Kinetic analysis of maximum effort low drive and high drive soccer instep kick via dynamic model

The aim of the present study was to examine the difference between maximum effort low drive and high drive soccer instep kick in kinetic parameters by developing dynamic model. Six skilled collegiate soccer players volunteered as subjects in the study. Average of the subjects individual characteristic have contained، age: 25/16±2/2 years، weight: 70/6±6/6 Kg and height: 173±6/5 cm. In order to calculate the lower extremity joints kinematic parameters and kicks velocity، five markers attached to anatomical points of the foot (iliac crest، greater trochanter of femur، lateral epicondyle of knee، lateral malleolus and lateral phalanges of foot) and their movements were filmed at 240 Hz with two Casio ZR200 cameras. In order to calculate kinetic parameters of motion، kinematic parameters were entered into the model. This model was built with Simmechanics software and it had 4 degree of freedom. The results indicate that there were significant difference between low drive and high drive instep kick in thigh flexion and ankle plantar flexion moment. Also no significant different were found in thigh abduction and knee extension moment among low drive and high drive kicks. Finally، to demonstrate a powerful and coordinate soccer instep kick، joint torque should occur with a sequence.