Patient's question:
What is a bipolar temperature?Doctor's answer:
Basal body temperature refers to the body temperature measured after a long period of sleep, before any physical activity has been performed. The basal body temperature of normal fertile women follows a cyclical pattern, similar to the menstrual cycle. This temperature variation is related to ovulation. Under normal circumstances, a woman's basal body temperature is lower before ovulation and rises afterward. This is because, after the ovary releases an egg, the formed corpus luteum and the secretion of progesterone stimulate the hypothalamic thermoregulatory center, leading to an increase in basal body temperature. This elevated temperature persists until just before the next menstrual period, when it begins to decline. The basal body temperature in the next menstrual cycle repeats this pattern. By recording the daily basal body temperature on a chart and connecting the data to form a curve, it becomes evident that the temperature is lower in the first half of the menstrual cycle and rises in the second half. This "low before, high after" temperature curve is known as a biphasic temperature curve, indicating that ovulation occurs, typically before the temperature rise or during the process of rising from low to high.