• Neuroscience · Sep 2017

    Selective changes in locomotor activity in mice due to low-intensity microwaves amplitude modulated in the EEG spectral domain.

    • Van Eeghem Vincent V Department of Electronics and Informatics (ETRO), Laboratory for micro- and photon electronics (LAMI), Vrije Universiteit Brussel, Pleinlaan 2, 1050 , Anissa El Arfani, Arta Anthoula, Laura Walrave, Ali Pourkazemi, Eduard Bentea, Thomas Demuyser, Ilse Smolders, and Johan Stiens.
    • Department of Electronics and Informatics (ETRO), Laboratory for micro- and photon electronics (LAMI), Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium. Electronic address: vvaneegh@etrovub.be.
    • Neuroscience. 2017 Sep 17; 359: 40-48.

    AbstractDespite the numerous benefits of microwave applications in our daily life, microwaves were associated with diverse neurological complaints such as headaches and impaired sleep patterns, and changes in the electroencephalogram (EEG). To which extent microwaves influence the brain function remains unclear. This exploratory study assessed the behavior and neurochemistry in mice immediately or 4weeks after a 6-day exposure to low-intensity 10-GHz microwaves with an amplitude modulation (AM) of 2 or 8Hz. These modulation frequencies of 2 and 8Hz are situated within the delta and theta-alpha frequency bands in the EEG spectrum and are associated with sleep and active behavior, respectively. During these experiments, the specific absorbance rate was 0.3W/kg increasing the brain temperature with 0.23°C. For the first time, exposing mice to 8-Hz AM significantly reduced locomotor activity in an open field immediately after exposure which normalized after 4weeks. This in contrast to 2-Hz AM which didn't induce significant changes in locomotor activity immediately and 4weeks after exposure. Despite this difference in motor behavior, no significant changes in striatal dopamine (DA) and 3,4-dihydroxyphenylacetic acid (DOPAC) levels and DOPAC/DA turnover nor in cortical glutamate (GLU) concentrations were detected. In all cases, no effects on motor coordination on a rotarod, spatial working memory, anxiety nor depressive-like behavior were observed. The outcome of this study indicates that exposing mice to low-intensity 8-Hz AM microwaves can alter the locomotor activity in contrast to 2-Hz AM which did not affect the tested behaviors.Copyright © 2017 IBRO. Published by Elsevier Ltd. All rights reserved.

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