Abstract: Overtraining syndrome frequently occurs in athletes who are training for competition or a specific event and train beyond the body's ability to recover. The purpose of this study was to comparison of overtraining indexes and body composition of elite youth football players during of general and precompetition phases.This study carried a semi – experimental methodology. In this study, 20 elite youth and healthy football players, ABOOMOSLEM competition as study’s subject that too well trained. The executive method of the study was such that after of elementary awareness, two blood samples were taken and analyzed in laboratory. For data analysis we performed descriptive statistics (average, standard deviation, variance and frequency tables) and inferential statistics (t.test) Using SPSS software.Physical aspects of the subjects before entered to general phase were consisted of; age (19.25 ±0.78) years, body weight (74.31± 1.98), skeletal- muscular mass (40.41 ± 1.01) kg, BMI (22.57±0.34) kg.m-2, and training experience (7.4 ± 0.86) years. During of data analysis, there were significance different between of total testosterone in pre and post of the different training phases that include general and special preparation and Pre-composition (t19= 23.79, p=0.000). Also, in amounts of cortisol between different training phases were significant different (t19= 16.92, p=0.000). As for to results of the study, it recommended to football coaches, first they must be notation to overtraining indexes that employing this study and second, to use of recovery, tapering and more execute of the various training, prevention of elite youth football players from dangerous of affection to overtraining syndrome.

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