Comparative study of the values of the biokinematic variables of the arm and the horizontal distance of the ball from the longitudinal axis of the body between the numbers of high and medium height volleyballs

الملخص

The study of some biokinematic variables gives us the opportunity to discover the shortcomings in the technical performance of the skill of preparation and why kinematic variables are logical indicators that contribute to and affect motor performance, as well as the comparison of skill performance between high and medium altitudes in order to improve performance and reach the best skill performance of young prepared players in volleyball. The study aimed to identify the differences between some biokinematic variables of the arm and the horizontal distance of the ball from the longitudinal axis of the body between the numbers of high and medium height volleyball.

The researcher also used the descriptive approach in the method of correlational relations, and the research community included the 32 young players prepared in the Iraqi Premier League for the season (2023-2024). As for the research sample, it was chosen in a deliberate manner and their number was (10 young preparers) players representing  clubs ( Bahri , South Gas, Industry, Marshlands , Muqdadiya ), where they constitute( 31.25%) of the total community.   The main experiment was conducted for the period from  14/11/2023     to 20/11/2023 at 2:00 pm. Three attempts were given for each type of preparation skill used( high and medium ) and the data were processed statistically . Among them, the researcher reached the most important conclusions, which is the  emergence of differences between the skill of high frontal and medium height numbers  in (the variable of the angle of the elbow, the angle of the ball, the variable of the performance time). The differences were in favor of the skill of high height numbers, while the differences were in favor of the skill of medium height frontal numbers  in the variable of the horizontal distance between the ball and the longitudinal axis of the body and the speed  of the ball. The recommendations were to emphasize moving away as much as possible from high height numbers and the use of medium height numbers in training units and competitions  in order to reduce the performance time and reach the batter's hand for as long as possible .