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Estimating body composition of young children by using bioelectrical resistance



Estimating body composition of young children by using bioelectrical resistance



Journal of Applied Physiology 75(4): 1776-1780



It is currently unclear whether age-specific equations should be used for assessing body composition from bioelectrical resistance. Kushner et al. (Am. J. Clin. Nutr. 56: 835-839, 1992) showed that the relationship between height-2/resistance and total body water (TBW) is robust across a wide age range, although uncertainty remained over the relationship in preschool children. We therefore cross-validated the Kushner equation for predicting total body water in 4- to 6-yr-old children in two independent laboratories. TBW was measured from H-2-18O dilution, and bioelectrical resistance and reactance were measured using an RJL 101A analyzer in 31 children (15 females, 16 males; 5 +- 0.8 yr) studied in Burlington, Vermont, and 30 children (14 females, 16 males; 5 +- 0.2 yr) studied in Phoenix, Arizona. There was no significant difference between TBW predicted from the Kushner equation and that measured in children in Burlington (11.76 +- 2.00 vs. 11.91 +- 2.46 kg; r = 0.94) or in Phoenix (11.53 +- 1.64 vs. 11.66 +- 1.90 kg; r = 0.94). The Kushner equation for TBW can be transformed into an equation for fat-free mass (FFM) by using published age- and gender-specific constants for the hydration of FFM: hydration of FFM = 76.9 - 0.25 age (yr) - 1.9 gender where female equals 0 and male equals 1. The intraclass reliability for estimates of fat mass and FFM with the use of bioelectrical resistance in an independent group of 26 children (5.0 +- 0.8 yr, 20.2 +- 3.0 kg) was gt 0.99 for duplicate observations performed 2 wk apart. We conclude that the relationship between TBW and height-2/resistance in young children is robust across independent laboratories and that the Kushner equation relating these two variables is viable in young children.

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Accession: 002372876

Download citation: RISBibTeXText

PMID: 8282631

DOI: 10.1152/jappl.1993.75.4.1776



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