Now a days the ultrasound is seen as a valid and reliable measurement tool to test the Pelvic
Floor Muscle (PFM) movement (Sherburn, Murphy, Carroll, Allen, & Galea, 2005). The hypothesis
is that the electromagnetic tracking system, TrakSTARTM, can measure the PFM movement in an
equal or even more precise way. The TrakSTARTM will have the advantage to be used in
measuring functional movements. In this Master thesis the hypothesis is to show a good
reliability by trampoline jumping (physical activity).