دراسة مقارنة للمهارات الدفاعية وفق تخصصات اللعب (اللاعب الليبرو و الأعداد و الضرب الساحق)‎ بالكرة الطائرة

الملخص EN

The scientific and technological developments that the world witnessed in the present time were due to the application of modern scientific and technological foundations which contributed to the development and raising the level of science in general and the level of sports in particular .

There is no doubt that the high level of advanced sports achievements in the present day is strongly linked to the achievements of the world and the great technological development due to the entry of technological science into all spheres of life which created new qualitative development graders to solve many issues and problems of sport activity.

The sport movement has developed rapidly and effectively over the past years.

This development has emerged as a result of many of the changes that have taken place in most of the games, including volleyball, which has enjoyed a lot of these developments, whether in the game law or upgrading the player`s physical, skilful and planning, psychological and mental abilities ,which reflected in achieving athletic achievements at all levels.

The Libero player, who is dressed in a different outfit of the players, has defensive duties.

The Libero enters the back zone only with defense skill and is in the centers where Center No.

1, Center 6, Center 5 and Libero in defense skills, taking into consideration that the rest of the players also perform defensive skills in addition to other skills, but what makes him special is that Libero is different from the players .

So for the importance of this subject ,the researcher stated a comparative study of this skill so that the trainers have a clear picture of the capabilities of the players liberos ,and what are their defense capabilities due to their being special in this field and whether their selection is based on scientific grounds for occupying the defense areas to win the games.

The research aims to identify the following : -The level of defense skills according to the disciplines of the game (player and the Libero and preparation and smash ) volleyball -The difference between defense skills according to the disciplines of the game (player and the Libero and preparation and smash) of volleyball.