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A revised equation for estimating thigh muscle and bone area from anthropometric dimensions
Shigeho Tanaka1, Hitoshi Shiraki2, Nozomu Machida3
1Department of Health Education, Faculty of Education, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113, Japan.
Summary
An anthropometric equation accurately estimates thigh muscle and bone area (MBA) and fat area (FA) in Japanese male students. Refined regression models improve accuracy, showing minimal residual error for MBA estimation.
Area of Science:
- Anthropometry
- Body composition analysis
- Human physiology
Background:
- Accurate estimation of thigh muscle and bone area (MBA) and fat area (FA) is crucial for assessing body composition.
- Existing anthropometric equations may have limitations in precision.
Purpose of the Study:
- To evaluate the accuracy of an anthropometric equation for estimating thigh MBA and FA.
- To develop improved regression models for more precise estimation.
Main Methods:
- Comparison of anthropometric measurements (thigh skinfold, thigh circumference) with computed tomography (CT) scans in athletic and non-athletic Japanese male university students.
- Development and validation of linear and non-linear regression models to refine MBA estimation.
Main Results:
- The anthropometric equation showed strong correlations with actual MBA and FA but overestimated MBA and underestimated FA.
- MBA overestimation increased with larger MBA values.
- Developed regression equations demonstrated a very small mean ratio of residual to actual MBA (2.7–3.3%).
Conclusions:
- The developed anthropometric equation, particularly the refined regression model, provides accurate estimation of thigh MBA.
- This method offers a practical alternative to CT scans for body composition assessment in similar populations.
