The purpose of this study was to illustrate dynamic behaviours of shank, foot and ball through ball impact phase. A time-frequency filtering approach succeeded in establishing more representative shank kinematics just before, during and just after ball impact whereas other procedures failed to remove noisy oscillation from the baseline, lost the peaks of rapid changes or produced totally distorted movement patterns frequently seen in many previous studies. Likewise, ultrahigh-speed video cameras (5000 Hz) and a mathematical model of ball deformation clearly demonstrated the dynamic interaction between the foot and ball during ball impact. It can be assumed that effectual duration to accelerate the ball corresponds to approximately three fourths of visually determined ball contact time and a longer contact time did not associated with a higher ball velocity.
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