Sciences Journal Of Physical Education

Abstract:
The study aimed to identify the values of the biomechanical variables of the four stages (approach, rise, hitting, landing) in the skillful performance of the wavy serving skill of jumping by volleyball.
The researchers used the descriptive approach in the method of associative relations which is appropriate to the nature of the research problem. The researchers identified the research community and they are players of Al-Rumaitha sports club volleyball team (10) players were given to each player three attempts, to have (30) views are subjected to analysis and the best score was chosen. The test was shown to a group of experts. As for the biomechanical variables, the researchers used a camera type (CASIO) with a frequency speed of 300 images / s to extract the biomechanical variables. The researchers used kinovea (0.8.24) kinetic analysis program to extract the values of the biomechanical variables. The most important conclusions are that the distance of the implementation of the transmission in the first stage until the stage of ascension greatly affect the degree of perfect angles of the joints that allow to take the good technical situation, the more appropriate angles whenever the shape of motor in the best case. , And the increase in the degree of knee joint leads to increase the starting angle and maximum flexion of the trunk arc and the height of the hip point at the moment of hitting the ball.