RESUMO
INTRODUCTION: Functional intestinal constipation (FIC) has a high prevalence worldwide. It is higher in adult and elderly women, and in those with alterations in the pelvic floor muscle (PFM) structure and function. OBJECTIVE: The primary aim of this study was to characterize PFM function, including tone, of women with and without FIC. The secondary aim was to assess and compare the general and symptom-related quality of life (QoL) between participants with and without FIC and its correlation with the assessed PFM function. METHODS: This was a cross-sectional observational study, the outcomes were assessed using vaginal palpation, vaginal manometry and validated questionnaires: the Pelvic Floor Impact Questionnaire Short Form 7 (PFIQ-7), the Pelvic Floor Distress inventory (PFDI-20), and the Short-Form Health Survey (SF-36). This study included 60 women, 30 with FIC and 30 without FIC. The mean age of women with FIC was 48.2 years (standard deviation [SD] 12.22) and 51 years (SD 13.47) for those without FIC. Both groups were overweight. There was a significant difference between groups in the bowel domain of the PFIQ-7 (p = 0.016) and in the anal dysfunction domain of the PFDI-20 (p < 0.001), being higher in those women with FIC. Women with FIC presented a significantly worse ability to voluntarily relax their PFM (38.3%) than those without FIC (11.7%; p = 0.008). participants without FIC presented higher values of maximum voluntary contraction (MVC) assessed by vaginal manometry compared to participants without FIC (p = 0.008). PFM tone was not different between groups. CONCLUSION: Women with FIC have more difficulty in relaxing their PFM and lower MVC values than women without FIC. FIC negatively impacts women's symptom-related QoL. The main contribution of this study was to reavel the difficulty of the participants with FIC to relax their PFM. This finding is important to guide clinical decision making for an adequate treatment program direct to women with FIC.