Semi-longitudinal study of sex hormone on boys with different body composition aged 8 to 12

  Objective   To study the trend and difference of the salivary testosterone and estradiol levels in boys with different body composition on early puberty.

  Methods   One hundred and twenty-nine boys aged 8 and 10 were divided into three groups including obese group, moderate group and thin group and observed three years to determine their body composition and salivary testosterone and estradiol levels.

  Results   The body fat and lean body mass in three groups increased with their age and the same to the salivary testosterone and estradiol levels.Their testosterone and estradiol levels were correlated positively with lean body mass and body fat.The ratios of testoterone and estradiol were mild negative corrleation with body fat ratio.

  Conclusion   Boys with different body composition had different sex hormone levels.