A master’s thesis in the College of Physical Education and Sports Sciences at Al-Qadisiyah University discusses the effect of endurance effort on performance by varying warm-up times on dopamine, lysine, and vitamin C.E, and their relationship to some physical abilities and complex skills of young football players. I discussed (a master’s thesis in the College of Physical Education and Sports Sciences (the effect of endurance effort on performance with different warm-up times on dopamine, lysine, and vitamin C.E and their relationship to some physical abilities and complex skills of young football players) by the student (Khaled Hakim Hassouni) and supervised by Professor Dr. (Asaad Adnan Aziz) The message aims to identify: 1- Numerical values ​​of dopamine, lysine, and vitamin C.E depending on warm-up times among young soccer players. 2- The effect of endurance effort on performance on dopamine, lysine, and vitamin C.E depending on warm-up times among young soccer players. 3- Analysis of endurance effort and performance in dopamine, lysine, and vitamin C.E according to different warm-up times and their relationship to some physical abilities and complex skills among young soccer players. The message concluded: 1- The increase in the numerical values ​​of dopamine and lysine after exertion for the warm-up time (35) minutes is related to the performance endurance of young football players. 2- The decrease in the numerical values ​​of vitamin C and E after exertion for the warm-up time (35) minutes is related to the performance endurance of young football players. 3- The correlation was high for the performance endurance test at a time of (35 minutes) with both physical and skill capabilities compared to a time of (15 minutes, 25 minutes) for young football players. This indicates that the warm-up time of 35 minutes is the best. 4- The message recommended:- 1- Adopting the results and data of dopamine, lysine, and vitamin C.E according to the different warm-up times (15, 25, 35) minutes among young football players as an important part during the sports season. 2- Emphasis on conducting laboratory analyzes of dopamine, lysine, and vitamin C.E to identify the level of these chemical variables for young football players. 3- Focusing attention on conducting more studies to identify the effect of the levels of dopamine, lysine, and vitamin C.E taken and their relationship to other variables that have not been studied.

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