Why are menstrual cycles synchronized in women who often communicate with each other?

Why are menstrual cycles synchronized in women who often communicate with each other?

Is Period Syncing Real???

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answers (13)

Answer 1
September, 2021

I first encountered this concept.

Sometimes my daughter and I had the same cycles, well, cool, but they diverged and converged again.

Last month started at the same time .... and this one has a delay ... for both, and it's no longer a joke ... 7 days.

I recently had an ultrasound scan, everything is in order with women's health, the follicle is maturing, there is no menopause yet, I am 46 years old. Daughter 22g (I hope) is not pregnant.

"sync women". Stunned! What to do then? Go to the doctor together ?!

Answer 2
September, 2021

And five more answers:

Why do women have their periods synchronized? What is the biological expediency of this phenomenon?

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Answer 3
September, 2021

I have no idea how, but it still works, and it is not at all necessary to live together. My cycle with my mother almost never coincides, but if I communicate closely with one friend for quite a long time, it works. In the summer, cyclists always synchronized with a neighbor-friend, every morning we rode bicycles and this connection was quite convenient. Seriously, the synchronization was not only day to day, but also parties in the evening. When, with the beginning of school, they stopped communicating every day, the cycles diverged. It was the same with other friends. I noticed one thing, the closer you communicate, the more synchronous the cycles (may not be chutli at the same time or with a sprouting in 2-3 days). Yes, maybe once it was a pure coincidence. But for three years, every summer, with the same person, I don’t think ....

Answer 4
September, 2021

I do not even sync with those with whom I live, or relatives / girlfriends, so it is very doubtful all this, there are no proofs) .................. ............)

Answer 5
September, 2021

I was in a relationship with girls, for many years I lived with other girls in hostels of different universities and rented a house together. Over the years, neither I nor my acquaintances have found the slightest trace of synchronization.

This is a myth like a telegony. What are its roots? Perhaps it is based on a gross error of scientists, multiplied by trivial essentialism, when some mystical irrational properties are attributed to the female corporeality. In general, this is reminiscent of Van Helmont's "discovery" of the birth of mice in dirty linen, but this is not the seventeenth century.

Answer 6
September, 2021

I disagree with Anna Tsunskaya. In the same video that you attached, there is nothing to refute this. There are many scientific papers in which two female hamsters were placed in the same cage and, in the absence of a male, the menstrual cycles began to tend to synchronize. In the presence of a male, the opposite is true. This phenomenon was not observed in experiments where hamyak females were "plugged" their noses, which may indicate the mechanisms of action of this phenomenon. It was also found that the more dominant individual "synchronizes" the other female. This phenomenon, by the way, was described in American dormitories, in which only girls lived. Again, this was mentioned in the video. And again, no refutations were said to this. It was only said in not entirely accurate and objective research methods.

It would be more accurate to say not about complete synchronization, but about reducing the interval between ovulation of two females. It is also relevant not only, as you know, for hamsters, but also for all mammals, including humans. To claim that this is a myth, having absolutely no evidence, is also not entirely honest in my opinion. I don't argue that more research is needed for this topic to be sure.

Answer 7
September, 2021

No, this is a myth, and very tenacious. It appeared thanks to one low-quality study in the 70s, but it was not possible to reproduce the effect under the conditions of a correctly set experiment. Once in the masses, it has become entrenched due to cognitive distortions and a person's love for patterns.
Different women have different cycles in length and clarity. For some, everything is like a textbook - 28 days, for others more often, there are generally women with a cycle of 42-45 days, this is the norm and individually. As you understand, it is simply impossible to synchronize this, it is only possible to periodically enter the phase. I generally keep quiet about numerous women who take hormonal OK.

By the way, the cycle is called menstrual, and it is menstruation that is supposedly synchronized. And in order to detect ovulation within the cycle, you need to be very worn out. Most women have no idea when they ovulate. Accordingly, there are no statistics on the synchronization of ovulations.

https://www.youtube.com/embed/C7uLEfTcsQg?wmode=opaque

Available with Vert Dider voice acting in Russian.

