One of the main goals of exercise training is to improve adaptations and performance in the training. There are more kinds of exercises that effect to the physical fitness. The influences of resistance and endurance training, depend of the type of diet provided, resistance training results in a positive energy balance, hypertrophy and strength gains. The goal of this study was to investigate the effect of simultaneous strength and endurance training on the ratio of testosterone to cortisol in young untrained males. This study was performed on 24 untrained males who were divided into strength, endurance and concurrent groups. Each group had an equal number of subjects (n=8) and were studied during a time course of 12 weeks. Blood samples were drawn from the left brachial vessel at 0, 6 and 12 weeks to determine the total and free concentrations of testosterone and cortisol system and muscular performance.
