Effect of Vaginal Stretching and Photobiomodulation Therapy on Sexual Function in Women With Pelvic Floor Myofascial Pain - A Randomized Clinical Trial.

Background: Spasm or increased tonus of the pelvic floor muscles (PFM) can cause myofascial pain (MP), which may result in painful intercourse and sexual dysfunction.

Aim: The effect of vaginal stretching (VS) with photobiomodulation therapy (PBMT) is compared to VS with sham PBMT in overall sexual function, rate and severity of painful intercourse at baseline and after treatment in women with pelvic floor MP.

Methods: A double-blind randomized clinical trial of 103 women with MP: 1 group received 10 sessions of VS with PBMT (4 Joules of near-infrared light-808 nm at 3 points), and the other group received VS with sham PBMT.

Outcomes: Impact of treatment was measured by the number of women experiencing painful intercourse, Pain severity was measured by Visual Analog Scale and sexual function was assessed by the FSFI questionnaire. Variables were assessed at baseline and after ten sessions in the intervention groups.

Results: After treatment, the number of women experiencing painful intercourse was significantly lower in both the VS with PBMT group (90.2-55%, P = .001), and VS with sham PBMT group (86.6-46.2%, P < .001). There was a significant reduction in pain measure by Visual Analog Scale (P < .001, [VS with PBMT group: P = .002; VS with sham PBMT group: P < .001]). There was a significant decrease in the number of participants with sexual dysfunction (FSFI score ≤26.55) after the treatment in the VS with PBMT group (92.2-74.5%, P = .003) and in the VS with sham PBMT group (90.4-76.9%, P = .035). Both groups showed improvement in the FSFI pain domain after treatment (P < .001, [VS with PBMT group: P = .038; VS with sham PBMT group: P = .005]). Only the VS with sham PBMT group had a significant increase in FSFI desire and total score (P < .001) after treatment.

Clinical Implications: We found that VS associated or not with PBMT may be effective in reducing complaints of painful intercourse, alleviating pain severity, and reducing the number of women with pelvic floor MP suffering from sexual dysfunction.

Strengths & Limitations: Strengths of this study are the randomized design and use of validated questionnaires. Limitation of the study is the lack of a long follow-up period and the lack of a usual care comparison group hampers generalizability of the results.

Conclusion: VS only and VS with PBMT have short-term efficacy in reducing painful intercourse and reducing a number of women with sexual dysfunction. Frederice CP, de Mira TAA, Machado HC, et al. Effect of Vaginal Stretching and Photobiomodulation Therapy on Sexual Function in Women With Pelvic Floor Myofascial Pain - A Randomized Clinical Trial. J Sex Med 2022;19:98-105.