title: Duration of the premenstrual phase of the menstrual cycle estimated by oestrogen and LH urinary excretion and basal body temperature.
abstract: Three women recorded their daily basal body temperature and collected 24-h urine specimens for total oestrogens and LH measurement during 12 consecutive cycles and one women did so for six consecutive menstrual cycles. The variability in the time relationship between these indices of ovulatory events in serial cycles is presented. In the pooled data the duration of the premenstrual phase from oestrogen peak, LH peak, and temperature rise, to the end of the cycle is 12.9, 12.1, and 10.8 days, respectively. The time differences between these indices are found to be biological constants.
mesh_terms: D000328:Adult; D001831:Body Temperature; D004967:Estrogens / Q000652:urine*; D005260:Female; D006801:Humans; D007986:Luteinizing Hormone / Q000652:urine*; D008598:Menstruation
chemical_list: D004967:Estrogens; D007986:Luteinizing Hormone