Muscular work in terms of isotonic contraction and their effect on the values of some biomechanical indicators of smash service among volleyball young players

تدريبات الشغل العضلي بدلالة الانقباض الايزوتوني وتأثيرها في قيم بعض المؤشرات البيوميكانيكية للأرسال الساحق بالكرة الطائرة للشباب

Abstract

The  research significance  lies in studying the effect of muscle workout exercises in terms of the isotonic contraction, as it contributes to improving the muscle stretch strength, which is related to the amounts of mechanical strength projected during moments of propulsion, as well as the effect of these exercises on the values ​​of some biochemical variables of  smash service skill in volleyball to reach the best mechanical conditions appropriate to perform the skill and that the development of muscular work in its various manifestations, such as central work and decentralized work by facing the muscle, the strength of resistance and the power of insufficiency and the resulting development of muscle elasticity is one of the most important problems facing coaches and in charge of the training process. The research aimed to prepare numbers of muscular work as a function of the isotonic contraction of high smash service among   volleyball young players, as well as identifying the effect of muscular work on the values ​​of some biomechanical variables of  smash service in volleyball  of the research group

The researchers used the experimental approach to design  one experimental group. As for the research sample, it was determined in a deliberate  manner, and they are  (6) players  of smash service from Al-Gharaf Sports Volleyball for youth in Al-Shatrah district. It took 8 weeks to implement performance training exercises in  (3) Training units per week. The researchers also used a video camera and a force measurement platform, and the results were analyzed by the software for analysis through the use of (SPSS, Logger Pro 3.10.1, Kinovea 0.8.24) to obtain the values ​​of the biomechanical variables of the study, The most important conclusions are the emergence of  evident development t in the level of technical performance of the skill of smash service as a result of the development of muscular work and some biomechanical  indicators. The recommendations emphasize the application of the various muscular  work training to develop Muscle stretching ,which is responsible for sustaining and integrating skill performance.