to stress not affected by RF radiation
There have been
reports of abnormal responses to stress in humans and animals exposed
to RF radiation. A recent study from California has shown that this
response might be related to factors other than the radiation. Stress-related
responses including core body temperature, blood levels of adrenocorticotrophic
hormone (ACTH) and corticosterone, and brain levels of ornithine
decarboxylase and Fos and Jun mRNAs were studied in rats. There
were significant stress responses in the animals when they were
immobilised in the manner necessary for near-field experiments with
RF radiation. There was no further increase in the stress responses
after exposure to pulse-modulated fields at 1.6 GHz, and there were
no differences between RF-irradiated and sham-exposed animals. RF
fields at SARs up to 5 W/kg were used.
This study suggests
that responses attributed to RF radiation may be due to the conditions
of the laboratory experiment rather than the radiation.
Stagg RB, Hawel LH, Pastorian K, Cain C, et al. Effect of immobilization
and concurrent exposure to a pulse-modulated field on core body
temperature, plasma ACTH and corticosteroid, and brain ornithine
decarboxylase, Fos and Jun mRNA. Radiation Research 2001;155:584-592.
effect on brain cancer in rats from RF radiation.
11, we review animal experiments that have examined the effect
of RF radiation on cancer rates. Now another study has reported
that 860 MHz radiation failed to induce tumours in rats. In addition
there was no evidence that rats pretreated with ENU, a cancer-producing
agent, developed tumours at a higher rate when exposed to the radiation,
compared with controls.
Zook BC, Simmens SJ. The effects of 860 MHz radiofrequency radiation
on the induction or promotion of brain tumours and other neoplasms
in rats. Radiation Research 2001;155:572-583.
phone users do better on attention tests
A recent report
from Hong Kong showed that a group of teenagers who were mobile
phone users did better on one of three measures of attention than
a control group who did not use mobile phones. The subjects were
not tested while using a mobile phone. The authors, and an accompanying
editorial, point out that the results could be explained by self-selection
- that is, "individuals who are better at attention-demanding
tasks are more likely to choose to use such phones".
Lee TMC, Ho SMY, Tsang LYH, Yang SYC, et al. Effect on human attention
of exposure to the electromagnetic field emitted by mobile phones.
Petrides M. Use of cellular telephones and performance on tests
of attention. NeuroReport 2001;12:A21.
on the NCI study of brain tumours
In the January
and February 2001 "What's New" we discuss the National
Cancer Institute study from the USA that examined cell phone use
and brain tumours. There is correspondence about this study in the
April 26 issue of the New England Journal of Medicine. The authors
of the study respond to three letters about the findings.
Erman M, et al; Kundi M; Kane RC; Inskip PD, et al. Cellular telephones
and brain tumors. New England Journal of Medicine 2001;344, No.