Time/frequency analysis of the uterine EMG in pregnancy and parturition in sheep

The aim of this study was to evaluate the electromyographic (EMG) activity of smooth musc1es of uterine cervix (UC) and uterine horn (UH) in sheep during pregnancy and parturition in time/frequency domain and to recognize the differences between the two activities. The uterine electromyographic activity was recorded in eight sheep by electrodes, surgically implanted on UC and UH during pregnancy, parturition and postpartum. The data was sampled and stored digital1y on a PC computer in real time. All data processing was made off-line in the time/frequency domain. The results of the time/frequency analysis showed that the activity in UC and UH was changing during different observed periods and that there are differences between the musc1es activity in UC and UH. The use of the time/frequency distribution (TFD) bas been recognized as a successful method for analysis of smooth muscles activity in the UC and UH during pregnancy and parturition in sheep.