Andrew Huberman· PhD
we've got this thing that we call the menstrual cycle the ovulatory cycle the there's two phases a follicular phase and audial phase folicular precedes the ludal phase the ludal phase
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we've got this thing that we call the menstrual cycle the ovulatory cycle the there's two phases a follicular phase and audial phase folicular precedes the ludal phase the ludal phase
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and then what happens is the estrogen level starts to rise and it rises in response to a hormone called follicle stimulating hormone follicle stimulating hormone FSH that is getting her ready to ovulate and she ovulates at about the midpoint of her cycle so if we're just going to make the math easy on day 14 she's going to release a follicle from one of her ovaries and the estrogen level is sort of rising Rising Rising we love to measure hormones on day five because I want to have a standardized way in which I measure her hormones so our women know if we're in the business of trying to understand her hormones the day her period starts even if it's just a day of spotting that becomes our Benchmark and then day five I want to see every hormone on that day and if everything is going well I know what her FSH LH estradiol and progesterone should be on that day so the estrogen Rises starts to come down a little bit as she ovulates and then the luteinizing hormone kicks on because it's not going to prepare her uh uterus for uh the lining to accommodate a pregnancy so now you start to see estradiol go back but now for the first time progesterone goes up so progesterone has been doing nothing for 14 days and now it starts to rise and actually progesterone is the hormone that's dominating the second half which called her her luteal cycle so the first 14 days is the follicular cycle second is the luteal cycle
the cycle is divided into two phases technically three because there's a menstrual phase here but let's just acknowledge that the menstrual phase which starts at day zero that's the first day of bleeding even if it's just spotting and it's not a heavy period That's day zero that's the shedding of the endometrial lining which we'll talk about then you move into a follicular phase and the purpose of that phase which is really driven by follicle stimulating hormonal and estrogen is to ripen the follicle for ovulation ovulation takes place mid-cycle after ovulation we move into the luteal phase the luteal phase is dominated by luteinizing hormone and progesterone and the purpose of the luteal phase is to prepare the endometrial lining for implantation
this is where we enter the second half of the phase the luteal phase this is dominated by luteinizing hormones so the purpose of luteinizing hormone is to prepare the endometrium for this implantation