The low frequency electromagnetic field on the rat EEG

Abstract

The aim of the present study was to find out the effects of low frequency electromagnetic field (EMF) 50 Hz -10 mT on the rat electroencephalogram (EEG) recorded from the rat brain cortex and from the skull surface. The rats were, whole body, exposed to this EMF intensity one hour daily for 7 days. Recovery study was done after one week from stopping the EMF exposure. The effects of the filed were estimated by compression of the averaged EEG frequency spectra in the range of frequencies between 0.2 -0.7 Hz and by comparison of amplitude of EEG waves in control, exposed to EMF and recovery animals. Statistically significant effects of EMF were observed both in EEG amplitude and power reduction at most EEG frequencies. Also, noticeable variations were observed in normal values of maximum amplitude and number of successive EEG epochs recorded from brain and skull surfaces after exposure to ELF magnetic fields. These results show that a weak low EMF can influence the spontaneous electrical rat brain activity in the animals subjected to the EMF.

Modulation of biphasic pattern of cortical reorganization in spinal cord transected rats by external magnetic fields

“…MF exposure for 32 days resulted in improvement of the cortical electrical activity of the brain which can be attributed to the effect of magnetic field on primarily Ca 2+ ion which causes changes in the rate of calmodulin dependent phosphorylation of myosin or due to K + dependent biochemical pathways which are known to play a significant role in the regulation of the cellular activity. This is also due to the effect of MF on the cell membrane, causing depolarization and altering the permeability to ions (Shuvalova et al, 1991; Markov et al, 1993; Vorobyov et al, 1998; Mathie et al, 2003; Linda et al, 2009; Sallam 2012). Blank and Soo (1998) established that 50 Hz magnetic fields upregulate the activity of Na, K-ATPase and the cytochrome oxidase’s rate constant.…”

Modulation of biphasic pattern of cortical reorganization in spinal cord transected rats by external magnetic fields

“…MF exposure for 32 days resulted in improvement of the cortical electrical activity of the brain which can be attributed to its effect on primarily Ca 2+ ion which causes changes in the rate of calmodulin dependent phosphorylation of myosin or K + dependent biochemical pathways which are known to play a signi cant role in the regulation of the cellular activity. This can also be due to the effect of MF on the cell membrane, causing depolarization and altering the permeability to ions [21,22].…”