دراسة تحليلة مقارنة في قيم بعض المتغيرات البايوكينماتيكيو و التزامن من بدء خطوات الاقتراب وفق ارتفاع الأعداد عند مهارة الضرب الساحق من المنطقة الخلفية

الملخص EN

The biokenematics analysis is an important scientific pattern in study of timing from starting of approaching steps according to height of setting and its relation of biokinematics at performance of jump spike from back area and it is facilities must put during training to reach the best performance.

The problem of the research requires accurate details of performance according to the height of setting and approaching steps.

The aim of the research is to recognize the values of biokinematics variations and timing from starting of approaching steps.

The Hypothesis of the research : there is a significant difference in some of the values of biokinematics variations and timing from starting of approaching steps.

The Researchers have concluded : the time of starting differs according to the height of setting and the time of reaching the ball differs according to the height of the ball.

The Researchers have recommended : emphasis on beginning of movement according to the height of the ball and that needs continuous exercises as to the trainees or the players in other levels, if the beginning is improperly, it will cause weak performance.