OBJECTIVE: The aim of this study was to evaluate the intra and inter-rater reliability of
pelvic floor muscle (PFM) dynamometric measurements for maximum and average
strengths, as well as endurance. METHOD: A convenience sample of 18 nulliparous women, without any urogynecological
complaints, aged between 19 and 31 (mean age of 25.4±3.9) participated in this
study. They were evaluated using a pelvic floor dynamometer based on load cell
technology. The dynamometric evaluations were repeated in three successive
sessions: two on the same day with a rest period of 30 minutes between them, and
the third on the following day. All participants were evaluated twice in each
session; first by examiner 1 followed by examiner 2. The vaginal dynamometry data
were analyzed using three parameters: maximum strength, average strength, and
endurance. The Intraclass Correlation Coefficient (ICC) was applied to estimate
the PFM dynamometric measurement reliability, considering a good level as being
above 0.75. RESULTS: The intra and inter-raters' analyses showed good reliability for maximum strength
(ICCintra-rater1=0.96, ICCintra-rater2=0.95, and
ICCinter-rater=0.96), average strength
(ICCintra-rater1=0.96, ICCintra-rater2=0.94, and
ICCinter-rater=0.97), and endurance
(ICCintra-rater1=0.88, ICCintra-rater2=0.86, and
ICCinter-rater=0.92) dynamometric measurements. CONCLUSIONS: The PFM dynamometric measurements showed good intra- and inter-rater reliability
for maximum strength, average strength and endurance, which demonstrates that this
is a reliable device that can be used in clinical practice.