مجلة الرافدين للعلوم الرياضية (Apr 2022)
The Relationship of Some Biomechanical Variables in the Explosive Force of the Two Legs and the Achievement of the Effectiveness of the Long Jump
Abstract
This research aims to identify the values of some biomechanical variables (linear momentum, rise and fall (m. S. K) of the body during preparation for the rise and explosive force of the legs , whether it is the left or right leg, work and ability, as well as some angles of the joints of some parts of the body that contribute to the achievement of the competitors. The long jump, the research sample consisted of the best (6) students from all stages of the College of Physical Education and Sports Sciences / University of Mosul who are proficient in the long jump for the 2019/2020 academic year. Data were collected through videography and the analysis was done by using (Adobe Photoshop), (Image Ready) and the program (Auto Cad 2010) , in order to identify the values of some of the biomechanical variables selected in the second section of the approach (weighted steps), especially the moment when the advancing foot touches the elevation plate and the moment when the advancing foot leaves the elevation plate (collision, push) despite the shortness of this stage Chronologically compared to the time of the rest of the technical stages of the long jump and its relationship to the explosive force of the rising leg (right or left) and achievement, as the results of the research showed the following conclusions : The variable of the explosive force of the legs during the hitting and touching of the rising leg with the elevation plate has a prominent role in achieving a better level of performance of the effectiveness of the long jump with the biomechanical research variables selected in the sample. - In the recovery stage, which was characterized by the need to increase the kinematic velocity (jump velocity) despite its short period of time in the stages (collision, absorption and thrust), the values of the biomechanical variables improved as a result of the attempt to increase the speed of recovery of the sample positively at the moment of thrust. Body angle in general and the angle of the trunk in particular, with the effectiveness of the long jump in the two moments of collision and push, the effective role in improving the level of achievement of the research sample. The job changers and the mobility ability have a basic role in the achievement depending on the mass and speed of the hopper and in the shortest possible time between the two moments of rise and push to achieve the best achievement, which will be related to the sports selection of this activity. Raise (m. K) the body as a kinematic variable and its decrease in the stages (collision, absorption, thrust) at the moment of rise in the stage of elevation has an effective role in improving the angle of flight achieved at the highest altitude of (m. K) the body in flight to achieve The farthest possible distance for the sample (completion. The researchers recommended the following : Emphasis during training on developing the explosive force of the legs because of its great importance in achieving achievement for long jump players. The possibility of developing the speed of the jump and increasing the height of the center of gravity of the body , because of its importance in the development of high and digital achievement. Working on the use of assistive devices and tools during elevation training to improve the art of kinetic performance (technique) for the elevation stage. Emphasis on good and appropriate sports selection for this activity from physical and physical characteristics, and applying research to more general and comprehensive samples.
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