Objective: to determine the effect of Plyometric Training on Performance and Incidence of Injury in Volleyball Players. Material and Methods: Thirty male volleyball players participated in this study, their ages ranges from 15-30 years old. They were divided into two groups, (Group A) which included 15 players who received traditional training program which included four practical trainings per week (running for 20 minutes, hopping for 15 minutes, jogging for 15 minutes and specific volley ball activates for 30 minutes) plus two gymnastics workout trainings sessions a week plus plyometric exercises program practiced twice a week for six weeks, and (Group B) which included 15 players who followed a program consisted of traditional training program which included four practical trainings per week (running for 20 minutes, hopping for 15 minutes, jogging for 15 minutes and specific volley ball activates for 30 minutes) plus two gymnastics workout trainings sessions a week. Both groups were assessed pre and post-treatment by using Backward overhead medicine ball throw test, 1-RM Leg press test, Vertical jump test and Rate of incidence of injury. Results: There was a significance increase in the mean values of the Backward over head medicine ball throw test (P=0.02), Vertical jump test (p=0.01) and 1-RM Leg press test (P=0.01) of the Group A post training compared with that of Group B. While there was a significance decrease in incidence of injury in Group A compared with that of Group B (p=0.0001). There was no significance increase in the mean values of the Backward over head medicine ball throw test (P=0.45), Vertical jump test (p=0.63) and 1-RM Leg press test (P=0.48) of the Group A pre training compared with that of Group B. Conclusion: It was concluded that plyometric exercises have a significant effect on Backward overhead medicine ball throw test, 1-RM Leg press test, Vertical jump test and Rate of incidence of injury in comparison to traditional training program in volleyball players.
