Pelvic floor muscles (PFM) have to be able to contract strongly (Shishido et al, 2008), rapidly and reflexively (Deffieux et al; 2008; Morin et al, 2004) to guarantee continence. The ability of PFM to generate rapid and strong contractions results in the generation of an adequate squeeze pressure in the proximal urethra, which maintains a pressure higher than that in the bladder, thus preventing leakage (Miller et al, 1994). Rapid and reflexive PFM contractions are crucial for maintaining continence, preceding an abrupt rise in the intra-abdominal pressure associated with coughing, sneezing, running, or jumping (Morin et al., 2004). Studies have shown that the PFM function regarding power (rate of force development) was impaired in incontinent women compared to continent women (Deffieux et al, 2008; Morin et al, 2004).