دراسة الفروق في بعض الصفات البدنية (السرعة الهوائية القصوى؛ القوة الانفجارية)‎ لدى لاعبي كرة القدم U21 حسب خطوط اللعب (دفاع، وسط، هجوم)‎

Abstract EN

Our study aims to identify the differences between (max imumaerobic speed and explosive power) in football players less than 21 years old according to the playing lines (defense, midfield, attack).the sample of our research included union Khenchela U 23 club from a way intentionally, and 18 players were selected as a sample for research from different playing lines and the comparative descriptive approach was used, two physical tests were applied, and the results of our study found significant statistically significant differences in the characteristics of maximum air speed and explosive power among under 21 football players according to the three playing lines.