使用手机会降低男性的精液质量 Poor semen quality in Switzerland, why?

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编者按:精液质量差不仅仅是瑞士的一个问题。 中国研究人员回顾了41项研究,发现精液质量下降与手机使用之间存在联系.

手机的使用可能是导致问题的原因。 研究证明,手机辐射会使精液质量恶化。 发表在“生育与不育”杂志上的另一项研究发现,使用手机会降低男性的精液质量,包括精子数量减少,活力,活力和形态改变。 对于每天使用手机更长时间的用户而言,精子数量减少更多.


乌克兰的一项研究还发现,暴露于手机辐射下会导致精子受损,包括DNA碎片和精子活动性。 DNA片段化可导致后代遗传疾病和基因组不稳定,而活动能力降低可减少女性受孕的机会。

Editor’s note: Poor semen quality is not just a problem in Switzerland. Chinese researchers reviewed 41 studies and found the link between decreased semen quality and use of cell phones.

Could use of cell phones which emit harmful electromagnetic radiation be the cause for the problem.  Studies have proved that cell phone radiation can worsen the semen quality. One study published in Fertility and Sterility finds that use of cell phone decreases the semen quality in men including decreased sperm count, motility, viability and changed morphology.  The change is greater for users who use cell phones for more hours a day.

The worse problem associated with cell phone radiation is that some genetic mutation caused in sperm which could lead to genetic defects or abnormalities in offspring. An Egyptian study shows that cell phone radiation can cause testicular change not just sperm.

A study from Ukraine also found that exposure to mobile phone radiation can cause damage to sperm including DNA fragmentation and sperm mobility.  DNA fragmentation can cause genetic disease and genome instability in offspring and reduced mobility can reduce the chance for women to get impregnated.

More studies can be found here:


Poor semen quality in Switzerland

Researchers at UNIGE have carried out the first nationwide study on semen quality of young Swiss men — and their verdict? Only 38% of men have semen parameter values above the norms set by World Health Organization for fertile men

Université de Genève

Over the last fifty years, a marked decrease in sperm count has been observed in the Western World. But what about the situation in Switzerland? Up to now, no study had evaluated the reproductive health of Swiss young men. Researchers from the University of Geneva (UNIGE), Switzerland, working in collaboration with other institutions and with a logistical support from the Swiss army, have undertaken the first nationwide assessment of the semen quality of men between the age of 18 and 22. The scientists assessed three important parameters: the number of spermatozoa, their motility and morphology. The results were well below the reference values issued by the World Health Organisation (WHO). The current situation is a matter of concern since the poor semen quality of Swiss men is associated with an increase in the incidence of testicular cancer. You can read about the study in the journal Andrology.

The number of infertile couples in Switzerland using assisted reproductive technology (ART) doubled from 3,000 to over 6,000 a year between 2002 and 2010. Causes can be due to men as well as to woman, however in 10-15% of the cases, infertility is unexplained. Several envriomental and lifestyle factors can influence the couple’s fertility stress, alcohol or cigarette consumption to list a few. A determining factor in a men’s fertility is his semen quality.

Numerous epidemiological studies in industrialised countries over the past decades have shown a drop in semen quality with a particular decrease in the sperm concentration from 99 million per millilitre (ml) to 47 million per ml. “It’s important to understand that the time needed to conceive increase significantly if a man has a sperm concentration below 40 million sperm per ml,” explains Serge Nef, professor in the Department of Genetic Medicine and Development in UNIGE’s Faculty of Medicine. A man whose sperm concentration is below 15 million per ml can be considered subfertile and is more likely to encounter problems conceiving a child, regardless of the fertility of his partner. Infertility is defined as the inability to conceive after 12 months of regular unprotected sexual intercourse.

First national study on the quality of Swiss sperm

The UNIGE researchers conducted the first national study on the quality of Swiss sperm by analysing the profile of 2,523 young men aged 18 to 22 as part of their military recruitment. The men came from every canton in Switzerland and were conceived and born in the country. They completed a questionnaire about their health, lifestyle, diet and education. In addition, their parents filled in a questionnaire about their own lifestyle, diet, health and the course of the pregnancy. This was designed to assess the conditions under which gestation took place and to evaluate the possible impact on the reproductive health of the young men. Semen quality is defined by three important parameters: the sperm concentration (number of sperm per ml), their motility and morphology. “Low semen parameters values can reflect a men’s fertility, when a combination of values are low, a men’s ability to conceive is at risk,” says Rita Rahban, a researcher in the Department of Genetic Medicine and Development and the study’s first author.

The researchers analysed the semen samples of the volunteers by measuring the semen volume and the sperm concentration, motility and morphology.

Swiss sperm: bottom of the league

Sperm counts vary from one country to another, with median concentrations ranging between 41 to 67 million per ml for young European men. By way of comparison, Swiss men with 47 million per ml are at the bottom of the pack alongside Denmark, Norway and Germany.

Based on the WHO thresholds established in 2010, the results of the study indicate that 17% of young men had a sperm concentration below 15 million per ml and 25% had less than 40% motile spermatozoa in their ejaculate. The rate of morphologically normal forms was below 4% in 40% of the subjects. The study as a whole revealed that at least one of the three parameters (concentration, motility and morphology) was below the WHO thresholds for 60% of men, and that 5% had a problem concerning these three factors at the same time. “We need to be cautious about a single semen analysis,” points out Dr Alfred Senn, an andrologist and co-author of the study. “It isn’t entirely predictive of a person’s fertility. But, in overall terms, the results suggest that the sperm quality of young men in Switzerland is in a critical state and that their future fertility will in all likelihood be affected.”

The study did not identify differences in sperm quality between Switzerland’s various geographical regions, linguistic areas, as a proxy for different lifestyle factors. There was also no differences between urban or rural regions. However, maternal smoking during pregnancy was found to be associated with a decrease in sperm quality, as professor Nef adds: “Subfertility was found to be more common among men who were exposed to maternal smoking during embryonic development.”

Is there a link between sperm quality and testicular cancer?

The Geneva-based researchers also used the study to identify a correlation between poor semen quality and increased testicular cancer in Switzerland. “For 35 years, testicular cancer has grown steadily to over 10 cases per 100,000 men, which is very high compared to other European countries. Sperm quality is generally lower in countries where the incidence of testicular cancer is high,” says professor Nef. This is almost certainly the result of altered testicular development at the foetal stage, prompting the scientists to further investigate this area.

The UNIGE researchers are now working to identify the causes by further assessing the impact of environmental or lifestyle factors. “We would also like to go back to the 2,523 men who took part in the study in about 10 years so we can follow up their reproductive health and find out whether they have had children or have suffered from testicular cancer, for example,” continues Rita Rahban. “With the current trend for couples to have children later in life, the low sperm count among young men in Switzerland – combined with the declining fertility of older women – will have an impact on conception rates and future generations. This will lead to significant social and financial challenges for our society,” concludes Dr Senn.

A long-term study conducted with the support of multiple partners across Switzerland


The study is the end result of a partnership of over 15 years involving numerous stakeholders, who have often been volunteers. Their number includes researchers from UNIGE, Denmark and France; the FABER Foundation that initiated this study and various andrology centres throughout Switzerland; the National Institute for Cancer Epidemiology and Registration (NICER); logistical support from the Swiss Army; the Swiss Centre for Applied Human Toxicology (SCAHT); the HUG Foundation in Geneva; and the Swiss National Science Foundation (PNR50).

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