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International Journal of Endocrinology
Volume 2012 (2012), Article ID 173581, 8 pages
http://dx.doi.org/10.1155/2012/173581
Research Article

The Effect of Puberty on Interaction between Vitamin D Status and Insulin Resistance in Obese Asian-Indian Children

1Department of Endocrinology and Metabolism, All India Institute of Medical Sciences, New Delhi 110029, India
2Department of Dietetics and Nutrition, All India Institute of Medical Sciences, New Delhi 110029, India
3Division of Endocrinology, Metabolism and Lipids, Department of Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA

Received 9 March 2012; Accepted 21 June 2012

Academic Editor: A. L. Barkan

Copyright © 2012 Rajesh Khadgawat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To study the effect of puberty on the relationship between serum 25-hydroxyvitamin D (25(OH)D) and parameters of insulin kinetics in obese Asian-Indian children. Material and Methods. The study population included 62 obese Asian-Indian children and adolescents in the age group of 6–17 years. Blood glucose, serum insulin, and serum 25(OH)D were measured. Total body fat was measured by dual energy X-ray absorptiometry. Indices of insulin resistance (HOMA-IR, AUC for insulin) and sensitivity (WBISI) were calculated after oral glucose tolerance test. Result. A total of 62 subjects (35 boys; mean age = 13.0 ± 3 years; BMI = 29.3 ± 4.8 kg/sq M; 19 subjects in Tanner stage 1, 11 in stage 2, 6 in stage 3, 3 in stage 4, and 23 subjects in Tanner stage 5) were studied. All study subjects were vitamin D deficient with a mean serum 25(OH)D of 8.5 ± 4.2 ng/mL. No significant relationship was observed between serum 25(OH)D and parameters of insulin kinetics in prepubertal children. However, a significant inverse correlation was seen between serum 25(OH)D and HOMAIR ( 𝑟 = 0 . 4 1 , 𝑃 = 0 . 0 3 ) in postpubertal subjects. Conclusion. The relationship between vitamin D status and parameters of insulin kinetics are affected by puberty.