Pregnancy is one of the main risk factors in the development of SUI in young women (Peyrat et al. 2002). Prenatal physiological changes such as increases in intra-abdominal pressure of the growing uterus and foetal weight on the pelvic floor muscles throughout pregnancy together with pregnancy-related hormonal changes in progesterone, oestrogen and relaxin may lead to reduced strength and the supportive and sphincteric functions of the pelvic floor muscle (Hilton & Dolan 2004).