Comparison of some Bio kinematic variables of the gravity center of the body in different heights in the skill of receiving a service in volleyball

مقارنة بعض المتغيرات البيوكينمانيكية لمركز ثقل الجسم بارتفاعات مختلفة في مهارة استقبال الارسال بالكرة الطائرة

Abstract

The correct scientific follow-up of sporting events by recognizing the most important movement variables, the minutes and parts of the movement and the precise details of each movement and each activity gives us a clear picture of the dimensions of the skill and the most important strengths and weaknesses of the performance stages and thus  light shed  on what must be used in terms of training and education methods to improve the reality of performance based on  what has been reached from the analytical results.

It has become necessary for those in charge of the educational process to go into clarification of the scientific facts by relying on analytical programs that do not accept doubt to indicate the level of the current state of the player and this gives us an accurate diagnosis of the situation under study and thus ease in giving treatments represented by corrective and developmental exercises for the level of performance and this will serve the reality of sports with the final result.

The game of volleyball is one of those games that are included in group activities, which consist of several interrelated and overlapping movement skills, and each skill has stages for technical performance, and mastering the total stages will ultimately lead to mastering the required motor duty

Through the use of biomechanical analysis, we can get to know the most accurate details of movement and its parts, and that movement segmentation is not a goal but a method used for the purpose of reaching a total and comprehensive awareness of the movement phenomenon as a whole. The research aims to:                                          

1.Identify the values ​​of some biochemical variables of the three reception methods used for the research sample.                                                                                         

2.Identify the differences in the values ​​of some biomechanical variables of the three  used  methods of service receiving .