An important additional effect: the stimulation of the autonomic nervous system through the skin sensors activates the internal organs. So, for example, digestive muscles and peristalsis will be encouraged by EMS training. Similarly, it can also lead to increased bleeding of the uterine wall. In individual cases this leads to an intensification of the menstrual period. However, we do not see menstruation as a contraindication for EMS training. Nevertheless, the trainee should be aware of this and make their own decision on whether to carry out training that particular week. But many female trainees do not miss their regular EMS training.