The association of obesity and hyperandrogenemia during the pubertal transition in girls: obesity as a potential factor in the genesis of postpubertal hyperandrogenism.

CONTEXT

Adolescent hyperandrogenemia is considered a forerunner of adult polycystic ovary syndrome, but its etiology remains uncertain.

OBJECTIVE

Our objective was to explore the hypothesis that peripubertal obesity is associated with hyperandrogenemia.

DESIGN AND SETTING

We performed a cross-sectional analysis of data obtained at General Clinical Research Centers.

SUBJECTS

Subjects were 41 obese [body mass index (BMI) for age, >or=95%] and 35 normal-weight (BMI for age, <95%) peripubertal girls.

INTERVENTION

We used pooled blood samples (approximately 0500-0700 h; n = 64) while fasting or single morning (fasting) samples (n = 12).

MAIN OUTCOME MEASURES

We assessed adiposity and androgen concentrations.

RESULTS

BMI correlated with total testosterone (T) (r(s) = 0.59), SHBG (r(s) = -0.69), and free T (r(s) = 0.69); free T was three times as great in obese girls compared with normal-weight girls (P < 0.0001 for all). BMI correlated with insulin (r(s) = 0.52); both insulin and LH correlated with free T (r(s) = 0.45 and 0.44, respectively; P < 0.001 for all). When analyzing early pubertal girls (pubertal stages 1-3; n = 36) alone, BMI correlated with total T (r(s) = 0.65), SHBG (r(s) = -0.74), and free T (r(s) = 0.75); free T was five times as great in obese early-pubertal girls (P < 0.001 for all). BMI correlated with insulin (r(s) = 0.65), and insulin correlated with free T (r(s) = 0.63, P < 0.01 for both). BMI correlated with free T while simultaneously adjusting for age, pubertal stage, insulin, LH, and dehydroepiandrosterone sulfate.

CONCLUSION

Peripubertal obesity is associated with marked hyperandrogenemia, which is especially pronounced in early puberty.