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Related Experiment Videos

Fat mass deposition during pregnancy using a four-component model.

L E Kopp-Hoolihan1, M D van Loan, W W Wong

  • 1Department of Nutritional Sciences, University of California, Berkeley, California 94720, USA. hoolihan@dairycouncilofca.org

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 20, 1999
PubMed
Summary

Estimating body fat gained during pregnancy is crucial for understanding reproductive energy needs. This study found significant individual variability in gestational weight composition, making a single energy cost estimate impossible.

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Area of Science:

  • Human Physiology
  • Reproductive Health
  • Body Composition Analysis

Background:

  • Accurate assessment of gestational weight gain composition is vital for understanding maternal and fetal health.
  • Existing body composition measurement methods are often invalid during pregnancy.
  • Quantifying fat mass changes during pregnancy informs reproductive energy requirement studies.

Purpose of the Study:

  • To apply a four-component model to measure body fat gained during human pregnancy.
  • To assess the variability in body composition changes throughout gestation.
  • To determine the energy cost associated with fat deposition during pregnancy.

Main Methods:

  • Longitudinal measurements of total body water (TBW) via deuterium dilution, body density via hydrodensitometry, and bone mineral content (BMC) via dual-energy X-ray absorptiometry.

Related Experiment Videos

  • Application of a four-component model to estimate body fat and fat-free mass.
  • Measurements taken from pre-conception through postpartum (4-6 weeks).

    • Main Results:

    • By 36 weeks gestation, average increases included: body weight (11.2 kg), TBW (5.6 kg), fat-free mass (6.5 kg), and fat mass (4.1 kg).
    • The estimated energy cost of fat mass gained averaged 44,608 kcal, with a wide 95% confidence interval.
    • Significant individual variability in gestational weight composition was observed, unrelated to prepregnancy body composition or energy intake.

    Conclusions:

    • The composition of gestational weight gain, particularly fat mass deposition, exhibits substantial inter-individual variability.
    • This variability precludes the establishment of a single, universal energy cost value for fat deposition during pregnancy.
    • Further research is needed to understand the factors driving this variability and refine energy requirement estimations for pregnancy.