Comparative Study in some biomechanics changes to libero for reception skill the two serves the jump serve and wave serve with jump in volleyball

	Comparative Study in some biomechanics changes to libero for reception skill the two serves the jump serve and wave serve with jump in volleyball
Sciences Journal Of Physical Education
Article 1, Volume 4, Issue 2, 2011, Pages 1-31
Abstract
Comparative Study in some biomechanics changes to libero for reception skill the two serves the jump serve and wave serve with jump in volleyball Provide data in biomechanics to libero when he performs the jump serve and was serve with jump , participate to achieve mechanic goal in this skill for two kinds , which is to pass the ball alertly to the setter , one of the reasons of bed setting passing the ball in a wrong it doesn’t correspond with setting good balls in achieve good spike particularly with variety skillful performance to serve . The most wide use the two serves the jump and wave serve . That’s why there's merging in receiving the balls form 2 serves . it requires the coach and libero to complete the needs of technical performance to receiving skill focusing on biomechanics . it make the skillful performance and not to train the libero just physically . It sue the accrued knowledge to different between dreads of skillful performance for receiving skill jump serve and was serve with a jump . The phwpcre of the research is to find out the biomechanics changes for libero in performance receiving skill to the differences in some biomechanics changes to libero between performing skill receive the two serves the jump serve and wave serve with a jump in volleyball . The rescanned uses the descriptive course in comparison trying some modification in testing the accuracy of receiving and codify laws (rules) and make that test on the major group using feature machine video and analyzes the results by computer . The researcher concludes some changes in the height of the hip while rouching the ball and the height the ball after returning to ask from the hands was bigger while receiving the wave serve with a jump because of the speed of low ball relatively from the wave serve with a serve it . The researcher recomrands the coaches players differential between receiving the jump serve and wave serve with jump . because each one of them needs special mechanic confirming the mechanical basis in performance .

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