Answer 8
September, 2021

Because they are not synchronized. This myth dates back to a 1971 study by experimental psychologist Dr. Martha McClintock. Martha researched women living in the same dorm and found that their menstrual cycles synchronize over time. She also suggested that pheromones play a leading role in the synchronization process.

The Claim: Menstrual Cycles Can Synchronize Over Time

However, a 2006 study published in Human Nature found that, first, Dr. Martha's findings are based on statistically insignificant, virtually random coincidences, and, second, that the menstrual cycles of women living in constantly interacting groups are not synchronized [Zhengwei Yang, Jeffrey C. Schank, 2006].

Women do not synchronize their menstrual cycles

Answer 9
September, 2021

We know why.

Because the sky is green, the water is wooden, and the kiwi is made of tangerines. Because the phenomenon of synchronization of menstruation does not exist in nature, which means that the answer to this question can be any.

Answer 10
September, 2021

This physiological phenomenon is called in medicine the McClintock effect, or (more poetically) the French brothel syndrome.

In the second half of the 20th century, a Harvard University professor (actually McClintock) noted that girls who lived room in a dormitory, the menstrual cycles tended to synchronize (complete synchronization was not observed, however, the rapprochement was very accurate, the difference was literally a day, no more). Further, in order to trace a certain pattern and make sure that this phenomenon is scientific, experiments were carried out on laboratory mice. Indeed, the results of the experiment confirmed the same phenomenon in experimental animals.
A little later it became known that this happens due to the action of pheromones of one girl, which are perceived by the organs of Jacobson in the body of another girl.
But, it is worth noting that official science denies the presence of pheromones as such, the presence of Jacobson's organs and, in general, such a phenomenon as the synchronization of menstrual cycles. the experiments are rather dubious and many scientists are accused of incorrectness.
If you want to hear my opinion, then, having asked about this from your friends, I can say that none of them had synchronization of cycles (apart from the so-called " imaginary synchronization ", since the menstrual cycle tends to shift and, it is logical that at some point they temporarily intersect). At the moment, this is only a hypothesis and it is not possible to consider it a scientific fact or some kind of paradox due to the lack of clear evidence.

Answer 11
September, 2021

The classic McClintock effect was, of course, shown using statistical methods and by experiment, and not by interviewing friends.

Nevertheless, new research casts great doubt on the fact that the described biological mechanism takes place. New experiments do not support this theory, and the statistical methods used in the original series of experiments were not entirely correct.

And please do not forget that humans do not have any pheromones. Pheromonal effects have not been shown in humans. We don't even have the extra olfactory system and vomeronasal organ that other mammals use to perceive pheromones.

Answer 12
September, 2021

Biologists know such a phenomenon as the McClintock effect, or French brothel syndrome. It consists in the fact that in many mammals that live in groups, among females, monthly cycles are synchronized over time. Synchronization is carried out using pheromones. Since Homo sapiens belongs to mammals, this effect is also manifested in us, although it is no longer needed for survival.

Now the question is - what benefit does this mechanism give in the wild?

First, it allows you to choose the most convenient time for childbirth, when more food is available and a comfortable temperature is.

Secondly, the life of predators becomes much more difficult. In the case when females give birth at random, predators can catch cubs all year round, regularly decreasing the population size. In the case of synchronous pregnancy, in one season there will be many juveniles in the group - the predators will not eat all of them at once, and when they grow up, the predators will have to hunt adults - and this is much more difficult.

Answer 13
September, 2021

It would be interesting to see statistics on this issue, but from personal experience - no. I live all my life with another woman, with whom I not only often communicate, but also completely share the genotype. And for all 10 years, I'm not afraid of this word, menstruation, the cycles have not been synchronized.

The illusion of "synchronization" in general in women I will write off on the fact that the cycles move and sooner or later they intersect, and since you often communicate with these women, then this topic may slip through the conversation. Such coincidences are stored in memory (you won’t remember who your cycles didn’t agree with) and the impression of “synchronization” is created.

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