The effect of physical effort according to energy sources on the development of some physical attributes (speed - endurance of speed) according to the playing centers in U17 football

Abstract

The study aims to identify the effect of physical effort according to energy sources on the development of some physical attributes speed according to playing centers. After collecting the results and processing them statistically, it was concluded that the structural efforts according to energy sources had a positive and effective effect in developing transitional speed and speed endurance among the members of the experimental group, which was reflected in its impact on performance in football. On this basis, the study recommended conducting more studies aimed at knowing the effect of Physical efforts according to energy systems on various
physical attributes of soccer players