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Exposure to pulse-modulated radio frequency electromagnetic fields affects regional cerebral blood flow (2005)

Huber, R. ; Treyer, V. ; Schuderer, J. ; [et al.]

Oxford, UK : Blackwell Science Ltd

European journal of neuroscience 21 (2005), S. 0

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ISSN: 1460-9568

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: We investigated the effects of radio frequency electromagnetic fields (RF EMF) similar to those emitted by mobile phones on waking regional cerebral blood flow (rCBF) in 12 healthy young men. Two types of RF EMF exposure were applied: a ‘base-station-like’ and a ‘handset-like’ signal. Positron emission tomography scans were taken after 30 min unilateral head exposure to pulse-modulated 900 MHz RF EMF (10 g tissue-averaged spatial peak-specific absorption rate of 1 W/kg for both conditions) and sham control. We observed an increase in relative rCBF in the dorsolateral prefrontal cortex on the side of exposure. The effect depended on the spectral power in the amplitude modulation of the RF carrier such that only ‘handset-like’ RF EMF exposure with its stronger low-frequency components but not the ‘base-station-like’ RF EMF exposure affected rCBF. This finding supports our previous observation that pulse modulation of RF EMF is necessary to induce changes in the waking and sleep EEG, and substantiates the notion that pulse modulation is crucial for RF EMF-induced alterations in brain physiology.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1460-9568.2005.03929.x

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Sleep inducing effect of low energy emission therapy (1994)

Reite, M. ; Higgs, L. ; Lebet, J.-P. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 15 (1994), S. 67-75

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ISSN: 0197-8462

Keywords: EEG ; electroencephalography ; LEET ; electromagnetic fields ; sleep ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Physics

Notes: The sleep inducing effect of a 15 min treatment with either an active or an inactive Low Energy Emission Therapy (LEET) device emitting amplitude-modulated electromagnetic (EM) fields was investigated in a double-blind cross-over study performed on 52 healthy subjects. All subjects were exposed to both active and inactive LEET treatment sessions, with an interval of at least I week between the two sessions. LEET consists of 27.12 MHz amplitude-modulated (sine wave) EM fields emitted intrabuccally by means of an electrically conducting mouthpiece in direct contact with the oral mucosa. The estimated local peak SAR is less than 10 W/kg in the oral mucosa and 0.1 to 100 mW/kg in brain tissue. No appreciable sensation is experienced during treatment, and subjects are therefore unable to tell whether they are receiving an active or an inactive treatment. In this study the active treatment consisted of EM fields intermittently amplitude-modulated (sine wave) at 42.7 Hz for 3 s followed by a pause of 1 s during which no EM fields were emitted. During the inactive treatment no EM fields were emitted. Baseline EEGs were obtained and 15 min post-treatment EEGs were recorded and analyzed according to the Loomis classification.A significant decrease (paired t test) in sleep latency to stage B2 (-1.78 ± 5.57 min, P = 0.013), and an increase in the total duration of stage B2 (1.15 ± 2.47 min, P = 0.0008) were observed on active treatment as compared with inactive treatment. The deepest sleep stage achieved (B1 to D) following active treatment was also significantly higher than that following inactive treatment (P = 0.040). We conclude 27.12 MHz electromagnetic fields, intermittenly amplitude-modulated at 42.7 Hz, result in a significant sleep inducing effect in healthy subjects. © 1994 Wiley-Liss, Inc.

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