One commenter on my Progesterone post mentioned that she loved how Toni Weschler's book taught her that there is so much more to the female cycle than just menstruation. I also loved this about the book. I explained to my husband that I agreed with Weschler's assessment of our society's current ways of teaching women about our bodies. I know I looked at menstruation with fear and shame as a young girl. In fact, when I told my mother about my first menstural period, she congratulated me and told me it was wonderful. I thought that was awkward. It didn't feel wonderful to me because I was never taught what was so wonderful about it. I plan to have it be different for my daughter.
When one of my peers asked about it in the class about puberty at school, we were told that the non-blood secretions from the vagina were "bacterial discharge"--sounds nasty. How I wish we could have been taught by someone who knew the truth--that the white/clear stuff is actually a fluid produced by the cervix in response to normal hormonal changes during the cycle. Of course, going into specifics about how observing it for pregnancy achievement or birth control would not be appropriate for this age group, but now seeing the ignorance of those who were supposed to be teaching us about our bodies, I can't help but feel a bit betrayed.
For some great suggestions and links about celebrating your daughters becoming women, see The Menarche at Bellies and Babies.
I also wanted to share a few links for some great online resources about fertility charting:
The Beautiful Cervix Project offers some cool pictures to supplement study of Fertility Awareness. It started with a woman using FAM for birth control sharing the photos she took of her cervix each day of her cycle, documenting the changes in it along with the other fertility signs she charted. The site has now expanded to include many different types of cervix pictures.
And here are a few sites that currently offer free charting software:
Showing posts with label menstrual cycle. Show all posts
Showing posts with label menstrual cycle. Show all posts
Tuesday, October 12, 2010
Saturday, October 9, 2010
Progesterone: the pro-gestation hormone
I just finished reading Taking Charge of Your Fertility by Toni Weschler. I had been wanting to read it for a while, and it is on the Childbirth International reading list, of which I have to read 3 books for my doula training. Although I had already learned the basics of fertility charting from the internet (and charted a little while trying to conceive my first), this book opened up a whole world of understanding for me about the female body, as well as a better understanding of my own (somewhat strange) gynecological history.
Progesterone's Role in the Menstrual Cycle
This chart shows the changes in hormone levels throughout the female cycle.
(image originally uploaded to Wikimedia by Shazz)
Part A depicts the follicle maturing, releasing the egg at ovulation, and acting as the corpus luteum after ovulation. Part B shows the changes in hormone levels throughout the cycle:
Progesterone has a warming effect on the body, which is why there is a shift in basal body temperature after ovulation. Progesterone sustains the lining of the uterus for the second half of the menstrual cycle, until the corpus luteum disintegrates, resulting in a drop in progesterone, which triggers menstruation. In late 2006 and early 2007, after I went off the birth control pill, before my daughter was conceived, I was anovulatory. My gynecologist prescribed an oral form of progesterone, which I was to take for a few days and then the drop in progesterone would trigger a bleed, which it did.
If the corpus luteum is not producing enough progesterone, the uterine lining would be unable to support implantation of a fertilized egg, often characterized by either spotting in this phase or menstruation starting too soon. In the fall of 2008, when I was breastfeeding my daughter, I was having issues with constant spotting. I took an herb called Vitex, which is said to increase the progesterone secreted by the corpus luteum. The spotting stopped, and I began to have menstrual cycles, so whatever the Vitex did to my hormonal balance, it worked.
Progesterone's Role In Pregnancy
If the egg is fertilized and implants, it secretes HCG, which is the hormone that changes the color of the second line on the pregnancy test. HCG tells the corpus luteum not to disintegrate and it continues to secrete progesterone, keeping the contents of the uterus in, until the placenta is fully formed and takes over the secretion of this hormone. The warming effect of progesterone continues in pregnancy, so the woman's core temperature remains at the slightly elevated post-ovulation level.
Initiation of labor is a complex process, and what exactly starts it is not known. A signal from the fetal lungs is proven to be one factor. Progesterone withdrawal, like that which causes menstruation, is a well-known theory, and probably also plays a role. Progesterone is said to inhibit oxytocin. That would explain why most women do not experience pre-term labor from activities that increase oxytocin levels, such as sex or breastfeeding. Oxytocin is free to cause contractions after the progesterone level has dropped.
