OBJECTIVES: Our goal was to follow up the changes of pelvic muscle function during the perioperative period. METHODS: Fifteen women in postmenopausal period were included in the study. The surgical management included anterior colporrhaphy with or without posterior colporraphy or enterocele repair. Preoperative medical preparation ordered the use of oral (1mg estriol/die; T. Ovestin) and local  (U. Ovestin; 1mg/g estriol) estrogen for a month. The mean age of the subjects was 59.4 years (8.58 SD, median 57 years, ranging from 48 to 72 years), the average number of preceding pregnancies was 3.33 (1.68 SD) with 2,46 deliveries (1.46 SD). The pelvic muscle function was measured 1 month before (at the beginning of the preoperative preparation), 1 day before and 1 month after the operation. The following factors were measured: pelvic floor muscle activity, ability to relax and differences between left and right sides. The measurement of muscle parameters was performed by intravaginal surface EMG equipment. The statistical data were calculated according to mean, standard deviation, median, range, Fisher’s exact test, Student’s t-test methods and the results were considered to be significant at p<0.05. RESULTS: In the preoperative period (from the 1st to the 2nd measurement) a significant recovery (p=0.03) was found in the ability to relax pelvic floor muscle. In comparison of the 2nd and the 3rd measurement a significant decrease occurred in the average muscle activity (p=0.054) and on the left (p=0.034) side. The difference in the results of the 1st and the 3rd measurement was even more significant (p=0.005), there was a 20.8% average muscle activity decrease during this period. CONCLUSIONS: The results suggest to follow up the function of pelvic floor muscles in the perioperative period of colporrhaphy, and if it is necessary to begin the proper physiotherapeutic treatment.