Figure 1

Graphical presentation of synchronization of contractions of normal (panel A) and fibromyomatous (panel B) uterus. Panel A shows the synchronization of the recording for the normal uterine activity. (a) Uterine contractions (standardized signals); (b) Running cross-correlation functions (values of the cross-correlation coefficients correspond to the gray levels); (c) Instantaneous time shift shows the maximal values of the cross-correlation coefficients for fixed time. Panel B illustrates the synchronization for the uterine activity in patients with fibromyomas; (a) Uterine contractions; (b) Running cross-correlation functions; (c) Instantaneous time shift. In panel A, the maximal values of the cross-correlation coefficients are mainly located in the area of the positive time lags. In this area there are 99.70 per cent points of the instantaneous time shift curve. So, the propagation% parameter equals 99.70. In this case, the fundal time series mostly runs ahead of the cervical one. In panel B, the maximal values of the cross-correlation coefficients are located in the areas of the positive and negative time lags. In the area of the positive time lags are located 61.08 per cent points of the instantaneous time shift curve. In this case we have disturbed synchronization.