A system and method for determining smooth muscle motor activity in body organs. The system comprises electrodes for recording an analog signal in the subject's body, an analog to digital converter that converts the analog signal to a digital signal and a processor. Processing the digital signal includes obtaining power spectra of the digital signal, and identifying one or more frequency peaks in the power spectra. A peak in the power spectrum is identified within a frequency range in which an organ generates slow waves. The energy of the identified frequency peak is measured and an energy above a characteristic threshold is indicative of smooth muscle motor muscle motor activity in the respective organ.