Press release

A Study Showing Mounting Evidence of Harmful Effects Of WiFi Router Electromagnetic Waves on Sperm to Be Presented at ASPIRE 2019 Congress

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A new study has provided further evidence that electromagnetic waves
from WiFi devices can have a detrimental effect on human sperm.

The outcome adds weight to concerns that the explosive spread of mobile
telephones and other devices relying on WiFi connection may be
contributing to declining fertility rates in developed countries.

The Japanese study, believed to be the first to trial a WiFi shield to
help protect sperm from the effects of electromagnetic waves, will be
reported at the Asia Pacific Initiative on Reproduction (ASPIRE 2019)
Congress in Hong Kong this week.

Researcher Kumiko Nakata, Head of the Research Division, *Reproductive
Medicine Research Centre, Yamashita Shonan Yume Clinic, said 51 male
patients at the clinic participated in the study from August to November

Each of the men, whose average age was 38.4 years, were involved in IVF
or artificial insemination procedures at the clinic.

Sperm samples were taken from the men and they were divided into three

  • a control group whose sperm samples were not exposed to EM waves from
    the WiFi router;
  • a group whose sperm was protected by a small WiFi shield that
    intercepts electromagnetic waves (EM), and
  • a group whose sperm was exposed to the EM waves.

Kumiko Nakata, whose research focus is on embryology and spermatology,
said sperm samples from participants were placed near a pocket WiFi
router similar to how a mobile phone would be carried in a man’s

Exposure to EM waves from the WiFi router occurred over periods of 30
minutes, 60 minutes, two hours and 24 hours, after which sperm motion
was accurately tested using an advanced sperm motility analysis system.

Kumiko Nakata said: “After 30 minutes activation of EM waves, the
motility rate of the control and shield group was 87 per cent, while
that of the exposed group was 88 per cent.

“After 60 minutes, there was also little difference in the sperm
motility rates across the three groups. However, after two hours
activation of EM waves, the motility rate of the control group was 53.3
per cent, the shield group was 44.9 per cent, and the exposed group was
much lower at 26.4 per cent.

“After 24 hours, the dead sperm rate of the control group was 8.4 per
cent, the shield group was 18.2 per cent, and exposed group was 23.3 per
cent, the latter being significantly higher.

“This indicates EM waves from a portable WiFi router decreases the
motile rate and increases the death rate of human sperm.

“Recently, the decrease in fecundity in developed countries has been a
matter of great concern. EM waves are said to be safe, but the shower of
them caused by WiFi devices may be a contributing factor to the
declining fertility trend.

“Our study has shown that over a relatively short time, a WiFi shield
can offer some protection from the harmful effects of the EM waves.
However, there is mounting evidence that the effects of EM waves on
sperm may be having a significant effect on human reproduction.”

The ASPIRE Congress will also be addressed by other speakers raising
concerns about declining male fertility over the past four decades.

The World Health Organisation predicts infertility among males and
females will be the third most serious condition after cancer and
cardiovascular diseases in the 21st century. In the Asia
Pacific region of four billion people, representing about 60 per cent of
the global population, the ramifications of this forecast are enormous.

The ASPIRE 2019 Congress will be held at the Hong Kong Convention and
Exhibition Centre from May 2 to 5.

* The research to be presented at the Congress by Kumiko Nakata is the
result of collaboration between the Reproductive Medicine Research
Centre at Yamashita Shonan Yume Clinic and the Faculty of Life and
Environmental Sciences at the University of Yamanashi.


To arrange an interview with Kumiko Nakata, please contact Trevor Gill,
ASPIRE 2019 Congress Media Relations, by e-mail at


Media representatives wishing to attend the Congress should contact
Trevor Gill at
to arrange accreditation.

Telephone contact with Trevor Gill in the Media Room at the Congress
venue will be advised.