Androgen Responses to Sprint Exercise in Young Men

The purpose of this study was to investigate the eff ects of a 6-month sprint training program on plasma androgens and catecholamine (CA) con- centrations in response to a 6 s sprint in ado- lescent boys (training group (TG), n = 6; control group (CG), n = 6). A 6 s-sprint test was performed on a cycle ergometer before and after training (Pre-T and Post-T, respectively). Plasma total testosterone (TT), bioavailable testosterone (BT), and CA concentrations were measured at rest, after a warm-up, immediately after a 6 s-sprint, and during the recovery (i. e. 5 and 20 min). After training period, plasma TT concentrations increased signifi cantly at the end of the sprint and during the recovery in the TG. No eff ects for sampling times and period were observed in BT levels. Plasma TT concentrations after 5 min of recovery were positively correlated with the corresponding values of plasma lactate (La) concentrations and with post-6 s-sprint plasma adrenaline (A) concentrations (r = 0.52; p < 0.01 and r = 0.61; p < 0.01, respectively). These results suggest that sprint training increases plasma TT concentrations in response to sprint exercise in adolescent boys. Plasma A and plasma La con- centrations increases in response to sprint exer- cise could be involved in this elevation of plasma TT concentrations.