News; The basal body temperature measurement will control pregant

Published: Wednesday 04 March, 2015

The United States became popular a kind of ancient method of contraception: basal body temperature method of contraception.Its principle is simple: when a woman just after ovulation, the body temperature will make a little than usual.With a special thermometer and data synchronization to iphone applications, the user can see their own "cycle" and "temperature curve".It says the APP prediction accuracy is as high as 99.3%, so this kind of contraception by spectrum?Wake up every morning, students from the university of Pennsylvania beka will a named "Daysy" tears of thermometer under your tongue.If the thermometer into a green, she knew the day with her boyfriend have sex without a condom, if the thermometer become red or yellow, he needs to take protective measures.Old temperature method of contraception began to popular in the United States.Looks be like simple, but the core technology of this APP is very old, the common methods of body temperature method, the common methods of body temperature method.He based on the fact that when a woman just after ovulation, the body temperature will make a little than usual.With a special thermometer and data synchronization to iphone applications, the user can see their own "cycle" and "temperature curve".It says the APP prediction accuracy is as high as 99.3%, almost the same as the contraception contraceptive effect.The facts so that the old methods really on?Want to know, do not take care to "human life", is a nuisance.To understand the birth control based on the principle of the App, we need first to know about the basal body temperature curve.The principle of the basal body temperature curve formPrinciple is very simple, the formation of the basal body temperature curves, which was formed after ovulation ovarian corpus luteum secretion of progesterone (luteinizing hormone), progesterone levels after ovulation so the basal body temperature increases, the basal body temperature high and low two phase change.Mature female normal the next day after ovulation, the body because of ovarian corpus luteum formation, corpus luteum secretion form of progesterone (also called progesterone) of the temperature regulating center on progesterone is extremely sensitive, a certain amount of progesterone (12.8 nmol/L) can lead to increased body temperature,
so the temperature will rise after ovulation.In general progesterone can make the body temperature rises around 0.3 to 0.6 degrees centigrade.Under normal circumstances, the female luteal phase for 14 days or so, that is to say, corpus luteum secretion of progesterone (progesterone) for 14 days or so, so the high temperature period lasts approximately 12-16 days (14 days).From menstruation to before ovulation, because without corpus luteum secretion of progesterone (progesterone) influence of the temperature regulating center, so the basal body temperature keep in low temperature.In theory, if the track of the basal body temperature every day, will be able to know that time of ovulation.The basal body temperature method of contraception unreliable!So, in practice, the "temperature contraception" really feasible?That is not necessarily!1. NoThe temperature rise is really not much (to 0.5 ? is great, the NHS said is around 0.2 ° C (0.4 ° F)), it is easy to be buried on the baseline fluctuations in temperature.In order to reduce the error, the requirement in the morning when I was just wake up not doing anything, but even so still can't guarantee must be accurate.When it comes to safety period of time, he will say, no guarantee on time 100% of the women's physiological cycle, what can affect mood, disease, and environment, to catch up with itself menstruation to be not moved it more sure, even with the basal body temperature or oviposit test paper, these problems also exist.2. Work is slowAnother is that birth control is not to avoid the oviposit day went, sperm can survive for several days in the vagina, if you want to make it meet with the egg, have to N days before ovulation day began to avoid sex.But you are in monitoring the temperature rise is oviposit day has arrived, if not always data for reference, also don't know which day began to avoid sex.So, suppose you want to rely on body temperature to contraception, this kind of contraception can't take effect immediately, it need at least two or three cycles accumulation of data to be able to play a role.3. Hard to stick toThis and the security issue is also a reason.Based on oviposit period of crisis almost at least a week, each month the most applauded for clap a week applauded don't clap, you really don't think it easy to do.And compared with safety period, the basal body temperature detection more the task of measuring temperature every morning, it will be difficult to adhere to.Many academic institutions will, in theory, calculate oviposit day natural contraception can achieve 99% efficient, but at the same time they also stressed that it is really very, very theory..Due to the above factors, according to the actual effectiveness is much lower, including body temperature monitoring based on ovulation prediction method of contraception in the actual failure rate is about 24%, essentially all effective contraceptive methods that a minimum.Effect is poor and trouble, even if "natural" and what is good?Even if using high-tech packaging, this principle is also really difficult to expect it to have much effect.Want to contraception must choose at least one reliable method
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