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Body composition estimates from multicomponent models using BIA to determine body water
E M Evans1, S A Arngrimsson, K J Cureton
1Department of Exercise Science, University of Georgia, Athens, GA 30602-6554, USA. eevans@im.wustl.edu
Medicine and Science in Sports and Exercise
|April 27, 2001
Summary
Estimates of body fat percentage using bioelectrical impedance analysis (BIA) in multi-component models are not accurate enough to replace criterion methods like deuterium dilution (D2O). These BIA-derived body fat estimates are comparable to simpler two-component models but not ideal substitutes.
Area of Science:
- Human Physiology
- Body Composition Analysis
- Biomedical Engineering
Background:
- Accurate body fat percentage (%BF) estimation is crucial for health assessment.
- Multi-component models offer more detailed body composition analysis than two-component models.
- Bioelectrical impedance analysis (BIA) is a common, non-invasive method for estimating total body water (TBW) and body fat.
Purpose of the Study:
- To compare body fat (%BF) estimates derived from three- and four-component models using BIA-determined TBW against criterion methods.
- To evaluate the accuracy of %BF estimates from single-frequency BIA against densitometry and deuterium dilution (D2O) methods.
Main Methods:
- Body density was measured using hydrostatic weighing.
- Total body water (TBW) was determined by both single-frequency BIA and deuterium dilution (D2O).
- Body fat percentage (%BF) was calculated using two-, three-, and four-component models, incorporating BIA and D2O measurements.
Main Results:
- A strong correlation and no significant difference were found between TBW estimated by BIA and D2O.
- Estimates of %BF from three- and four-component models using BIA showed strong correlations with criterion methods.
- However, the accuracy of BIA-derived %BF in multi-component models was comparable to, or slightly worse than, the two-component densitometry model.
Conclusions:
- Multi-component models using BIA-derived TBW are not more accurate than the two-component densitometry model for estimating %BF.
- Therefore, %BF estimates from multi-component models utilizing BIA-determined TBW are not acceptable substitutes for those using criterion TBW methods like D2O.