FIFA 11+ Warm-Up and Injury Risk Classification in Youth Amateur Soccer Players

This randomized controlled trial evaluated whether an eight-week, supervised FIFA 11+ neuromuscular warm-up program improves multifactorial injury risk classification, functional performance, and time-loss injury incidence in youth amateur male soccer players aged 15 to 18 years. Forty-four players from a regional amateur league were randomly allocated to either the FIFA 11+ group or a control group that continued its routine pre-training warm-up. Injury risk was classified using the Move2Perform algorithm, which integrates demographic data, injury history, the Functional Movement Screen (FMS), and the Lower Quarter Y-Balance Test (YBT-LQ). Jump performance and isometric lower extremity strength were also assessed at baseline and after eight weeks. Time-loss injuries were recorded prospectively throughout the intervention period. This study was registered retrospectively.

Inclusion Criteria: * Male, aged 15 to 18 years * Minimum of one year of competitive experience in an amateur soccer league * Actively competing in the Mugla Regional Amateur League at the time of enrolment * No diagnosed systemic disease * Written informed consent from a parent or legal guardian and written assent from the participant Exclusion Criteria: * Pain reported at the time of baseline assessment * Injury sustained within the six months preceding the study