日韩午夜精品视频,欧美私密网站,国产一区二区三区四区,国产主播一区二区三区四区

--- SEARCH ---
WEATHER
CHINA
INTERNATIONAL
BUSINESS
CULTURE
GOVERNMENT
SCI-TECH
ENVIRONMENT
SPORTS
LIFE
PEOPLE
TRAVEL
WEEKLY REVIEW
Film in China
War on Poverty
Learning Chinese
Learn to Cook Chinese Dishes
Exchange Rates
Hotel Service
China Calendar


Hot Links
China Development Gateway
Chinese Embassies

Sperm Levels Drop with Frequent Ejaculation

The more a man ejaculates each week, the lower his sperm levels fall, new research shows. However, this ejaculatory frequency only partly explains why a man's sperm count varies widely each time it's checked.

The findings, which appear in the medical journal Fertility and Sterility, are based on a study of 27 healthy men who provided monthly semen samples and responded to questionnaires regarding ejaculatory frequency, duration of abstinence, and episodes of fever. The subjects were followed for 16 months.

No seasonal variations in sperm levels, movement, or shape were seen, lead author Dr. Elisabeth Carlsen and colleagues, from Rigshospitalet in Copenhagen, note. However, ejaculation frequency was higher in spring months than in the winter months.

As noted, sperm levels fell as weekly ejaculatory frequency increased. Compared with one ejaculation, sperm level fell 29 percent with two ejaculations and by 41 percent with three ejaculations. In contrast, ejaculatory frequency seemed to have no effect on sperm movement or shape.

The sperm characteristics noted in one sample often differed greatly from those observed in a subsequent sample from the same subject. This wide variation dropped markedly when three semen samples were used instead of two. Ejaculation frequency, duration of abstinence, and the presence of a fever episode were small contributors to this variation.

"The majority of the (this) variation remained unexplained," the authors note.

The findings also suggest that "at least three semen samples should be recommended to estimate an individual's semen profile," they add.

(Agencies September 2, 2004)

Mobile Phones May Damage Sperm?
HK, Mainland Scientists Reveal Mystery of Sperm Maturation
China's 1st Human Sperm Bank Opens for Deposits
China's First Sperm Bank Opens for Deposits
Donations of 'Elite' Sperm Are in Demand
Sperm Storage Unloved in Shanghai
Print This Page
|
Email This Page
About Us SiteMap Feedback
Copyright © China Internet Information Center. All Rights Reserved
E-mail: webmaster@china.org.cn Tel: 86-10-68326688
主站蜘蛛池模板: 九台市| 肥城市| 岗巴县| 白玉县| 镇巴县| 蓬溪县| 昭通市| 望江县| 嘉义县| 金山区| 九龙县| 旬邑县| 大石桥市| 湟源县| 星座| 通州区| 于都县| 鸡西市| 昆山市| 盘锦市| 长治县| 丰县| 侯马市| 商都县| 襄垣县| 磴口县| 政和县| 登封市| 东乌珠穆沁旗| 诸暨市| 宁波市| 石河子市| 自贡市| 太康县| 南皮县| 黄浦区| 绵阳市| 扶绥县| 故城县| 永和县| 文成县|