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MEDICINA DELLO SPORT

A Journal on Sports Medicine


Official Journal of the Italian Sports Medicine Federation
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Medicina dello Sport 2004 June;57(2):115-20

Copyright © 2004 EDIZIONI MINERVA MEDICA

language: English

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


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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.

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