Basal body temperature, also known as resting body temperature, is the body temperature measured after 6-8 hours of sleep, for example, in the morning when a person wakes up from a deep sleep and his or her body temperature has not been affected by exercise, diet or emotional changes. The basal body temperature is usually the lowest body temperature of the body during the day and night.
A, the correct method of basal body temperature measurement
1, equipped with a thermometer, master the table reading method, to ensure that the basal body temperature curve is accurate.
2.Every night before going to bed, the mercury column of the thermometer will be thrown to below 35 degrees, if it is an electronic thermometer into the initial value, placed in the place within reach after waking up.
3.Every morning immediately after waking up, put the thermometer under the tongue for 5 minutes and then take out the reading and record it on a special form. It can also be measured under the armpit, but generally the armpit temperature is not as stable as the oral temperature.
4.It is strictly forbidden to get up, urinate and defecate, eat and talk before measuring the temperature.
5, should record the presence of many factors that affect the basal body temperature, such as: colds, insomnia, alcohol, medication, emotions, etc.. In case of cold, fever, diarrhea, insomnia, alcohol consumption, use of electric blankets, excessive alcohol consumption, late sleeping and late waking, etc., it is often easy to affect the basal body temperature, which should be noted when measuring, while paying attention to the special marker instructions.
6.The day of menstruation and intercourse must be marked with additional marks.
7, the measurement results recorded on the basal body temperature table, in addition to recording on paper, it is best to record in the special basal body temperature management tool, can be more convenient, intuitive view of the basal body temperature curve, at a glance to see the low temperature period and high temperature period.
Second, the principle of basal body temperature
The thermoregulatory center is extremely sensitive to the action of progesterone (also known as luteinizing hormone), and a certain amount of progesterone can cause an increase in body temperature.
On the day after ovulation, the corpus luteum forms and the corpus luteum secretes progesterone, which causes the body temperature to rise by about 0.6 degrees Celsius, causing the body temperature to change between high and low phases. The high temperature period lasts about 12-16 days (average 14 days). If there is no pregnancy, the corpus luteum atrophies and stops producing progesterone, the body temperature drops and returns to the basic line and menstruation occurs. If you are pregnant, the body temperature continues to be high because the corpus luteum is supported by the hormones secreted by the embryo and continues to secrete progesterone. If the ovaries are malfunctioning, there is no ovulation and no corpus luteum formation, so the body temperature will continue to be low.
The basal body temperature of normal women of childbearing age varies cyclically, as does the menstrual cycle, and this change in temperature is associated with ovulation.
The basal body temperature in women is as regular as the physiological cycle. The basal body temperature of a woman with normal ovulation, from the day of ovulation to the day of ovulation, the low temperature period lasts about two weeks; from the day of ovulation to the day of the next menstrual period the body temperature rises 0.3-0.5℃, the high temperature period also lasts about two weeks.
This kind of low temperature curve is called biphasic temperature curve, which indicates that the ovaries have normal ovulation function, and ovulation usually occurs before or during the rise of body temperature from low to high.
The basal body temperature of normal women of childbearing age varies cyclically, as does the menstrual cycle, and this temperature change is related to ovulation.
The length of the menstrual cycle varies from person to person, ranging from 21 to 35 days, with an average of 28 days, separated by the day of ovulation, into the follicular phase before ovulation and the luteal phase after ovulation. The length of the follicular phase varies, but the luteal phase is fixed at about 14 days and the next two days. On the day after ovulation, the luteal phase is formed by the ovaries, and the secretion of progesterone causes the body temperature to rise by about 0.6 degrees Celsius, resulting in high and low body temperature changes.
1.If there is no pregnancy, the corpus luteum atrophies and stops secreting progesterone, the body temperature drops and returns to the basic line, and menstruation comes.
2.If pregnant, because the corpus luteum is supported by embryonic secretion of chorionic gonadotropin (hCG), it transforms into the corpus luteum of pregnancy and continues to secrete progesterone and the body temperature continues to be high.
3. If the ovaries are malfunctioning and there is no ovulation nor corpus luteum formation, the body temperature will continue to be low.