Testosterone concentrations in young pubertal and post-pubertal obese males
Article first published online: 12 MAR 2013
© 2012 Blackwell Publishing Ltd
Volume 78, Issue 4, pages 593–599, April 2013
How to Cite
Mogri, M., Dhindsa, S., Quattrin, T., Ghanim, H. and Dandona, P. (2013), Testosterone concentrations in young pubertal and post-pubertal obese males. Clinical Endocrinology, 78: 593–599. doi: 10.1111/cen.12018
- Issue published online: 12 MAR 2013
- Article first published online: 12 MAR 2013
- Accepted manuscript online: 13 SEP 2012 05:20AM EST
- Manuscript Accepted: 13 AUG 2012
- Manuscript Revised: 6 AUG 2012
- Manuscript Revised: 26 JUN 2012
- Manuscript Received: 12 JUN 2012
- NIH. Grant Number: R01 DK075877-01A2
- American Diabetes Association. Grant Number: 708CR13
- Sanofi-Aventis, Merck, Amylin
- Abbott Laboratories
- American Diabetes Association. Grant Number: 1 10 JF 13
Obesity in adult males is associated with hypogonadotropic hypogonadism. We evaluated the effect of obesity on plasma testosterone concentrations in pubertal and post-pubertal young males.
Design and methods
Morning fasting blood samples were obtained from 25 obese [body mass index (BMI) ≥95th percentile] and 25 lean (BMI <85th percentile) males between the ages 14–20 years with Tanner staging ≥4. Total (TT) and free testosterone (FT) and estradiol concentrations were measured by liquid chromatography tandem mass spectrometry and equilibrium dialysis. Free testosterone was also calculated using SHBG and albumin. C-reactive protein (CRP), insulin and glucose concentrations were measured and homoeostasis model of insulin resistance (HOMA-IR) was calculated.
After controlling for age and Tanner staging, obese males had a significantly lower total testosterone (10·5 vs 21·44 nmol/l), free testosterone (0·22 vs 0·39 nmol/l) and calculated free testosterone (0·26 vs 0·44 nmol/l) concentrations as compared to lean males (P < 0·001 for all). Obese males had higher CRP concentrations (2·8 vs 0·8 mg/l; P < 0·001), and HOMA-IR (3·8 vs 1·1; P < 0·001) than lean males. Free testosterone concentrations were positively related to age and negatively to BMI, HOMA-IR and CRP concentrations. Total and free estradiol concentrations were significantly lower in males with subnormal testosterone concentrations.
Testosterone concentrations of young obese pubertal and post-pubertal males are 40–50% lower than those with normal BMI. Obesity in young males is associated with low testosterone concentrations, which are not secondary to an increase in estradiol concentrations. Our results need to be confirmed in a larger number of subjects.