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Body size and composition in Polynesians.
B A Swinburn1, S J Ley, H E Carmichael
1Department of Community Health, University of Auckland, Auckland, New Zealand. b.swinburn@auckland.ac.nz
Summary
Polynesians have a leaner body composition than Europeans at higher body mass index levels. Specific regression equations using bioelectrical impedance analysis and skinfold measurements accurately predict body composition in Polynesians.
Area of Science:
- Anthropometry
- Human Physiology
- Body Composition Analysis
Background:
- Understanding body composition differences between ethnic groups is crucial for accurate health assessments.
- Existing body mass index (BMI) definitions may not be universally applicable across diverse populations.
Purpose of the Study:
- To compare body size and composition relationships in New Zealand Polynesians and Europeans.
- To develop and validate specific regression equations for estimating fat mass in Polynesian populations.
Main Methods:
- Study included 189 Maori, 185 Samoans, and 241 Europeans (aged 20-70 years).
- Measurements included height, weight, skinfold thicknesses, bioelectrical impedance analysis (BIA), and dual-energy X-ray absorptiometry (DXA).
Main Results:
- Polynesians exhibited a higher lean mass to fat mass ratio than Europeans at elevated BMI levels.
- Four regression equations were developed using BIA, height, weight, and skinfold data to predict fat mass in Polynesians.
- These equations demonstrated high predictive accuracy (r² range 0.89-0.93) with minimal prediction error.
Conclusions:
- Polynesians are leaner than Europeans at higher BMIs, suggesting a need for distinct overweight and obesity classifications.
- Developed regression equations provide reliable methods for assessing Polynesian body composition.