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Cochrane finds no reliable evidence on effectiveness of electric fans in heatwaves
Date:7/11/2012

A new Cochrane systematic review of the effects of electric fans in heatwaves has found no high quality evidence to guide future national and international policies. The review outlines the type of study that would help resolve the uncertainty which is spelt out in a podcast and an editorial all published today in The Cochrane Library.

Heatwaves in Europe and the USA have led to increasing interest in health protection measures to reduce the impacts of such extreme weather events on human health. Heatwaves are also an issue for mass gatherings and heatwave planning has been incorporated into the preparation for the London Olympics beginning this month.

One way to try to get relief from the heat is to use an electric fan, but health experts have questioned whether this will do more harm than good. A fan might help to increase heat loss if the temperature is below 35C and the fan is not directly aimed at the person, but, when temperatures are above 35 C, the fan might actually contribute to heat gain. Excess sweating can also lead to dehydration and other health problems.

One of the review authors, Dr Saurabh Gupta, a consultant in public health at Hertfordshire Community NHS Trust in the UK, said: "It is important, to know about the potential benefits and harms of electric fans when choosing whether to use one. This is true if you are simply making a decision about your own use of a fan, but it also applies to broader public health decisions, such as whether to give electric fans to groups of people during a heatwave.

"This is particularly important for people who are considered more vulnerable to the effects of heat, such as older adults who are less able to cool down through sweating or increasing the flow of blood to their skin."

The Cochrane researchers tried to provide some of the answers that would help decision makers. Introducing the review, they write: "We looked for high quality research that had co
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Contact: Jennifer Beal
sciencenewsroom@wiley.com
44-012-437-70633
Wiley
Source:Eurekalert

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