The aim of this study was to evaluate the effect of 12 concurrent endurance Introduction: ls and sexual function indices in men over 50 resistance training on serum testosterone leve years of age. experimental study, the statistical sample consisted of -: In this quasi Material and methods /m2, kg ± 1.4 kg and body mass index of 26.4 6.7 29 men with average weight of 81.1± to two control untrained group (N = 12) and training group (N = 17). The randomly divided in resistance) for 12 weeks. -concurrent training group performed concurrent training (endurance Serum testosterone levels, cardiopulmonary endurance (VO2max), muscle strength, and body ompositions were measured before and after training. Data were analyzed using covariance c analysis (ANCOVA) (p < 0.05). Concurrent training in the training group significantly increased serum testosterone Results: roup (p = 0.001). Concurrent training also levels compared to the control untrained g eas of orgasmic performance (p = 0.010) and total score (p increased sexual function in the ar = 0.004) in the concurrent training group compared to the control untrained group. As well as ecreased fat mass (p = 0.046) and the ratio of waist to hip training significantly d circumference (p = 0.024) also significantly increased cardiorespiratory endurance (VO2max) (p = 0.001), mean relative muscle strength (p = 0.001) and lean body mass (p = 0.001) in the roup compared to the control untrained group. training g In general, based on our findings, it seems that training along with increasing Conclusions: serum testosterone levels increases sexual function in the areas of orgasm function and the 0 years. total score in men over 5 oncurrent training, elderly, erectile function c Testosterone,