title: Electrochemical vaginal-oral potentials during the menstrual cycle in women.
abstract: Electrochemical potentials were measured with non-polarizable salt electrodes (agar KCl-AgCL) during successive menstrual cycles in eight women. Four of them did not use any contraceptive, two were TCu users and the other two took oral contraceptives. Vaginal-tongue potentials presented biphasic cyclic changes. The vagina became positive in the middle of the menstrual cycle in all the women except those who were using contraceptive pills. Vaginal-oral potentials became positive (+) 24 hours after ingestion of oral contraceptives and up to 24 hours after discontinuation.
mesh_terms: D000293:Adolescent; D000328:Adult; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008598:Menstruation; D011199:Potentiometry; D014059:Tongue / Q000502:physiology*; D014621:Vagina / Q000502:physiology*
chemical_list: D003278:Contraceptives, Oral, Hormonal