'More sex needed' to boost sperm

研究發現》天天「炒飯」 有助受孕

【聯合報╱編譯莊蕙嘉／報導】 2007.10.17 03:23 am

以往認為懷孕困難的夫婦不應該天天「炒飯」，休息幾天再來，以使精子數目增加，提高懷孕機率，最近發現這個觀念可能是錯的。 澳洲雪梨大學的研究團隊發現，這麼做會使精子品質更差。有精子受損問題的男性如果每天行房，反而能提高精子品質、增加受孕機率。 參與研究的澳洲科學家在美國生殖醫學學會年會上發表研究結果指出，每天行房能使不良精子減少還能增加精子中健康細胞。 準備懷孕的夫婦可能以為，行房後休息數日，可以給男性充裕時間製造足夠數量的精子；但事實上，精子在體內停留過久反而可能產生變異。有問題的精子會降低受孕機率，還可能提高懷孕初期流產的風險。 此項研究觀察四十二位有「問題精子」的男性，讓他們連續七天每天射精並採樣，再與他們隔三天再射精採取的樣本比對，發現其中卅七人每天射精的樣本中，問題精子少了三分之一。 【2007/10/17 聯合報】 Source: http://udn.com/NEWS/LIFE/LIF2/4056969.shtml 'More sex needed' to boost sperm The more they get out, the better, the study suggests Some men should have sex every day to maximise the chances of getting their partner pregnant, researchers say. It is known for couples with fertility problems to abstain from sex for several days to boost sperm numbers before trying to conceive. However, the Sydney University team, addressing the American Society for Reproductive Medicine conference, said this could mean poorer quality sperm. One UK expert said daily sex might be better for men with damaged sperm. This research shows that when you put people on a daily ejaculation regime, it reduces the figure for DNA damage Professor Allan Pacey, British Fertility Society The Australian scientists studied 42 men whose sperm had been found to be an abnormal shape when examined under the microscope. They were told to ejaculate daily for seven days, and these samples were compared with those taken from them after three days' abstinence. All but five of the men had less sperm damage in their daily samples compared with the post-abstention sample. Fertility myth Dr Allan Pacey, the secretary of the British Fertility Society, said that while not having sex allowed the numbers of sperm to build up, there was a "trade-off" between quality and quantity. "This research shows that when you put people on a daily ejaculation regime, it reduces the figure for DNA damage. "If you can go from 30% to 20% that is quite a big shift and that should have some implications for fertility. "There are men out there who think, or whose partners think, that limiting ejaculation will make them more fertile. "I remember one couple in which the woman would only let the man ejaculate when she was in her fertile period, so the poor chap was going without for almost a month at a time." He said that if a couple was initially trying to get pregnant, an interval of two to three days was probably advisable - whereas a man with high DNA damage and a "decent" sperm count should try more often. Source: http://news.bbc.co.uk/2/hi/health/7045550.stm