Fig. 3. Raw EMG of the m. iliopsoas and the m. vastus lateralis and the high-pass filtered signal from m. iliopsoas. The time used to perform the soccer kick until impact was between 850 ms and 1095 ms. The rest of the signal was collected when the
subject was approaching the ball at high speed before the actual kicking movement and after impact when the subject tried to stop the movement forward. Note the difference in baseline shifts between the two muscles and the removal of the baseline shifts with a high-pass filter.