Wireles Laptop Computers Decreases Human Sperm Motility. Damages DNA -- New Study
This is now the 4th Study to Confirm this. So, Let's keep putting wi fi in all the schools and while in coffee houses, be sure you keep the lap top on your laps. We need some two headed kids to break the monotony.
Use of laptop computers connected
to internet through Wi-Fi decreases
human sperm motility and increases
sperm DNA fragmentation
Conrado Avenda~no, M.S.,a Ariela Mata, M.S.,a Cesar A. Sanchez Sarmiento, M.D., Ph.D.,a
and Gustavo F. Doncel, M.D., Ph.D.b
a Nascentis Medicina Reproductiva, Cordoba, Argentina; and b CONRAD, Department of Obstetrics and Gynecology, Eastern Virginia Medical
School, Norfolk, Virginia
Objective: To evaluate the effects of laptop computers connected to local area networks wirelessly (Wi-Fi) on human spermatozoa.
Design: Prospective in vitro study.
Setting: Center for reproductive medicine.
Patient(s): Semen samples from 29 healthy donors.
Intervention(s): Motile sperm were selected by swim up. Each sperm suspension was divided into two aliquots. One sperm aliquot (experimental) from
each patient was exposed to an internet-connected laptop by Wi-Fi for 4 hours, whereas the second aliquot (unexposed) was used as control, incubated
under identical conditions without being exposed to the laptop.
Main Outcome Measure(s): Evaluation of sperm motility, viability, and DNA fragmentation.
Result(s): Donor sperm samples, mostly normozoospermic, exposed ex vivo during 4 hours to a wireless internet-connected laptop showed a significant
decrease in progressive sperm motility and an increase in sperm DNA fragmentation. Levels of dead sperm showed no significant differences between the
Conclusion(s): To our knowledge, this is the first study to evaluate the direct impact of laptop use on human spermatozoa. Ex vivo exposure of human
spermatozoa to a wireless internet-connected laptop decreased motility and induced DNA fragmentation by a nonthermal effect. We speculate that
keeping a laptop connected wirelessly to the internet on the lap near the testes may result in decreased male fertility. Further in vitro and in vivo
studies are needed to prove this contention. (Fertil Steril 2012;-:---. 2012 by American Society for Reproductive Medicine.)
Key Words: Laptop computer, Wi-Fi, sperm quality, fertility, sperm DNA fragmentation
In recent years, the use of portable
computers (laptops, connected to
local area networks wirelessly, also
known as Wi-Fi) has increased dramatically.
Laptops have become indispensable
devices in our daily life, offering
flexibility and mobility to users. People
using Wi-Fi may be exposed to radio
signals absorbing some of the transmitted
energy in their bodies. Portable
computers are commonly used on the
lap (1-3), therefore exposing the
genital area to radio frequency
electromagnetic waves (RF-EMW) as
well as high temperatures (3, 4).
Infertility is a common worldwide
condition that affects more than 70
million couples of reproductive age
(5). It has been suggested that male fertility
has declined during the past several
decades (6). Such decline has been
attributed to the direct or indirect exposure
to certain environmental factors
such as RF-EMW (7).
Extremely low frequency magnetic
fields can initiate a number of biochemical
and physiological alterations in
biological systems of different species
(8-12). Many of these effects have been
associated with free-radical production
(13, 14). Free radicals are causative
factors of oxidative damage of cellular
structures and molecules such as lipids,
proteins, and nucleic acids. Free radicals
react with polyunsaturated fatty
acids in cell membranes promoting
a process called lipid peroxidation. In
human spermatozoa the presence of
unesterified polyunsaturated fatty acids
is causally associated with the induction
of reactive oxygen species (ROS)
generation and lipid peroxidation (15).
Damage may occur at the membrane
level, leading to immotility and cell
death, or at the DNA level. DNA integrity
is essential to normal conception.
Sperm DNA fragmentation has been
associated with impaired fertilization,
poor embryonic development, high
rates of miscarriage, and increased
incidence of morbidity in the offspring,
including childhood cancer (16, 17). It
has been proposed that genetic and
Received June 14, 2011; revised September 9, 2011; accepted October 11, 2011.
C.A. has nothing to disclose. A.M. has nothing to disclose. C.A.S.S. has nothing to disclose. G.F.D. has
nothing to disclose.
Reprint requests: ConradoAvenda~no,M.S.,NascentisMedicina Reproductiva,Montevideo 359, Cordoba,
Cordoba X5000AXA, Argentina (E-mail: firstname.lastname@example.org or andrologiachubut@yahoo.
Fertility and Sterility® Vol. -, No. -, - 2012 0015-0282/$36.00
Copyright ©2012 American Society for Reproductive Medicine, Published by Elsevier Inc.
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