review on mobile phones
In its 2000
report, the Independent Expert Group on Mobile Phones recommended
that "the issue of possible health effects from mobile phone
technology be the subject of a further review in three years time".
The UK government asked the Board oh the National Radiological Protection
Board (NRPB) to undertake this review and the Board asked its independent
Advisory Group on Non-ionising Radiation (AGNIR) to carry it out.
The review has now been published and can be read at http://www.nrpb.org/publications/documents_of_nrpb/abstracts/absd14-2.htm
In its Press
Release, the NRPB states:
"An independent Advisory Group has reviewed the evidence
for health effects from radiofrequency transmissions, especially
that published since the Stewart Report in 2000. The biological
and epidemiological evidence does not suggest cancer causation,
in particular from mobile phone use, nor any other adverse health
effect from radiofrequency exposures at levels below guidelines.
However, there are limitations to the research carried out so
far, and mobile phones have only been in widespread use for a
relatively short time. The Advisory Group concludes that there
is still a possibility that there could be health effects from
exposure to radiofrequency transmissions below guideline levels,
and continued research is needed".
a Swedish review on electromagnetic fields
Radiation Protection Authority, SSI, has appointed an international
independent expert group for electromagnetic fields and health.
The task is to follow and evaluate scientific developments and to
give advice to SSI. The group has issued its first annual report.
Its conclusions were:
"The focus of this report is on epidemiological and experimental
cancer research, blood-brain barrier and heat shock proteins.
In none of these areas have there been breakthrough results that
have warranted firm conclusions in one way or the other. It is
worth noting, however, that intense research is currently ongoing
in several countries and new data will gradually become available.
Given the complexity of the research area it is essential that
both positive and negative results be replicated before accepted.
Given the increase of new technologies, it is essential to follow
various possible health effects from the very beginning, particularly
since such effects may be detected only after a long duration,
due to the prolonged latency period of many chronic diseases.
Thus, more research is needed to address long-term exposure, as
well as diseases other than those included in the ongoing case-control
The review can
be found at www.ssi.se/english/english_news.html
effect on blood pressure from RFR exposure
Braune and colleagues
created concern in 1998 when they reported a slight increase in
the blood pressure of subjects after exposure to radiofrequency
radiation (RFR). The same authors later repeated their study, with
one change - they randomized the order of exposure to RFR and to
a sham exposure (in the first study all subjects had sham exposure
first). In their second study (Braune et al., 2002) there was no
significant difference between RFR and sham exposure. It became
clear that the minor blood pressure change occurred as a function
of time rather than as a result of RFR exposure. Now another group
of researchers has confirmed that RFR exposure for 35 minutes had
no effect on blood pressure and heart rate when compared with sham
For more, see
"Research - Clinical Experiments
- Cardiovascular effects"
Tahvanainen K, Nino J, Halonen P, Kuusela T, et al. (2004): Cellular
phone use does not acutely affect blood pressure or heart rate of
humans. Bioelectromagnetics 25:73-83.
EEG study fails to confirm findings
Krause and colleagues
have failed in an attempt to replicate the findings from their earlier
study in 2000, which showed EEG
changes in volunteers exposed to RF radiation. The only differences
on this occasion were that the present study was double blind and
the phone was attached to the left side of the subject's head, rather
than the right side.
healthy volunteers performed an auditory memory task. The EMF was
from a 902 MHz phone. The mean percentage of incorrect answers for
EMF was significantly increased. This had not been the case in the
authors' earlier study. However, all of the eight significant changes
in the earlier study were not significant in the present one. Other
changes in the present study were not seen in the 2000 study.
For more, see
"Research - Clinical - EEG studies".
Krause CM, Haarala C, Sillanmaki L, Koivisto M, et al. (2004): Effects
of electromagnetic field emitted by cellular phones on the EEG during
an auditory memory task: A double blind replication study. Bioelectromagnetics
fails to confirm RFR effect on rats' spatial memory
Cobb and colleagues
have attempted to replicate the study by Lai et al. (1994) that
showed a working memory deficit in rats exposed to 2450 MHz microwave
fields. The authors used procedures that were the same as Lai's,
"with the addition of a few minor changes to improve methodology".
Cobb and colleagues were unable to replicate Lai's results, and
found no evidence that the radiofrequency radiation affected the
rats' ability to learn the spatial memory task used in the study.
For more, see
"Research - Toxicological experiments
- brain function".
Cobb BL, Jauchem JR, Adair ER (2004): Radial arm maze performance
of rats following repeated low level microwave radiation exposure.