The chronic exposure to radiofrequency electromagnetic fields modified the thermopreferendum during sleep in juvenile rats

Abstract : Sleep disturbances by radiofrequency electromagnetic fields (RF-EMF) emitted by mobile phone base stations type GSM are not well-known. In a previous study, we pointed out that most effects of RF-EMF on sleep were dependent on the thermal environment, suggesting that RF-EMF exposure may modify sleep through interactions with thermoregulatory processes. In the present study, juvenile rats exposed to RF-EMF were allowed to choose their thermal environment corresponding to the thermopreferendum. Sleep was scored as comfort criteria. Six wistar rats (3 weeks-old) exposed to RF-EMF (900 MHz, 1 V/m) during 5 weeks were compared to a non-exposed group (n=4). One week after surgery, sleep was measured (wireless) during the day when animals were allowed to move freely between 3 similar communicated rooms which differ according to their ambient temperatures (24 °C, 28 °C and 31 °C). Wakefulness (W), Slow Wave (SWS) and Paradoxical Sleep (PS) were scored at 10 second-periods. The time spent in each room, the total durations of sleep stages, the mean durations of episodes and their frequencies were tested using Mann-Whitney and Wilcoxon. Exposed rats preferred to sleep at 31 °C whereas the controls preferred 28 °C. At 31 °C, the total time sleep was increased (+139 min and +103 min compared to 24 °C and 28 °C respectively, p<0.05) as a result of longer total durations of SWS (compared to 24 °C: +107 min, p<0.05) and of PS (compared to 24 °C and 28 °C: +10 min and +7 min respectively, p<0.05). The frequencies of SWS and PS episodes also increased at 31°C compared to 24 °C (SWS: +167 % and PS : +111 %, p<0.05). In sleeping rats, the thermopreferedum was increased by chronic exposure to RF-EMF. The increased sleep duration suggests that the animals exposed to RF-EMF may develop behavioral responses to prevent energy expenditure.
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  • HAL Id : ineris-00971051, version 1
  • INERIS : EN-2012-310

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Amandine Pelletier, Stéphane Delanaud, Jean-Pierre Libert, Véronique Bach, Gyorgy Thuroczy, et al.. The chronic exposure to radiofrequency electromagnetic fields modified the thermopreferendum during sleep in juvenile rats. 21. Congress of the European Sleep Research Society (ERS), Sep 2012, Paris, France. ⟨ineris-00971051⟩

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