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Background: Ethnic differences in the association between body mass index (BMI) and body fat suggest that body composition varies across ethnic groups. Objective: To investigate the association between impedance index - a measure of tissue resistivity - and BMI in adults of different ethnic groups (Asian Indians, West Africans and White Caucasians) living in their native countries. Methods: Male (n = 329) and female (n = 277) adult subjects (18-50 years) living in urban areas in the UK, The Gambia and Pakistan were studied. Body weight and height were measured and BMI calculated. The same leg-to-leg bioimpedance instrument was used in each study and impedance index (height 2 (cm)/impedance (ω)) used as measure of tissue resistivity. Results: In women, Asian Indians and West Africans had a significantly greater increase in impedance index per unit increase in BMI compared with white Caucasians (P < 0.001). In men, Asian Indians had a significantly lower impedance index compared with West Africans and white Caucasians (P < 0.001). Conclusion: Different ethnic groups may have different tissue resistivity for the same BMI indicative of systematic differences in body composition.

Original publication

DOI

10.1038/sj.ejcn.1602678

Type

Journal article

Journal

European Journal of Clinical Nutrition

Publication Date

01/11/2007

Volume

61

Pages

1337 - 1340