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  • Original Article
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Clinical Studies and Practice

Smaller size of high metabolic rate organs explains lower resting energy expenditure in Asian-Indian Than Chinese men

Abstract

Background:

In Singapore, the obesity prevalence is disproportionately higher in the Asian-Indians and Malays than the Chinese. Lower resting energy expenditure (REE) may be a contributory factor.

Objective:

We explored the association between ethnicity and REE in Chinese, Asian-Indian and Malay men living in Singapore and determined the influence of body composition, mass/volume of high metabolic rate organs, represented by brain volume and trunk fat-free mass (FFM), and physical activity on ethnic differences.

Design:

Two hundred and forty-four men from Singapore (n=100 Chinese, 70 Asian-Indians and 74 Malays), aged 21–40 years and body mass index of 18.5–30.0 kg m−2, were recruited in this cross-sectional study. REE was assessed by indirect calorimetry and body composition by dual-energy X-ray absorptiometry. Brain volume was measured by magnetic resonance imaging. Physical activity was assessed by the Singapore Prospective Study Program Physical Activity Questionnaire.

Results:

REE was significantly lower in Asian-Indians compared with that in Chinese after adjusting for body weight. FFM (total, trunk and limb) and total fat mass were important predictors of REE across all ethnic groups. Brain volume was positively associated with REE only in Malays. Moderate and vigorous physical activity was positively associated with REE only in Asian-Indians and Malays. The difference in REE between Asian-Indians and Chinese was attenuated but remained statistically significant after adjustment for total FFM (59±20 kcal per day), fat mass (67±20 kcal per day) and brain volume (54±22 kcal per day). The association between REE and ethnicity was no longer statistically significant after total FFM was replaced by trunk FFM (which includes heart, liver, kidney and spleen) but not when it was replaced by limb FFM (skeletal muscle).

Conclusions:

We have demonstrated a lower REE in Asian-Indians compared with Chinese who may contribute to the higher rates of obesity in the former. This difference could be accounted for by differences in metabolically active organs.

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Acknowledgements

The participation of the subjects in this study is highly appreciated. We thank Dr Paul Deurenberg for his technical assistance in the project. We also thank the Singapore Adult Metabolism Study (SAMS) team for their help in the measurements. The study was funded by a Translational and Clinical Research Flagship programme from the National Medical Research Council Singapore. Tai E Shyong and Khoo Chin Meng are also supported by Clinician Scientist Awards from the National Medical Research Council in Singapore. Peter Gluckman, Chong Yap Seng, Tai E Shyong, Lee Yung Seng, Melvin Khee-Shing Leow, Khoo Chin Meng and Khoo Yin Hao Eric were involved in project conception, development of overall research plan and study oversight. Michael Chee designed and implemented the protocols for assessing brain volume. Tammy Song aided the SAMS team in the collection of anthropometry and energy expenditure measurements and drafted the manuscript. Kavita Venkataraman and Tammy Song performed statistical analysis of data. Tai E Shyong and Khoo Yin Hao Eric had primary responsibility for final content.

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Correspondence to E Y H Khoo.

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Song, L., Venkataraman, K., Gluckman, P. et al. Smaller size of high metabolic rate organs explains lower resting energy expenditure in Asian-Indian Than Chinese men. Int J Obes 40, 633–638 (2016). https://doi.org/10.1038/ijo.2015.233

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