The Effect of Postpartum Pelvic Floor Muscle Training in Women With Injured and Non-injured Pelvic Floor Muscles. A Single Blind Randomized Controlled Trial

Injuries to the pelvic floor muscles (PFM) and fascias may lead to urinary incontinence (UI), fecal incontinence, pelvic organ prolapse (POP), sensory and emptying abnormalities of the lower urinary tract, defecatory dysfunction, sexual dysfunction and chronic pain syndromes (Bump & Norton 1998, MacLennan et al 2009, Turner et al 2000). Prevalence rates of the most common pelvic floor disorders are generally high in the fertile female population

To date many randomized controlled trials (RCT) have demonstrated significant effect of pelvic floor muscle training (PFMT) in treatment of stress and mixed urinary incontinence, and it is recommended as first line treatment for stress and mixed UI in women (Level I, Grade A) (Abrams 2010). The effect of postpartum PFMT in prevention and treatment of urinary incontinence is investigated in only four RCTs (Sleep 1987, Meyer 2001, Chiarelli 2001, Ewings 2005) and one matched controlled trial (Mørkved 1997). The results are conflicting. The matched controlled trial by Mørkved (1997) shows the far most effective intervention so far, with 50% less prevalence of UI in the training group. Similar results were found for the same long term effect with 50% less prevalence of UI in the training group with the same long term effect (Mørkved 2000). The high effect size may be explained by the close follow-up and relative high training dosage. However, as this was not a RCT, the effect may be overestimated and the trial is often not included in systematic reviews (Hay-Smith 2008).

Only few research groups have measured PFM function and strength, and there are no studies evaluating possible effects of PFMT on PFM injuries and morphology following pregnancy and childbirth. DeLancey (1996) have suggested that the effect of PFMT would be much higher if we knew the causes of incontinence and were able to include only those with intact pelvic floor muscles. This may be true, but the statement also reflects a belief that muscle injury of the PFM cannot be treated with exercise. However, this is in contrast to common practice in treatment of other skeletal muscles e.g. after sport injuries, where all injuries are treated and it is believed that early mobilization and training is important in speeding up tissue healing (Järvinen 2007). Hence, there is a need to conduct a RCT with high methodological and interventional quality (Herbert 2005) to investigate the effect of postpartum PFMT.