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During a normal menstrual cycle,the basal body temperature(BBT)rises around the day of the ovulation.The shift is small; it can be abrupt or gradual and it typically persists almost up to the end of the cycle.Detecting the beginning of the BBT rise is an important problem in infertility management,natural family planning and,also,in those medical studies using the day of the BBT rise as a proxy of the day of the ovulation.