I've noticed the fact that women who live together tend to become synchronised with their periods especially this year because I live in a female residence. I've changed my cycle by two weeks and now it's in tune to the day with my next door neighbour. Everyone on our floor (among our friends) who isn't on the pill has adopted her schedule (she is on the pill). It's quite amazing really because 6 or 7 of us are all having our periods right around the same time.
Does anyone know whether their is a scientific reason that this happens, and also who gets to be the one that the others follow. Ok, that didn't make sense, but why is it my next door neighbour that we have all synched with and not another girl on the pill?
Has anyone else had this experience? It does tend to make for stuffed garbages around that one week
I think I know what you mean. I've noticed this on my floor too. Although I'm not in tune with everybody else because I have a weird cycle (anywhere between 28 and 38 days). But the trash cans certainly do fill up for that week or so.
------------------ "Am I nervous? Am I scared? Is it worth it? Should I even care? ...Man I like this guy, I really like him alot!" ~Pam Tillis, 'Please'
I just saw a huge post on this last night, ach, I can't find it (the new search engine has me confused). I think it has to do with hormones or pheremones or something, I really don't know. I don't know if anyone knows.
Posts: 356 | From: Phoenix--name that plurally | Registered: Dec 2000
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quote:Stinkin' Synchin' [this title is Anne Kitchell's, not the MUM director's] The menstrual cycle not only produces odors, rumored to serve as attractive cues, but reacts to external odors as well. One often hears of females living in close proximity undergoing the synchronization of their menstruation onset times. In an article published by Russell et al. (1980), it was stated that "menstrual synchrony is not due to changes in food, awareness of menstrual timing or lunar cycles, and [it is] suggested that the only significant factors seem to be the amount of time the women spend together and the lengths of their cycles." They conducted a really cool experiment in an attempt to demonstrate if the olfactory cues of one very "regular" woman could influence the timing of menstrual onset in other women. Eleven women, whose mean age was 28.5 years, none of whom were lesbians or were taking oral contraceptives, volunteered to have an odor placed on their upper lip three times a week during a four month period. The odor was extracted from the axillary region (the armpit!) of a female donor with a history of a very regular menstrual cycle. She did not use underarm deodorant or perfumed soap, nor was she allowed to wash under her arms during the odor gathering period. Odor collection involved having the donor wear 4X4 cotton pads under her arms for 24 hours. The subjects had the pads rubbed on their upper lips and asked not to wash their faces for six hours. The group of control subjects received the same treatment, with the exception that they did not receive the odor. Test subjects and control subjects had no knowledge as to which group they belonged. The results indicated with statistical significance of p < 0.01 that odors from one woman can influence the the menstrual cycle of another. The mean difference in days between the menstrual onset of tested subjects and the donor at the beginning of the experiment was 9.2 days. This average decreased to 3.4 days by the end of the experiment with four of the five subjects synchronizing to within one day of the donor's onset. The control group averaged 8.0 days from the donor's onset in the pre-treatment month and 9.2 days in the post-treatment month. The possibility was noted that "the mechanism of [odor] transfer did not involve the nose at all, but diffusion of chemical compounds through the skin which may occur when the sample was placed on the subject's upper lip." If compounds placed under the nose were volatile and the subject unaware of their presence, then can one properly use the term "odor" anyway? The olfactory influences on the menstrual cycle of crab-eating monkeys (Macaca fascicularis) have been studied along the same lines as human synch experiments. Wallis et al. (1986) placed twelve female monkeys in adjacent cages allowing for the occurrence of physical contact. Only one of the females had a history of regularly-timed menstruation. A control set was established in the same manner with the exception that cages were situated far enough apart so no physical contact was possible. Within the course of the six-month study, the experimental subjects with irregular flow tended to normalize, although cycle synchronization was not observed as a trend. In the control group, irregular subjects continued to experience abnormally long cycles. The authors suggested, "Close physical contact may serve to transmit chemical and/or hormonal cues that can normalize the menstrual cycle of crab-eating monkeys." References: Russell, M.J., G.M. Switz, and K. Thompson. 1980. Olfactory influences on the human menstrual cycle. Pharmacol, Biochem., & Behav. 13: 737-738. Wallis, J. 1986. The effect of female proximity and social interaction on the menstrual cycle of crab-eating monkeys (Macaca fascicularis). Primates 27(1): 83-94. Doty, R.L. 1981. Olfactory communication in humans. Chem. Senses 6(4): 351-376. McClintock, M.K. 1971. Menstrual synchrony and suppression. Nature 229: 244-245.
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