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Four-compartment cellular level body composition model: comparison of two approaches
Wei Shen1, Marie-Pierre St-Onge, Angelo Pietrobelli
1Obesity Research Center, St. Luke's-Roosevelt Hospital, Columbia University College of Physicians and Surgeons and Institute of Human Nutrition, Weight Control Unit, 1090 Amsterdam Avenue, 14th Floor, New York, NY 10025, USA.
Obesity Research
|March 12, 2005
Summary
Two new DXA-based models accurately estimate body cell mass (BCM) and extracellular fluid (ECF). These models offer comparable results, making them valuable tools for clinical and research settings, even with hydration variations.
Area of Science:
- Body composition analysis
- Physiological modeling
- Dual-energy X-ray absorptiometry (DXA) applications
Background:
- Accurate body composition assessment is crucial in clinical and research settings.
- Existing methods for estimating body cell mass (BCM) and extracellular fluid (ECF) have limitations.
- Cellular-level models offer a more refined understanding of body composition.
Purpose of the Study:
- To develop and compare two novel DXA-based four-compartment cellular level models.
- To evaluate the accuracy and comparability of these models for estimating BCM and ECF.
- To determine the applicability of these models in diverse populations, including those with hydration disturbances.
Main Methods:
- Development of two four-compartment models using DXA data: a total body potassium (TBK) model and a bromide dilution model.
- Estimation of body cell mass (BCM) and extracellular fluid (ECF) using established equations and measurements of osseous mineral (Mo) and lean soft tissue (LST) from DXA.
- Validation of the models in a cohort of 99 healthy men and 118 healthy women.
Main Results:
- High correlations were observed between the two models for both BCM (r=0.97) and ECF (r=0.87) estimates.
- Statistically significant but small mean differences were found between the models for BCM (1.0±2.8 kg) and ECF (1.0±2.8 kg).
- Total body water (TBW) derived from the models showed excellent agreement (Δ=0.0±2.4 kg) with measured TBW via 2H2O dilution.
Conclusions:
- Two developed four-compartment cellular level DXA models provide comparable BCM and ECF estimations.
- One of the models is suitable for broad application in clinical and research environments.
- These DXA-based models are applicable for estimating body composition in subjects with hydration disturbances.