Differences in Kinematic Parameters Between Successful and Unsuccessful Instep Kicks in Soccer

This study investigates the kinematic variables that distinguish successful from unsuccessful instep kicks in soccer. The analysis was conducted on 30 boys, aged 11, with an average weight of 38.53±6.18 kg and an average height of 146.17±7.23 cm, all members of FC Sloboda Soccer School. Each participant executed five instep kicks, recorded using two synchronized Casio Ex‐F1 cameras positioned 12 meters from the kicking location. Data was processed using the APAS motion analysis system (Ariel Dynamics Inc., San Diego, CA). Significant differences were observed in kinematic variables such as the height of the center of gravity during the last step before foot placement (p=0.05) and the angle of the knee in the kicking leg upon ball contact (p=0.05). The findings suggest that successful performance requires attention to the body's center of gravity height in the final stride, the swing phase's role in determining ball contact precision, and greater forward torso inclination during the kick.