for Health Research Cambridge Biomedical Research Centre Nutritional Biomarker Laboratory, MRC Epidemiology Unit and Wellcome-MRC Institute of Metabolic Science, Metabolic Research Laboratories, University of Cambridge, Cambridge, United Kingdom., Venables MC; Stable Isotope Laboratory, National Institute for Health Research Cambridge Biomedical Research Centre Nutritional Biomarker Laboratory, MRC Epidemiology Unit and Wellcome-MRC Institute of Metabolic Science, Metabolic Research Laboratories, University of Cambridge, Cambridge, United Kingdom.
Jazyk: angličtina
Zdroj: Journal of clinical densitometry : the official journal of the International Society for Clinical Densitometry [J Clin Densitom] 2021 Jul-Sep; Vol. 24 (3), pp. 481-489. Date of Electronic Publication: 2020 Dec 15.
DOI: 10.1016/j.jocd.2020.12.004
Abstrakt: Body composition is associated with many noncommunicable diseases. The accuracy of many simple techniques used for the assessment of body composition is influenced by the fact that they do not take into account tissue hydration and this can be particularly problematic in paediatric populations. The aims of this study were: (1) to assess the agreement of two dual energy X-ray absorptiometry (DXA) systems for determining total and regional (arms, legs, trunk) fat, lean, and bone mass and (2) to compare lean soft tissue (LST) hydration correction methods in children. One hundred and twenty four healthy children aged between 6 and 16 years old underwent DXA scans using 2 GE healthcare Lunar systems (iDXA and Prodigy). Tissue hydration was either calculated by dividing total body water (TBW), by 4-component model derived fat free mass (HFFM TBW ) or by using the age and sex specific coefficients of Lohman, 1986 (HFFM Lohman ) and used to correct LST. Regression analysis was performed to develop cross-calibration equations between DXA systems and a paired samples t-test was conducted to assess the difference between LST hydration correction methods. iDXA resulted in significantly lower estimates of total and regional fat and lean mass, compared to Prodigy. HFFM TBW showed a much larger age/sex related variability than HFFM Lohman . A 2.0 % difference in LST was observed in the boys (34.5 kg vs 33.8 kg respectively, p < 0.05) and a 2.5% difference in the girls (28.2 kg vs 27.5 kg respectively, p < 0.05) when corrected using either HFFM TBW or HFFM Lohman. Care needs to be exercised when combining data from iDXA and Prodigy, as total and regional estimates of body composition can differ significantly. Furthermore, tissue hydration should be taken into account when assessing body composition as it can vary considerably within a healthy paediatric population even within specific age and/or sex groups.
(Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE