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Open AccessArticle

The Two-Component Model for Calculating Total Body Fat from Body Density: An Evaluation in Healthy Women before, during and after Pregnancy

1
Department of Clinical and Experimental Medicine, Linköping University, SE 581 85 Linköping, Sweden
2
Department of Biosciences and Nutrition, Karolinska Institute, NOVUM, SE 141 83 Huddinge, Sweden
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Author to whom correspondence should be addressed.
Nutrients 2014, 6(12), 5888-5899; https://doi.org/10.3390/nu6125888
Received: 30 October 2014 / Revised: 26 November 2014 / Accepted: 1 December 2014 / Published: 17 December 2014
(This article belongs to the Special Issue Nutrition in Pregnancy)
A possibility to assess body composition during pregnancy is often important. Estimating body density (DB) and use the two-component model (2CM) to calculate total body fat (TBF) represents an option. However, this approach has been insufficiently evaluated during pregnancy. We evaluated the 2CM, and estimated fat-free mass (FFM) density and variability in 17 healthy women before pregnancy, in gestational weeks 14 and 32, and 2 weeks postpartum based on DB (underwater weighing), total body water (deuterium dilution) and body weight, assessed on these four occasions. TBF, calculated using the 2CM and published FFM density (TBF2CM), was compared to reference estimates obtained using the three-component model (TBF3CM). TBF2CM minus TBF3CM (mean ± 2SD) was −1.63 ± 5.67 (p = 0.031), −1.39 ± 7.75 (p = 0.16), −0.38 ± 4.44 (p = 0.49) and −1.39 ± 5.22 (p = 0.043) % before pregnancy, in gestational weeks 14 and 32 and 2 weeks postpartum, respectively. The effect of pregnancy on the variability of FFM density was larger in gestational week 14 than in gestational week 32. The 2CM, based on DB and published FFM density, assessed body composition as accurately in gestational week 32 as in non-pregnant adults. Corresponding values in gestational week 14 were slightly less accurate than those obtained before pregnancy. View Full-Text
Keywords: before pregnancy; body composition; fat-free mass density; gestation; postpartum; total body fat before pregnancy; body composition; fat-free mass density; gestation; postpartum; total body fat
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Forsum, E.; Henriksson, P.; Löf, M. The Two-Component Model for Calculating Total Body Fat from Body Density: An Evaluation in Healthy Women before, during and after Pregnancy. Nutrients 2014, 6, 5888-5899.

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