Journal
NEUROREPORT
Volume 11, Issue 15, Pages 3321-3325Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200010200-00012
Keywords
electromagnetic exposure; global system for mobile communication (GSM) mobile phones; non-RPM sleep; sleep spindles; spectral analysis
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The aim of the study was to investigate whether the electromagnetic field (EMF) emitted by digital radiotelephone handsets affects brain physiology. Healthy, young male subjects were exposed for 30 min to EMF (900 MHz; spatial peak specific absorption rate 1 W/kg) during the waking period preceding sleep. Compared with the control condition with sham exposure, spectral power of the EEG in non-rapid eye movement sleep was increased. The maximum rise occurred in the 9.75- 11.25 Hz and 12.5-13.25 Hz band during 1:he initial part of sleep. These changes correspond to those obtained in a previous study where EMF was intermittently applied during sleep. Unilateral exposure induced no hemispheric asymmetry of EEG power. The present results demonstrate that exposure during waking modifies the EEG during subsequent sleep. Thus the changes of brain function induced by pulsed high-frequency EMF outlast the exposure period. NeuroReport 11:3321-3325 (C) 2000 Lippincott Williams & Wilkins.
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