THE EFFECT OF VARYING INTENSITY TRAINING ON THE DEVELOPMENT OF STRENGTH ENDURANCE AND SOME BIOCHEMICAL VARIABLES FOR YOUNG 400M RUNNERS

Abstract

The rapid development in achieving high levels of sports in various fields, whether in team or individual games, goes in line with the technology of sports training science in general and with the science of biomechanics in particular And the strong and successful coach derives his strength and success from knowledge and if he wants to maintain that he must . Always be aware of everything that is new and to take science as a guide and you refer to it in the field of training through the science of biomechanics, which contributed to the progress of the motor performance of man in general and of the athlete in particular. And through kinetic analysis, the coach relied on the knowledge of minutes of movement especially the fast movement and the technical performance which depends on the integration of the mechanical conditions so it found the importance of avoiding the training path at one pace, which prompted the researcher to search and investigate through research in finding a new method, and she found delving into a type or method of modern methods that were not addressed and knowing its impact on young runners for the effectiveness of 400 m, which is a method The varying stresses and its impact on the achievement, strength and biochemical variables of the research sample. The study aimed to know the effect of this method on the research variables and imposed There are differences between the pre and post tests of the research sample in the biochemical variables and the strength of achievement. The researcher concluded that exercises with varying stresses contributed to improving the strength and achievement of the biochemical variables. The researcher recommends conducting research similar to other activities of athletics, and comparison in different training methods.