Ethnicity, Smoking and Body Composition Influence Testosterone and Estradiol Levels in Healthy Young Adult Men in Malaysia: A Pilot Study

AUTHORS

Kok Yong Chin 1 , Ima Nirwana Soelaiman 2 , * , Isa Naina Mohamed 1 , Hanapi Johari 1 , Wan Zurinah Wan Ngah 1

1 Pharmacology Department, Faculty of Medicine, Universiti Kebangsaan Malaysia, Malaysia

2 Pharmacology Department, Faculty of Medicine, Universiti Kebangsaan Malaysia, [email protected], Malaysia

How to Cite: Chin K, Soelaiman I, Mohamed I, Johari H, Wan Ngah W. Ethnicity, Smoking and Body Composition Influence Testosterone and Estradiol Levels in Healthy Young Adult Men in Malaysia: A Pilot Study, Int J Endocrinol Metab. Online ahead of Print ; 10(1):404-410. doi: 10.5812/ijem.3937.

ARTICLE INFORMATION

International Journal of Endocrinology and Metabolism: 10 (1); 404-410
Article Type: Original Article
Received: November 28, 2011
Accepted: January 1, 2012
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Abstract

Background: Variations in sex hormone levels can be caused by differences in ethnicity, smoking habits, and body composition and may be related to racial differences in the prevalence of certain diseases.
Objectives: This study examined the effects of ethnicity, smoking, and body composition on testosterone and estradiol levels in a group of young Malaysian men.
Materials and Methods: In this cross-sectional study, 189 Malay and Chinese men aged 20-39 years answered a detailed questionnaire, underwent body anthropometric measurements, and had their blood drawn for hormone assays.
Results: The results indicated no differences in testosterone levels between races (P>0.05), but estradiol levels were significantly higher among Malay compared with Chinese men (P<0.05). No difference was detected in sex hormone levels between smokers and non-smokers (P>0.05). However, smokers with more than 10 years of cigarette smoke exposure had a significantly higher estradiol level than smokers with 1-5 years of exposure (P<0.05). Testosterone (total, free, and non-SHBG-bound) levels correlated inversely and significantly (P<0.05) with body mass index (BMI), waist-to-hip circumference ratio (WHR), and percentage of body fat. By multiple stepwise regression, body fat percentage was the most influential predictor of testosterone (β=-0.456 for total, β=-0.279 for free, β= -0.297 for non-SHBG-bound fraction) and SHBG levels (β=-0.172).
Conclusions: Estradiol levels are influenced by ethnicity and duration of smoking, whereas testosterone levels are governed by body fat percentage in Malaysian young adult males.

 


 

  • Implication for health policy/practice/research/medical education:

The factors that influence sex hormone levels suggested in this study may explain the differences in the prevalence of disease in populations with distinct demographics and behavior. It also suggests possible areas for behavior modification in order to prevent sex hormone dependent diseases from developing.

  • Please cite this paper as:

Chin KY, Soelaiman IN, Mohamed IN, Joharj H, Wan Ngah WZ. Ethnicity, Smoking and Body Composition Influence Testosterone and Estradiol Levels in Healthy Young Adult Men in Malaysia: A Pilot Study. Int J Endocrinol Metab. 2012; 10(1): 404-10. DOI: 10.5812/ijem.3937
                                                                                    Copyright © 2012 Kowsar M. P. Co. All rights reserved.

 


Keywords

Sex Hormones Testosterone Estradiol Smoking Body Composition

© 0, International Journal of Endocrinology and Metabolism. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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