Incontinence, physical activity, and pelvic floor muscle training in female pelvic cancer survivors after radiotherapy

Abstract

Background: Cancer treatment continues to improve, contributing to an evergrowing population of cancer survivors. Pelvic cancer survivors (PCS) constitute the second largest group of female cancer survivors after breast cancer. Many female PCS have been treated with radiotherapy as a part of their cancer treatment. Unfortunately, like all effective cancer treatments, pelvic radiotherapy is associated with a risk of subsequent, unwanted side effects. Some side effects remain or persist long after the end of treatment and some are even lifelong. A common and burdensome side effect after pelvic radiotherapy is urinary and/or fecal incontinence. Incontinence is known to negatively affect quality of life (QoL) and physical activity levels. Physical activity contributes to several positive health effects. In cancer survivors, it may reduce the risk of recurrence and even the mortality risk. Cancer survivors in general, and female PCS in particular, tend to be less physically active after cancer treatment than before treatment. When suffering from urinary and even fecal incontinence, pelvic floor muscle training (PFMT) is recommended as a first-line treatment for the general population. In addition to decreased incontinence levels, PFMT may contribute to increased physical activity and better QoL. However, little attention is given to PFMT as a potential treatment for incontinence in the Swedish national care program for pelvic cancer rehabilitation. Furthermore, there is as yet no evidence that PFMT is as effective in female PCS as in female non-cancer survivors. The effectiveness of PFMT cannot be taken for granted because female PCS survivors often have treatment-induced damage to structures in the pelvic floor that might affect its applicability. However, the problem of incontinence among female PCS remains, along with the fact that they tend to be less physically active than other cancer survivors. Indeed, this is an important research area and a necessary problem for health-care providers to resolve, not least for physiotherapists. Aim: The overall aim of this thesis is to improve the understanding of female PCS' experiences of incontinence in relation to physical activity, QoL, and rehabilitative efforts, including PFMT. This includes gaining increased knowledge about the relation between incontinence and physical activity in the form of exercise and QoL, and whether PCS experience that physiotherapy contributes in a valuable way to reducing their incontinence. This could enable the development of meaningful physiotherapeutic interventions, that PCS can and are willing to engage in, to achieve a potential reduction in incontinence, as well as increased QoL and activity levels. Methods: The thesis includes four different studies, using three different methods, all conducted with female PCS. Studies I (n=13) and IV (n=11) are qualitative individual interview studies, using semi-structured interview guides. Study II is a cohort-based cross-sectional observational study (n=578) and Study III is a prospective cohort-b...