The purpose of this study was to investigate the interference effect of concurrent strength and endurance training on maximum strength and VO2 max in nonathlete. For this purpose 34 sedentary healthy men, with mean of age: 22±1/18 year's old, height: 173/61±6/48 cm and weight: 65/13±8/50 kg, voluntarily participated in this study. Initially, subjects were randomly assigned to one of four training groups; strength (n=8), endurance (n=10), concurrent (n=8) and control (n=8). Endurance group performed bumpa interval endurance training program for 6 weeks (3days/w, 12:30-25min, 50-70% HRR), strength group performed resistance program for 6 weeks (3days/w, 6 exercises/ 3set, 75-85% 1-RM), and combined group performed combination of strength and endurance training for 6 weeks. Control group did not participate in any of the above. All subjects performed VO2max (Bruce test) and maximum strength (mechanical lift) tests before and after of the training program. One–way ANOVA was applied for examining the hypothesizes. The result of statistical analysis showed that there is no significant difference on VO2 max between concurrent (16%) versus endurance (18%)(p = 0/95) and on maximum strength between concurrent (31%) versus strength (39%)(p = 0/31). Conclusion: concurrent strength and endurance training did not interfere with maximum strength and VO2 max development in comparison to strength and endurance training.