While I was looking for links for my resource list on indications for induction, I found a Cochrane Review on the use of progesterone supplementation to prevent pre-term birth in at-risk women. The review found the progesterone made a significant difference in the women who carried their babies to term. Perhaps the placenta not producing enough progesterone is one cause of pre-term labor, just like not enough progesterone in early pregnancy is one cause of miscarriage. Just as it did during the luteal phase, progesterone keeps the contents of the uterus in.
Perhaps lowered progesterone levels when spontaneous labor is imminent is the reason that natural and low-tech induction methods such as membrane stripping (which triggers prostoglandins), breast pumps (which trigger oxytocin), and intercourse (which, if done correctly, does both), only start labor "when the body is ready." You can also see how trying to use artificial oxytocin to induce women whose progesterone level is still high could be tricky.
The body's process of starting labor and the role of different factors in it is something I'm quite curious about and hope more research is done on in the future. I'd be very interested to know what causes contractions to change from Braxton Hick's to ones that feel more intense, and why some women experience these more intense contractions on and off for days or weeks before entering active labor.
The more I learn, the more amazed I am by the human female body!
Progesterone's Role in the Menstrual Cycle
This chart shows the changes in hormone levels throughout the female cycle.
(image originally uploaded to Wikimedia by Shazz)- Follicle Stimulating Hormone
- Estrogen
- Luteinizing Hormone
- Progesterone
Progesterone has a warming effect on the body, which is why there is a shift in basal body temperature after ovulation. Progesterone sustains the lining of the uterus for the second half of the menstrual cycle, until the corpus luteum disintegrates, resulting in a drop in progesterone, which triggers menstruation. In late 2006 and early 2007, after I went off the birth control pill, before my daughter was conceived, I was anovulatory. My gynecologist prescribed an oral form of progesterone, which I was to take for a few days and then the drop in progesterone would trigger a bleed, which it did.
If the corpus luteum is not producing enough progesterone, the uterine lining would be unable to support implantation of a fertilized egg, often characterized by either spotting in this phase or menstruation starting too soon. In the fall of 2008, when I was breastfeeding my daughter, I was having issues with constant spotting. I took an herb called Vitex, which is said to increase the progesterone secreted by the corpus luteum. The spotting stopped, and I began to have menstrual cycles, so whatever the Vitex did to my hormonal balance, it worked.
Progesterone's Role In Pregnancy
If the egg is fertilized and implants, it secretes HCG, which is the hormone that changes the color of the second line on the pregnancy test. HCG tells the corpus luteum not to disintegrate and it continues to secrete progesterone, keeping the contents of the uterus in, until the placenta is fully formed and takes over the secretion of this hormone. The warming effect of progesterone continues in pregnancy, so the woman's core temperature remains at the slightly elevated post-ovulation level.
Initiation of labor is a complex process, and what exactly starts it is not known. A signal from the fetal lungs is proven to be one factor. Progesterone withdrawal, like that which causes menstruation, is a well-known theory, and probably also plays a role. Progesterone is said to inhibit oxytocin. That would explain why most women do not experience pre-term labor from activities that increase oxytocin levels, such as sex or breastfeeding. Oxytocin is free to cause contractions after the progesterone level has dropped.
While I was looking for links for my resource list on indications for induction, I found a Cochrane Review on the use of progesterone supplementation to prevent pre-term birth in at-risk women. The review found the progesterone made a significant difference in the women who carried their babies to term. Perhaps the placenta not producing enough progesterone is one cause of pre-term labor, just like not enough progesterone in early pregnancy is one cause of miscarriage. Just as it did during the luteal phase, progesterone keeps the contents of the uterus in.
Perhaps lowered progesterone levels when spontaneous labor is imminent is the reason that natural and low-tech induction methods such as membrane stripping (which triggers prostoglandins), breast pumps (which trigger oxytocin), and intercourse (which, if done correctly, does both), only start labor "when the body is ready." You can also see how trying to use artificial oxytocin to induce women whose progesterone level is still high could be tricky.
The body's process of starting labor and the role of different factors in it is something I'm quite curious about and hope more research is done on in the future. I'd be very interested to know what causes contractions to change from Braxton Hick's to ones that feel more intense, and why some women experience these more intense contractions on and off for days or weeks before entering active labor.
The more I learn, the more amazed I am by the human female body!
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