The Relationship between Range of Motion, Angular Velocity, Shearing Force and Reaction Force of Lower Extremity of Jump Serve in Male Volleyball Players

Document Type : Research Paper


PhD student of sport biomechanics, Physical education faculty. Kharazmi University


Background and aim: Volleyball is one of the most popular sports in the world and knee injury is a common occurrence in volleyball. The purpose of this study was the relationship between range of motion, angular velocity, shearing force and reaction force of lower extremity of jump serve in male volleyball players.
Materials and methods: The study samples consisted of 15 healthy male volleyball players which performed jump serve skill. All kinetics and kinematics data from ForcePlate and Motion Analysis System were used in Matlab for inverse dynamic analysis. Pearson's correlation coefficient was used to examine the relationship between the data.
Results: During volleyball jump serve, kinetic and kinematic variables correlation coefficient values​​ of  lower extremity show  negative correlation in peak knee proximal tibia anterior shear force with knee flexion angle (r = 0.111), hip flexion angle (r = 0.109), and knee flexion angular velocity (r = 0.118); and peak vertical ground reaction force with knee flexion angle (r = 0.570), and hip flexion angle (r = 529).
Conclusion: The results of this study indicate that lower extremity biomechanics of jump serve is particular important. This means ACL injuries can be prevented after recognizing of kinetics and kinematics factors. Collectively, it is suggested that athletes and coaches use the knowledge of biomechanics in sport skills for decreasing and preventing the sport injuries.