THE EFFECT OF CONTROLLING THE VERTICAL AND HORIZONTAL DIMENSIONS OF THE BASE OF THE FULCRUM IN THE STAGE OF ADVANCEMENT FOR THE PERFORMANCE OF HIGHEST SPIKE IN VOLLEYBALL ON SOME BIOMECHANICAL VARIABLES
Asst. Lect . Mustafa Thabit Oudh, Prof .Dr. Yarob Abdul Baqi Daiykh
The biomechanical analysis has a very important role in raising the level of the players, as it determines whether the performance is in accordance with the biomechanical systems and foundations to employ all the players’ abilities to improve performance, which achieves a better quality of skill , The stage of advancement is the very important stage, which is no less important than the stage of flying and hitting the ball as it is the basis on which the next stages are built, The researchers noticed through experiments that the players do not pay much attention to some important variables for the stage of advancement, especially the distance between the feet, whether it is the horizontal or vertical distance, which may occur due to the rush with quick approximate steps or the lack of appropriate balance, which makes the player where to grow from the base of the fulcrum For both sides, and this in itself is a mistake that results in restoring part of the inertia of the body, especially if we take into account that these distances increase the time of rise and dissipate the forces that it produces, The study aimed to identify the differences in the values of some biomechanical variables when performing the highest spike in volleyball between the two dimensions used and the two dimensions required to perform advancement according to which are determined according to the player's physical measurements. The researchers used the descriptive approach in the style of interrelationships on a sample of the Iraqi national team players for the year (2001 - 2022) and the most important conclusions show that the two dimensions of the pivot base affect the maximum height reached by the player because the pivot base is a source of the product of strength and applications of mechanical foundations after jumping .