Effect of Fatigue on Core Endurance, Dynamic Balance and Player Performance in Adolescent Football Players

The test performed on an outdoor field (artificial grass carpet) in the form of 6 repetitions of maximal 2× 15 m shuttle sprints interspersed with 20 seconds of passive recovery , Before the RSA protocol, all players perform a brief standardized warm-up (approximately 20 minutes long), in 1at submaximal speed (followed by 40 seconds of passive recovery The fatigue index (FI) used to characterize the RSA performance was calculated in terms of percentage decrement score At the end of the RSA protocol , usually the time elapsed between the end of the last sprint and the beginning of the measurements was no more than 20 seconds, to avoid masking effects related to progressive recovery from fatigue.

approximately 20 minutes long), which consisted of : 6 minutes of incremental running from 60% to 80% of maximal aerobic speed; 6 minutes of dynamic flexibility exercises; 2 minutes of forward, backward, and lateral jogging and high-knee and ''butt-kick'' runs; 2 minutes of shuttle sprints (5 m in 1 direction and 5 m in the opposite direction, repeated for 2 minutes) at submaximal speed (followed by 40 seconds of passive recovery); and 2 minutes of RSA protocol simulation at submaximal speed (2 repetitions), again followed by 40 seconds of passive recovery. take apenalty of water and rest