الفهرس 
Effect of plyometric training on performance and incidence of injury in volleyball
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Abstract
Introduction: Volleyball is one of the most popular sports in the world, volleyball is a non-contact game, where players from the opposing teams are separated by the net, it may be expected that the incidence of injuries is low. However, studies have indicated that injuries in volleyball are quite frequent. The purpose: Of this study was to assess the effect of plyometric training on performance and incidence of injury in volley ball players, thirty male volley ball players were selected and divided randomly into two equal groups. Patients and methods: Thirty male volleyball players playing, divided randomly into two equal groups (A and B) each was composed of fifteen players. group (A) study group: This group received four practical trainings (running for 20 minutes, hopping for 15 minutes, jogging for 15 minutes and specific volley ball activities for 30 minutes) and two gymnastic workout trainings sessions a week in addition to plyometric exercises practiced twice a week for six weeks. group (B) control group: this group received four practical trainings (running for 20 minutes, hopping for 15 minutes, jogging for 15 minutes and specific volley ball activities for 30 minutes) and two gym workout trainings sessions a week without plyometric training. All players in both groups(A and B) were assessed before and after training by using backward overhead medicine ball throw test, 1-RM Leg press test, Vertical jump test and Rate of incidence of injury