The purpose of this study was to compare anaerobic power and aerobic fitness profiles of Iranian soccer players in different playing positions during competitions season. This was a quasi-experimental research with three experimental groups. In this research 24 players of Pasargad soccer team; defenders (N=8), middles (N=8) and Attackers (N=8) were selected randomly as statistical sample. Using Astrand Treadmill Test and Running-based Anaerobic Sprint Test (RAST), aerobic fitness and anaerobic power were measured in the initial competitions season and after the 15th match during competitions season. Finally, using paired sample T Test (t-student) and ANOVA data were analyzed. Middle and attacker players showed a significant increase in aerobic fitness or VO2max (p<0.05). Furthermore, defender and attackers showed a significant increase in anaerobic power during competitions season (p<0.05). Based on the results of conducted research, anaerobic power and aerobic fitness profiles in soccer players changed during competitions season. Key Words: Aerobic Fitness, Anaerobic Power, Iranian Soccer Players. _____________________________________________________________________________________________

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