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[考试辅导] 医学考博每日一读:

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发表于 2012-7-20 22:52:00 | 显示全部楼层 |阅读模式
医学考博每日一读:'No evidence' of harm by mobiles3 h, l- {5 f( c$ b" A
There is still no evidence mobile phones harm human health, says a major safety review for the UK's Health Protection Agency (HPA).
) k: Z4 y1 J, J8 r# NScientists looked at hundreds of studies of mobile exposure and found no conclusive links to cancer risk, brain function or infertility.
8 k* B" Y) _+ e4 x! k) ~However, they said monitoring should continue because little was known about long-term effects.# e+ y. i; |+ j' q$ d0 K
The HPA said children should still avoid excessive use of mobiles.
- o# h5 M' F$ LIt is the biggest ever review of the evidence surrounding the safety of mobile phones.
0 o" T# y$ S) P$ l7 m% MThere are now an estimated 80 million mobiles in the UK, and because of TV and radio broadcasting, Wi-Fi, and other technological developments, the study said exposure to low-level radio frequency fields was almost universal and continuous.- B% K. G9 Q' ~) F6 ?$ U
A group of experts working for the HPA looked at all significant research into the effects of low-level radio frequency.
! k. @& \# J( i; v$ i'Relatively reassuring'
* i+ O+ m1 ^& T; H$ DThey concluded that people who were not exposed above UK guideline levels did not experience any detectable symptoms.
  V) H- [' \4 k6 r+ G- z; _" d: \% rThat included people who reported being sensitive to radio frequency. : j$ t- l" a4 K! L9 g7 Q
They also said there was no evidence that exposure caused brain tumours, other types of cancer, or harm to fertility or cardiovascular health.! r6 I4 m8 N$ K3 C' w# U! X9 F8 J
But they said very little was known about risks beyond 15 years, because most people did not use mobile phones until the late 1990s.
9 B- f9 [4 ?* s& \  kProf Anthony Swerdlow, who chaired the review group, said it was important to continue monitoring research.( u& L( u0 T0 H/ ~" v
"Even though it's relatively reassuring, I also think it's important that we keep an eye on the rates of brain tumours and other cancers," he said. 7 X: G. F9 d1 `, T: V4 V& k
"One can't know what the long-term consequences are of something that has been around for only a short period."
: w: s2 r1 A7 \! @( e1 i. z, f( \- nThere has been speculation about the health effects of using mobile phones for years.
+ R# R* G1 Z1 yThe HPA conducted a previous review in 2003, which also concluded that there was no evidence of harm. But there is now far more research into the subject. 8 j% m5 R1 S- s
Advice on children& A- l2 A3 k$ Z( m' a4 y$ n' d
The experts said more work was needed on the effect of radio frequency fields on brain activity, and on the possible association with behavioural problems in children.
& L7 w9 h  U/ _6 j$ ^: HThey also called for more investigation into the effects of new technology which emits radio frequency, such as smart meters in homes and airport security scanners.( p% F! r7 k# D# W0 t3 b' L
The HPA said it was not changing its advice about mobile phone use by children.
- h5 Z0 a0 _+ f" i0 T"As this is a relatively new technology, the HPA will continue to advise a precautionary approach," said Dr John Cooper, director of the HPA's centre for radiation, chemical and environmental hazards.8 m' O( J, \" v% I. b: V
"The HPA recommends that excessive use of mobile phones by children should be discouraged."
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