Association Between Pre-Season Physical Capacity and Injury Risk in Professional Soccer Players

A prospective observational cohort consisting of 28 professional male soccer players aged 18-35 years with at least five years of training experience. Participants undergo pre-season physical performance assessments, including anthropometric measurements, countermovement jump (CMJ), overhead squat assessment, aerobic fitness using the 30-15 Intermittent Fitness Test, eccentric hamstring strength using the NordBord system, and hip abduction and adduction strength using the GroinBar system. Lower-extremity injury occurrence, anatomical location, injury type, duration, and recurrence are subsequently monitored during the competitive season using records obtained from club physiotherapists and coaching staff. No randomization or experimental training intervention is performed.