Introduction and purpose: warming up is one of the principles of training. Athletes have alwaysattempted to achieve success and improve their performance during a competition or a trainingsession. Therefore, proper warm-up before training and competition can help athletes to achievetheir best performance. In modern training methods, before performing explosive activities, theyperform resistance exercises that are biomechanically similar to skills. One of the methods isknown as Post-Activation Potentiation (PAP). However, performing PAP usually requires specialequipment. Therefore, coaches and trainers are looking to execute PAP using simple methods.Therefore, this research aims to compare the eff ect of traditional warm-up with two PAP protocols(plyometric with and without blood fl ow restriction) on some performance factors of volleyballplayers. Materials and methods: The subjects of this research were 13 volleyball players with an age rangeof 21 to 26 years. Subjects performed one of the three warm-up protocols consisting of traditionalwarm-up protocol (TRD), plyometric exercises (PLY), and plyometric exercises with blood fl owrestriction (PLY+BFR) in 6 diff erent sessions in a random cross-over manner. After four minutes ofeach protocol, the vertical jump and agility T-test was taken in the fi rst three sessions and Wingateanaerobic test in the second three sessions. Statistical methods of analysis of variance with repeated measurements and Bonferroni post hoctest were used to determine the presence of a signifi cant diff erence (P<0.05). Findings: A signifi cant diff erence was observed in the explosive power, anaerobic power, andagility of the athletes between diff erent warm-up protocols. The results showed that the PLY wasable to show a greater improvement than other two protocols in the athletes\\\' performance. Conclusion: It is suggested to use plyometric exercise to improve the performance of explosivepower, anaerobic power (average power), and agility of volleyball players before training ormatches.

Keywords