title: Adolescent testosterone, muscle mass and glucose metabolism: evidence from the 'Children of 1997' birth cohort in Hong Kong.
abstract: OBJECTIVE
  Diabetes rates are high in Asia despite relatively low rates of obesity, which might be related to lower muscle mass. Muscle mass plays an important role in glucose metabolism. Peak muscle mass is obtained in late adolescence. We tested the hypothesis that pubertal testosterone is negatively associated with glucose metabolism mediated by muscle mass.
  
  
  METHODS
  Participants aged 15 years (278 boys and 223 girls) were recruited from the Hong Kong's 'Children of 1997' birth cohort in 2012. Multivariable linear regression with multiple imputation and inverse probability weighting was used to examine the adjusted associations of pubertal testosterone with skeletal muscle index, body fat percentage, fasting glucose, insulin and homeostasis model of assessment - insulin resistance.
  
  
  RESULTS
  Total testosterone was negatively associated with fasting glucose (-0.008, 95% confidence interval -0.015 to -0.002), insulin (-0.43, 95% confidence interval -0.56 to -0.30) and insulin and homeostasis model of assessment - insulin resistance (-0.09, 95% confidence interval -0.12 to -0.06) adjusted for sex, birth weight, highest parental education, mother's place of birth and physical activity. These associations were attenuated by additional adjustment for skeletal mass index or body fat percentage.
  
  
  CONCLUSIONS
  Adolescent glucose metabolism may be influenced by testosterone, perhaps partially via skeletal muscle mass.
authors.affiliation: School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
authors.forename: W W
authors.initials: WW
authors.lastname: Hou
authors.forename: M A
authors.initials: MA
authors.lastname: Tse
authors.forename: T H
authors.initials: TH
authors.lastname: Lam
authors.forename: G M
authors.initials: GM
authors.lastname: Leung
authors.forename: C M
authors.initials: CM
authors.lastname: Schooling
mesh_terms: D000293:Adolescent; D001786:Blood Glucose / Q000378:metabolism*; D015331:Cohort Studies; D005215:Fasting / Q000378:metabolism; D005260:Female; D006723:Hong Kong; D006801:Humans; D007328:Insulin / Q000378:metabolism; D007333:Insulin Resistance / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D011627:Puberty / Q000378:metabolism; D012727:Sex Characteristics; D013739:Testosterone / Q000378:metabolism*
chemical_list: D001786:Blood Glucose; D007328:Insulin; D013739:Testosterone