Sex Hormone–Binding Globulin Levels Predict Insulin Sensitivity, Disposition Index, and Cardiovascular Risk During Puberty

  1. Kaspar Sørensen, MD1,
  2. Lise Aksglaede, MD1,
  3. Thor Munch-Andersen2,
  4. Niels Jacob Aachmann-Andersen2,
  5. Joergen Holm Petersen, PHD1,3,
  6. Linda Hilsted, MD, DMSC4,
  7. Jørn Wulff Helge, PHD5 and
  8. Anders Juul, MD, DMSC1
  1. 1Department of Growth and Reproduction, Copenhagen University Hospital, Copenhagen, Denmark;
  2. 2Copenhagen Muscle Research Centre, Copenhagen University Hospital, University of Copenhagen, Copenhagen, Denmark;
  3. 3Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark;
  4. 4Department of Clinical Biochemistry, Copenhagen University Hospital, Copenhagen, Denmark;
  5. 5Copenhagen Muscle Research Centre, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.
  1. Corresponding author: Kaspar Sørensen, kaspar.soerensen{at}rh.regionh.dk.

Abstract

OBJECTIVE Early puberty is associated with increased risk of subsequent cardiovascular disease. Low sex hormone–binding globulin (SHBG) levels are a feature of early puberty and of conditions associated with increased cardiovascular risk. The aim of the present study was to evaluate SHBG as a predictor of glucose metabolism and metabolic risk during puberty.

RESEARCH DESIGN AND METHODS This was a cross-sectional study on 132 healthy Caucasian children and adolescents evaluated by an oral glucose tolerance test, a dual-energy X-ray absorptiometry scan, direct oxygen uptake measurement during cycle ergometry, and fasting blood samples.

RESULTS SHBG levels declined with advancement of puberty in both boys (P < 0.001) and girls (P = 0.019). SHBG was significantly positively associated with insulin sensitivity in boys (P < 0.001) and girls (P < 0.001). In addition, SHBG was a strong predictor of insulin sensitivity (P = 0.001) and the only predictor of the disposition index (P = 0.031) after adjustment for puberty, fat mass, and aerobic fitness. SHBG was significantly negatively associated with metabolic risk (P = 0.032) and with hypersensitive C-reactive protein levels (P = 0.030) after adjustment for relevant confounders.

CONCLUSIONS SHBG was a strong predictor of insulin sensitivity and metabolic risk during puberty. Thus, we hypothesize that SHBG integrates the marked changes in glucose metabolism and body composition that occur during the pubertal transition.

Footnotes

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Received September 3, 2008.
    • Accepted January 28, 2009.
  • Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0/ for details.

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  1. Diabetes Care vol. 32 no. 5 909-914
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