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Updated: Jun 29, 2026
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Clinical Anthropometrics and Body Composition from 3-Dimensional Optical Imaging
Published on: June 7, 2024
Body circumferences: clinical implications emerging from a new geometric model
Steven B Heymsfield1, Allison Martin-Nguyen, Tung M Fong
1Merck & Company, Rahway, NJ, USA. steven_Heymsfield@merck.com.
Nutrition & Metabolism
|October 7, 2008
Summary
A new geometric model links body volume, circumferences, and body mass index (BMI), offering insights into body composition changes during weight loss. This model explains empirical observations and provides a foundation for clinical understanding.
Area of Science:
- Human anatomy and physiology
- Biomedical engineering
- Clinical research
Background:
- Obesity involves body volume expansion, measured by waist circumference and BMI.
- Existing correlations lack a unifying conceptual framework for clinical observations.
- A geometric model was developed to link body volume, circumferences, and BMI.
Purpose of the Study:
- To develop and validate a geometric model relating body volume, circumferences, and BMI.
- To apply the model to longitudinal weight loss data.
- To examine relationships between clinical measures and body composition.
Main Methods:
- Cross-sectional validation in 494 and 1499 healthy adults.
- Longitudinal evaluation using data from weight loss studies.
- Measurements included five circumferences, height, BMI, body volume (underwater weighing), and body compartment volumes (MRI).
Main Results:
- Geometric model accurately predicted body volume from circumferences and height (R2=0.97).
- Allometric models confirmed the link between circumferences and BMI (C = (V/H)^0.5).
- Waist circumference showed the largest "growth" with increased body volume, while calf showed the least.
Conclusions:
- A simple geometric model relates circumferences to body size and composition.
- The model provides a conceptual basis for empirical observations.
- New clinical insights into body composition and obesity are revealed.
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