Relationships Between Gonadotropins, Sex Hormones, and Vascular Health in Adolescents with Normal Weight or Obesity.

Objective: Relationships between gonadotropins, sex hormones, and vascular structure and function in adolescents of varying weight statuses have not been fully investigated. In the present study, we examined associations among these in female and male adolescents with normal weight or obesity. Methods: We performed a cross-sectional analysis of adolescents (n = 58; 12-<18 years) grouped according to BMI percentile (BMI%) into normal weight (5th-<85th BMI%; n = 25) and obesity (≥95th BMI%; n = 33) categories. Fasting blood samples were collected to measure follicle stimulating hormone (FSH), luteinizing hormone (LH), testosterone, and estradiol. Vascular function was measured via ultrasonography for measures of carotid artery diameter compliance (cDC), incremental elastic modulus (cIEM), and brachial artery flow mediated dilation (FMD). Results: Females with obesity had a significantly (p = 0.009) greater mean FMD compared with those with normal weight. FSH, LH, testosterone, and estradiol did not differ between normal weight and obesity groups in either sex. After adjusting for age and multiple comparisons, higher testosterone was associated with decreased cDC (R² = 0.189; p = 0.018) and increased cIEM (R² = 0.346; p = 0.002) across all females. In all males, higher estradiol was associated with decreased cDC (R² = 0.404; p = 0.006) and increased cIEM (R² = 0.411; p = 0.003). Conclusion: We found that testosterone and estradiol were associated with vascular measures in female and male adolescents, respectively. Future studies are needed to confirm these relationships in larger cohorts and among those with BMIs in the overweight (85th-<95th BMI%) and severe obesity (BMI ≥120% of the 95th percentile and/or ≥35 kg/m²) categories.