Featured Research

from universities, journals, and other organizations

Sperm Counts Unchanged Over 50 Years

Date:
March 29, 2000
Source:
University Of Southern California
Summary:
Although many American men have at least one type of abnormality in their sperm, they are just as virile as their grandfathers, researchers at the Keck School of Medicine of the University of Southern California have found. In fact, their sperm densities were no different from samples collected in major studies in the 1950s.

Although many American men have at least one type of abnormality in their sperm, they are just as virile as their grandfathers, researchers at the Keck School of Medicine of the University of Southern California have found. In fact, their sperm densities were no different from samples collected in major studies in the 1950s.

"Everything in our study indicates that the average man's sperm count is not changing," said study co-author Rebecca Sokol, M.D., of the Keck School of Medicine of USC. The results are published in the March issue of the journal Fertility and Sterility.

Sokol and her colleagues looked at semen samples collected from 1,385 men at LAC+USC Medical Center over a three-year period between 1994 and 1997. At the time samples were taken, the men were partners of women who were seeking infertility treatment.

Examining total sperm counts and semen abnormalities, the investigators found that of the half who showed some sperm abnormality, based on World Health Organization criteria, 52% had sperm that were borderline low in mortality; 18% had abnormal sperm concentration, and 14% had abnormally shaped sperm.

Previous studies popularized in the press claimed that male sperm counts were declining because of everything from pollution to sedentary jobs to tight underwear - and even spending too long in the car.

Sokol said this new study was both large and well designed, so that the results can be trusted to be an accurate reflection of sperm quality among American men. She noted that, coincidentally, the pool of men who provided semen samples primarily worked in blue-collar jobs that could have exposed them to significant environmental toxins - so if a drop was found and if pollutants were the cause, it would have been likely to be represented in the findings. Sokol and her colleagues nevertheless found that values for the average sperm count were identical to the count reported in the 1950s.


Story Source:

The above story is based on materials provided by University Of Southern California. Note: Materials may be edited for content and length.


Cite This Page:

University Of Southern California. "Sperm Counts Unchanged Over 50 Years." ScienceDaily. ScienceDaily, 29 March 2000. <www.sciencedaily.com/releases/2000/03/000329081128.htm>.
University Of Southern California. (2000, March 29). Sperm Counts Unchanged Over 50 Years. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2000/03/000329081128.htm
University Of Southern California. "Sperm Counts Unchanged Over 50 Years." ScienceDaily. www.sciencedaily.com/releases/2000/03/000329081128.htm (accessed August 21, 2014).

Share This




More Health & Medicine News

Thursday, August 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Newsy (Aug. 21, 2014) An experimental drug used to treat Marburg virus in rhesus monkeys could give new insight into a similar treatment for Ebola. Video provided by Newsy
Powered by NewsLook.com
Cadavers, a Teen, and a Medical School Dream

Cadavers, a Teen, and a Medical School Dream

AP (Aug. 21, 2014) Contains graphic content. He's only 17. But Johntrell Bowles has wanted to be a doctor from a young age, despite the odds against him. He was recently the youngest participant in a cadaver program at the Indiana University NW medical school. (Aug. 21) Video provided by AP
Powered by NewsLook.com
American Ebola Patients Released: What Cured Them?

American Ebola Patients Released: What Cured Them?

Newsy (Aug. 21, 2014) It's unclear whether the American Ebola patients' recoveries can be attributed to an experimental drug or early detection and good medical care. Video provided by Newsy
Powered by NewsLook.com
Lost Brain Cells To Blame For Sleep Problems Among Seniors

Lost Brain Cells To Blame For Sleep Problems Among Seniors

Newsy (Aug. 21, 2014) According to a new study, elderly people might have trouble sleeping because of the loss of a certain group of neurons in the brain. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins