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Is your laptop cooking your testicles? Whoever invented the 'laptop' probably didn't worry too much about male reproductive health.
Turns out that sitting with a computer on your lap will crank up the temperature of your nether regions, which could affect sperm quality.
And there is little you can do about it, according to the authors of a study out today in the journal Fertility and Sterility, short of putting your laptop on a desk.
The researchers hooked thermometers to the scrotums of 29 young men who were balancing a laptop on their knees. They found that even with a lap pad under the computer, the men's scrotums overheated quickly.
"Millions and millions of men are using laptops now, especially those in the reproductive age range," said Dr. Yefim Sheynkin, a urologist at the State University of New York at Stony Brook, who led the new study.
"Within 10 or 15 minutes their scrotal temperature is already above what we consider safe, but they don't feel it," he added.
So far, no studies have actually tested how laptops impact men's fertility, said Sheynkin, and there is no bulletproof evidence that it would. But earlier research has shown that warming the scrotum more than one degree Celsius (1.8 degrees Fahrenheit) is enough to damage sperm.
Under normal circumstances, the testicles' position outside of the body makes sure they stay a few degrees cooler than the inside of the body, which is necessary for sperm production.
"I wouldn't say that if someone starts to use laptops they will become infertile," Sheynkin told Reuters Health. But frequent use might contribute to reproductive problems, he said, because "the scrotum doesn't have time to cool down."
According to the American Urological Association, nearly one in six couples in the US have trouble conceiving a baby, and about half the time the man is at the root of the problem.
Both general health and lifestyle factors such as nutrition and drug use can influence reproductive health.
However, Sheynkin said tight jeans and briefs are generally not considered a risk factor.
"Clothes should not significantly change scrotal temperature, because you are moving around," he said.
To hold a laptop on your knees, however, you need to sit still with your legs closed. After one hour in this position, the researchers found that men's testicle temperature had risen by up to 2.5 C.
A lap pad kept the computer cool and also made sure less heat was transmitted to the skin. But it didn't do much to cool the testicles, and might give "a false sense of security," according to Sheynkin.
"It doesn't matter what pad you use," he said. "You can put a pillow beneath your computer and it still won't protect you."
As it turned out, leg position played a far bigger role. When the men sat with their legs spread wide -- made possible only by placing the computer on a large lap pad -- they could keep their testicles cooler. But it still took less than 30 minutes before they began overheating.
"No matter what you do, even with the legs spread wide apart, the temperature is still going to be higher than what we call safe," said Sheynkin.
Belkin International, Inc., which sells lap pads and other electronics accessories, did not wish to comment on the new findings.
Dr. James F. Smith, a urologist at the University of California, San Francisco, cautioned that a clear impact of laptop use on fertility had still not been shown, and that it probably didn't play a big role.5
Still, he added in an e-mail, heating up the scrotum is likely to be bad for sperm production. He often asks patients that he sees for infertility if they use a laptop and, if so, suggests that they spread their legs periodically or place the computer on a desk.
Dr. Smith said the consequences of continued overheating of the testicles -- so-called scrotal hyperthermia -- probably weren't permanent, but might take months to go away.
"When interested in maximizing fertility potential," he advised, "minimize harmful exposures, eat a healthy diet and exercise regularly.
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All the more reason to wear loose shorts with wide leg holes and keep your knees far apart in public places. Either that or make kilts and togas return to popular fashion.
It's not the wolf you see you should fear, but all the ones he howls with. Don't be afraid of the song, but don't piss off the choir.
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Hmm and how would this affect gay men?
If there was a general panic about this then only gay men would place laptops in their laps, that might prove useful in a crowded room. 
Age appears to be best in four things; old wood best to burn, old wine to drink, old friends to trust, and old authors to read. (Sir Francis Bacon 1561-1626)
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Hahaha! Instant gaydar! But I imagine it would affect the flavor of... well, I mean... I prefer mine raw thank you! 
I prefer guys that don't come in a box.
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timmy
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Has no life at all |
Location: UK, in Devon
Registered: February 2003
Messages: 13751
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I searched the journal you cited. I looked for 'laptop' and found this: http://tinyurl.com/26qg98z There was nothing else in the results list that seemed relevant.
There is no abstract, but the title implies something else:
"Laptop expositions affect motility and induce DNA fragmentation in human spermatozoa in vitro by a non-thermal effect: a preliminary report
It talks about a non-thermal effect. I wonder what that is?
[Updated on: Sat, 06 November 2010 23:23]
Author of Queer Me! Halfway Between Flying and Crying - the true story of life for a gay boy in the Swinging Sixties in a British all male Public School
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