Biomechanics analysis of the side-foot kick in female soccer players with preferred and non-preferred leg

• Main Authors: Shen, Chin-Yi, 沈進益
• Other Authors: Tsai, Chien-Lu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/38g9du

博士 === 國立臺灣師範大學 === 體育學系 === 106 === The side-foot kick is one of the most used skills in soccer. The side-foot kick is frequently used for penalty kicks but there are few researches focused on the side-foot kick. The purpose of this study was to identify the biomechanical analysis of the side-foot kick in female with the preferred and non-preferred legs. Eight skilled female soccer players (age 21.25 ±1.33, height 1.61 ±0.05, weight 57.23 ±7.69) were recruited to be the participants. They were instructed to performed side-foot kicks with maximum effort. Their motions and ground reaction force were recorded by 10 motion capture system cameras (Vicon MX-13+, 250 Hz) and a force platform (Kistler 9287, 1000Hz), and then calculates the kinematics and kinetic data with Visual 3D. The data obtained were assessed using the Wilcoxon match-pairs signed-ranks nonparametric statistical test, the significant level was set as α=.05. The ball velocity, the total movement time and the backswing time, the peak hip flexion torque and the knee extension torque of the preferred leg were significantly greater than the non-preferred leg. This study found that hip flexion torque was an important factor affecting knee motions. In the proximal-to-distal energy transfer from the motion of the kicking foot, we found both motions obeyed the kinetic chain theory. When the kicking leg was from toe-off phase, the back-swing motion of the leg had a gain effect. So, we recommend in teaching, the stretching of the kicking foot causes the flexor muscles of the thigh to exhibit eccentric contraction, that might increase the storage of energy and the hip torque in leg-cocking, helps the shank extension velocity and increasing ball velocity. In terms of lower limb coordination, increased the hip extension angle and knee flexion angle could increase the contact velocity with the ball while performing the utilize knee extension to the maximum joint angular velocity at the appropriate timing. This results leaded to increase foot and ball speed directly. The role of the support foot was braking and assisted the kicking performance.