Strength training effects on physical performance and serum hormones in young soccer players

@article{Gorostiaga2003StrengthTE,
  title={Strength training effects on physical performance and serum hormones in young soccer players},
  author={Esteban M. Gorostiaga and Mikel Izquierdo and M M Linares Ruesta and Juan Iribarren and Juan Jos{\'e} Gonz{\'a}lez-Badillo and Javier Ib{\'a}{\~n}ez},
  journal={European Journal of Applied Physiology},
  year={2003},
  volume={91},
  pages={698-707}
}
To determine the effects of simultaneous explosive strength and soccer training in young men, 8 experimental (S) and 11 control (C) players, aged 17.2 (0.6) years, were tested before and after an 11-week training period with respect to the load-vertical jumping curve [loads of 0–70 kg (counter-movement jump CMJ0–70)], 5- and 15-m sprint performances, submaximal running endurance and basal serum concentrations of testosterone, free testosterone and cortisol. In the S group, the 11-week training… 
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