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MEDICINA DELLO SPORT
Rivista di Medicina dello Sport
Official Journal of the Italian Sports Medicine Federation
Indexed/Abstracted in: BIOSIS Previews, EMBASE, Science Citation Index Expanded (SciSearch), Scopus
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Medicina dello Sport 2004 Giugno;57(2):115-20
Exercise-induced testosterone, growth hormone and cortisol responses at the first three stages of sexual maturation in boys
Viru A., Karelson K., Kuusler K., Janson T., Viru M.
Institute of Exercise Biology, University of Tartu, Tartu, Estonia
Aim. The purpose of the study was to investigate whether the sexual maturation influences testosterone, cortisol and growth hormone responses during 20-min ergometric aerobic exercise in boys.
Methods. The subjects were 19 healthy boys aged 10 to 13 years at the first experimental trials. After a year 15 boys and after two years 7 boys were retested again. In venous blood serum testosterone, cortisol and growth hormone concentrations serum were determined before and after 20-min ergometer exercise. These results were compared with those obtained in 50 adults (mean age 22.5±3.5 years).
Results. The sexual maturation effect on testosterone basal level did not coincide with significant differences in cortisol and growth hormone pre-exercise levels between sexual maturation stages 1, 2 and 3 (maturation stages were evaluated by the basal testosterone level) although in boys the levels of testosterone and cortisol were lower and growth hormone higher than in adults.
Conclusions. The post-exercise testosterone level increased with sexual maturation, but testosterone response (difference between pre- and post-exercise concentrations) was not significant at the first three stages of sexual maturation. Significant cortisol response appeared at stage 2. Growth hormone responses were significant in all three stages of maturation. According to MANOVA sexual maturation but not chronological age or height had significant effect on hormone responses during exercise at first three stages of sexual maturation.