How can father's running impact what happens in the womb? That is just stupid.
How can father's running impact what happens in the womb? That is just stupid.
if this is true, I am quitting running. I dont want a daughter, they whine too much.
Wow, other than which sperm gets to the egg first, sex of a future baby is not determined in the womb, if there is any effect of hormones on meiosis, differential release, or speed of sperm, it is from the male, so in essence, yes, a father's running may impact the sex of a child. Now, if we are talking about gender, completely different story, and the mother may have more of an impact due to exposure of hormones in utero.
Back to sex of a child, I don't know of how the hormones specifically act on one nucleus in one sperm cell while it is dividing, so until that basic bench research can be shown, correlation does not equal causation in my mind's eye. Until science can show that sex of a baby can be determined by anything other than chance, there is no point in altering your lifestyle to try to determine the sex of your child based on epidemiological studies. This "study" that was linked to before, is a good springboard and justification for further research, but by no means an end in itself.
Ed Eyestone - Four Girls
There has actually been research on this question.
http://www.runnersweb.com/running/news/rw_news_20050117_PPO_Testosterone.html
"To see if running mileage might have a stronger effect than placental burial, Eddie Crawford of the University of Glasgow took a careful look at the effects of weekly mileage, training intensity, paternal age, occupation, and competitive performance on offspring gender in 139 male runners ('Sex Ratio of the Children of Male Distance Runners,' Thesis, Institute of Physiology, University of Glasgow, 1992). Crawford became interested in the topic when a survey appearing in the publication Scotland's Runner revealed that just 23 per cent of the children fathered by runners engaged in serious training were boys.
"Crawford divided his athletes into several categories, including (1) individuals who were not actually training at the time they and their mates conceived a child, (2) subjects who were running between 0 and 30 miles per week when their partners became pregnant, and (3) runners who were training between 30 to 50 miles per week. To these runners, a total of 377 children were born (about 3.4 per man).
"Not running at all - or running less than 30 miles per week - proved to be a good way to increase one's chances of having a male offspring. Overall, about 62 per cent of the children of runners who were taking a break from training or who were running fewer than 30 weekly miles were male.
"However, things changed drastically when weekly mileage soared above 30 miles per week. For those runners who ran between 30 and 50 weekly miles, only 40 per cent of the offspring were gentlemen! According to Crawford, such high-volume running tends to produce dips in testosterone, which in turn produces a decline in the output of boys.
"Mileage proved to be the only factor which had an impact on offspring gender, as running intensity (average training speed), overall life stress, paternal age, social status, manual vs. non-manual labour, competitive success, and the time interval between marriage and conception all had no significant effect."
Boys are miscarried girls survive. That is why mother's exercise impacts gender, not fathers.
My wife and I have two children.
My oldest is a boy. He was conceived one autumn. I had stopped running that summer. I took a job promotion, my wife stopped teaching school in June, and we moved that summer. With all the job/life stress, I didn't start running again until after our son was conceived. I'd say I didn't run for about 5 months. BTW, it had been six years my wife and I had tried to start a family with no luck - that autumn was the first time she didn't work since grad school.
My youngest child is a girl. I was running/racing full time (50-70mpw) when she was conceived.
I believe Ed Eyestone has 4 girls.
If all that running and bouncing is not good for the sperm count...or sperm for that matter what is it saying if runners have more girls? Are they the dumb ones or are they the elite (survival of the fittest)...
ef wrote:
why is your name mendel?
Because he is an Augustinian monk who grows peas.
no, he grew peeps, get it right.
I have 2 girls, 0 boys
wow!
the way our life style has been going the last 10 years..we ain't going to have any girls...
20 years from now there are going to be a lot of sexually frustrated men...
I have 2 girls and no boys.
elactose wrote:
Unless you marry some fat porker the only thing guaranted is that if you have a boy he will probably be scrawny with a small penis. I saw a study one time suggesting that the better you are at distance running the smaller penis you have. Something to do with hormones. I'll post the study when I find it.
I would like to see that study. It must be flawed as I am certainly an exception to the premise of smaller 'endowment' as related to distance running ability!
43000 miles. Two girls.
3 boys & 1 girl... but not sure how my running would be classified as it's very up and down in terms of volume.
your wrong.... 35 girls, 0 boys
the facts wrote:
"Perhaps, the strongest link between mothers and offspring gender has been discovered in women who suffer from toxaemia in pregnancy."
The mom does NOT play a role in determining sex of offsrping. All eggs provided by the mom carry an X chromosome. If a sperm carrying an X chromosome fertilizes the egg, the sex will be female. If a sperm carrying a Y chromosome fertilizes the egg, the sex will be male. The dad determines the sex.
Except that:
1) Occasionally mothers spontaneously abort (miscarry), and there is evidence that under certain conditions these miscarriages are more likely to affect one sex than the other.
2) Though the father's sperm do indeed determine the sex of the foetus, there is evidence that the mother can provide an environment that is more "welcoming" to sperm of one sex than to sperm of the other sex.
Both of which mean that, under certain circumstances, it is entirely conceivable (sorry) that mothers play a role in determining a child's sex.
The Jackass wrote:
Trick questions...runners don't conceive b/c they never get any!
hahahahahaha,lol, that made me fall out of my chair. Soooo true.