Sperm count of French men drops sharply by 32%, may signal larger decline: study
Andrew M. Seaman, Reuters | Dec 5, 2012 11:47 AM ET | Last Updated: Dec 5, 2012 1:57 PM ET
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When it comes to sperm counts, French men aren’t what they used to be, according to a new study.
Researchers found that between 1989 and 2005, the number of sperm in one millilitre of the average 35-year-old Frenchman’s semen fell from about 74 million to about 50 million — a decrease of roughly 32%.
“That’s certainly within the normal range, but if you think about it, if there continues to be a decrease, we would expect that we’ll get into that infertile range,” said Grace Centola, president of the Society for Male Reproduction and Urology in Birmingham, Alabama.
Clearly if this type of decrease continues, we’re going to find that we’re going to have young men that have low sperm counts
And the French aren’t the only ones who should be concerned, the researchers said.
“A decline in male reproduction endpoints has been suspected for several decades and is still debated all around the world.
Geographical differences have been observed between countries, and between areas inside countries,” said Joëlle Le Moal from the Institut de Veille Sanitaire in France, who led the study.
If the world follows the demographic habits of Europe — and that’s a big if — by the year 2200 it could be home to a population of less than half its current level, living in housing built for almost three times that number.
With the global population having passed seven billion on October 31, 2011, many of policymakers’ short-term worries revolve around providing resources for the additional 2-3 billion people expected to be born in the next half-century.
Writing in the journal Human Reproduction, Le Moal’s team said global analyses have found decreases in sperm counts, as did recent studies in Israel, India, New Zealand and Tunisia.
Centola, who wasn’t involved with the new research, said she had also found similar results in a group of young sperm donors from Boston in the United States.
For the new study, Le Moal’s team used a database of France’s 126 fertility clinics that recorded men’s semen samples from 1989 through 2005. They then narrowed their study to 26,600 samples provided by men whose female partners were later found to be infertile. That, they say, minimizes the risk the men had a fertility problem.
If this type of decrease continues, we’re going to find that we’re going to have young men that have low sperm counts
Over the 16-year period, the researchers found there was about a 2% annual decrease in the number of sperm in one millilitre of the average man’s semen.
“One would look at that and say it’s not all that much. It isn’t, but if it’s occurring on a yearly basis it can add up,” said Centola.
“Clearly if this type of decrease continues, we’re going to find that we’re going to have young men that have low sperm counts,” she said.
The World Health Organization defines anything over 15 million per millilitre of semen as normal. However, the study’s authors suggest it may take longer for men with counts in the lower range of normal to conceive.
The researchers also found that there was an increase in the number of abnormally shaped sperm over the study period, which can also influence fertility.
Part of that finding, however, can be explained by scientists getting better at recognizing misshapen swimmers, but not all of it.
“So both results are important,” said Le Moal.
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