医師の一分

アクセスカウンタ

zoom RSS ノートPCWi−Fiが精子に影響

<<   作成日時 : 2011/12/01 20:01   >>

なるほど(納得、参考になった、ヘー) ブログ気持玉 2 / トラックバック 0 / コメント 0

 ノートPCのWi−Fiは精子への影響があると言うが、本当だろうか。
 精子とノートパソコンと無線接続に関する最新の科学を信じるならば、デジタル時代は男性性器への影響が心配だ。
 アルゼンチンの研究者は、29人の健康男性の精子をWi-Fi経由でインターネット接続しダウンロード中のノートPCの下で数滴置き、4時間後の様子を調べたところ、PCから離れた所では泳いでいない精子は14%にすぎなかったのにPC下では1/4が動いていなかった。9%の精子がDNA損傷を受けておりコントロールの3倍であった。無線通信中に発生する電磁波の影響ではないかという。
 無線通信を使用していないPCの影響はなかったとの過去の報告はある。携帯電話からの影響で精子が弱まるとの研究もある。
 しかし、男性生殖泌尿器学会の会長オーツ氏は、ノートパソコンは、男性の生殖健康に重大な脅威であるとは考えていないと述べた。
 米国泌尿器科学会によれば、米国では6つに1つのカップルが不妊の問題を抱えており、その原因の半数は男性側にあるという。
 今月初めに発表された報告では、不妊治療中に果物や穀物をたくさん食べて赤身の肉・アルコール・コーヒーを減らした男性の成功率が高いという。

-----------------------------------------------------
Laptop Wi-Fi said to nuke sperm, but caveats abound
http://www.reuters.com/article/2011/11/29/us-laptop-sperm-idUSTRE7AR2FO20111129

By Frederik Joelving
NEW YORK | Tue Nov 29, 2011 4:39pm EST
画像(Reuters Health) - The digital age has left men's nether parts in a squeeze, if you believe the latest science on semen, laptops and wireless connections.

In a report in the venerable medical journal Fertility and Sterility, Argentinian scientists describe how they got semen samples from 29 healthy men, placed a few drops under a laptop connected to the Internet via Wi-Fi and then hit download.

Four hours later, the semen was, eh, well-done.

A quarter of the sperm were no longer swimming around, for instance, compared to just 14 percent from semen samples stored at the same temperature away from the computer.

And nine percent of the sperm showed DNA damage, three-fold more than the comparison samples.

The culprit? Electromagnetic radiation generated during wireless communication, say Conrado Avendano of Nascentis Medicina Reproductiva in Cordoba and colleagues.

"Our data suggest that the use of a laptop computer wirelessly connected to the internet and positioned near the male reproductive organs may decrease human sperm quality," they write in their report.

"At present we do not know whether this effect is induced by all laptop computers connected by Wi-Fi to the internet or what use conditions heighten this effect."

A separate test with a laptop that was on, but not wirelessly connected, found negligible EM radiation from the machine alone.

The findings fuel concerns raised by a few other research teams.

Some have found that radiation from cell phones creates feeble sperm in the lab, for example. And last year urologists described how a man's sitting with a laptop balanced on his knees can crank up the temperature of his scrotum to levels that aren't good for sperm. (See Reuters Health story of November 8, 2010, at reut.rs/gHmXpC.)

So between the heat and the radiation from today's electronic devices, testicles would seem to be hard-pressed.

But that is not at all clear, said Dr. Robert Oates, who has managed to father two kids despite having both a laptop and an iPad.

The president of the Society for Male Reproduction and Urology, Oates told Reuters Health he doesn't believe laptops are a significant threat to male reproductive health.

"This is not real-life biology, this is a completely artificial setting," he said about the new study. "It is scientifically interesting, but to me it doesn't have any human biological relevance."

He added that so far, no study has ever looked at whether laptop use has any influence on fertility or pregnancy outcomes.

"Suddenly all of this angst is created for real-life actual persons that doesn't have to be," said Oates, also of Boston Medical Center.

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.

While the impact of modern technology is still murky, lifestyle does matter, researchers say.

Earlier this month, a report in Fertility and Sterility showed that men who eat a diet rich in fruit and grains and low in red meat, alcohol and coffee have a better shot at getting their partner pregnant during fertility treatment. (See Reuters Health story of November 18, 2011, at reut.rs/v9bobG.)

"You should be keeping yourself healthy," including staying lean, eating healthy foods, exercising, not taking drugs and not smoking, agreed Oates.

And for those laptop worries, he mused, "I don't know how many people use laptops on their laps anyway."

SOURCE: Fertility and Sterility, online November 23, 2011.

-----------------------------------------------------
Fertility and Sterility
doi:10.1016/j.fertnstert.2011.10.012

Original article

Use of laptop computers connected to internet through Wi-Fi decreases human sperm motility and increases sperm DNA fragmentation
Conrado Avendano M.S.a, , , , Ariela Mata M.S.a, Cesar A. Sanchez Sarmiento M.D., Ph.D.a, Gustavo F. Doncel M.D., Ph.D.b

a Nascentis Medicina Reproductiva, Cordoba, Argentina;
b CONRAD, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, Virginia
Received 14 June 2011; revised 9 September 2011; Accepted 11 October 2011. Available online 23 November 2011.

Objective
To evaluate the effects of laptop computers connected to local area networks wirelessly (Wi-Fi) on human spermatozoa.

Design
Prospective in vitro study.

Setting
Center for reproductive medicine.

Patient(s)
Semen samples from 29 healthy donors.

Intervention(s)
Motile sperm were selected by swim up. Each sperm suspension was divided into two aliquots. One sperm aliquot (experimental) from each patient was exposed to an internet-connected laptop by Wi-Fi for 4 hours, whereas the second aliquot (unexposed) was used as control, incubated under identical conditions without being exposed to the laptop.

Main Outcome Measure(s)
Evaluation of sperm motility, viability, and DNA fragmentation.

Result(s)
Donor sperm samples, mostly normozoospermic, exposed ex vivo during 4 hours to a wireless internet-connected laptop showed a significant decrease in progressive sperm motility and an increase in sperm DNA fragmentation. Levels of dead sperm showed no significant differences between the two groups.

Conclusion(s)
To our knowledge, this is the first study to evaluate the direct impact of laptop use on human spermatozoa. Ex vivo exposure of human spermatozoa to a wireless internet-connected laptop decreased motility and induced DNA fragmentation by a nonthermal effect. We speculate that keeping a laptop connected wirelessly to the internet on the lap near the testes may result in decreased male fertility. Further in vitro and in vivo studies are needed to prove this contention.

Key Words: Laptop computer; Wi-Fi; sperm quality; fertility; sperm DNA fragmentation

C.A. has nothing to disclose. A.M. has nothing to disclose. C.A.S.S. has nothing to disclose. G.F.D. has nothing to disclose.



テーマ

関連テーマ 一覧


月別リンク

ブログ気持玉

クリックして気持ちを伝えよう!
ログインしてクリックすれば、自分のブログへのリンクが付きます。
→ログインへ
気持玉数 : 2
なるほど(納得、参考になった、ヘー)
驚いた

トラックバック(0件)

タイトル (本文) ブログ名/日時

トラックバック用URL help


自分のブログにトラックバック記事作成(会員用) help

タイトル
本 文

コメント(0件)

内 容 ニックネーム/日時

コメントする help

ニックネーム
本 文
ノートPCWi−Fiが精子に影響 医師の一分/BIGLOBEウェブリブログ
文字サイズ:       閉じる