Authors
Paredi P, Kharitonov SA, Hanazawa T, Barnes PJ (2001)

Eleven normal subjects were studied while making a 30-minute phone call using a digital cellular phone (900 MHz). During the call, measurements were made of skin temperature, nasal nitric oxide (NO), and nasal minimal cross-sectional area (MCA). Nitric oxide is involved in vasodilatation of the skin. There was a significant temperature increase (maximal 2.3°C) in the occipital region and in the nostril on the same side as the telephone was used. There was a small but not statistically significant increase in NO levels that was maximal at 10 minutes and returned to normal by the end of the call. The MCA was significantly reduced at 15 minutes into the call.

Five subjects were tested "using an earpiece with the mobile phone 45 cm from the skin surface of the face avoiding direct exposure of the subjects to the EMF, and with the mobile phone in the switched off position to exclude changes in temperature resulting from the hand holding the phone or the conducted/reflected heat between the skin and the phone". No changes were seen in the measurements. It is not clear from the description of the control experiments whether they were done with the subject holding the phone to the ear but with the phone switched off. Clearly there is a need to do a randomized study where the measurements would be made while the subjects held a phone to their ear with the phone either on or off, and the subjects unaware of the status of the EMF exposure.



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