title: Different effects of chronic exposure to ELF magnetic field on spontaneous and amphetamine-induced locomotor and stereotypic activities in rats.
abstract: The effects of chronic (7 days) exposure to an extremely low frequency magnetic field (ELF-MF, 50 Hz, 0.5 mT) on spontaneous and amphetamine-induced (1.5mg/kg, i.p.) locomotor and stereotypic activities in adult rats were examined by open field test for 2h on exposure days 1, 3, and 7. After 1 day of exposure to ELF-MF, the spontaneous locomotor activity was increased clearly at the first hour of observation and significantly at the second one as compared to the corresponding values in other series with ELF-MF and sham-exposed animals. After 7 days of exposure to ELF-MF, an amphetamine enhancing effect on the locomotor activity was significantly reduced at the second hour of observation as compared to that in 1-day- and sham-exposed rats treated with amphetamine. In contrast to the locomotor activity, the amphetamine-induced stereotypic behaviour in 7-day pre-exposed rats was significantly reduced at the first hour versus sham-exposed rats. While at the second hour of observation this effect was significant as compared to 1- and 3-day exposed animals (but not sham-exposed rats). Our results indicate that an extremely low frequency magnetic field is able to affect differently two types of behaviour, which are dependent on both the time course of exposure and the imbalance in the brain mediatory systems.
authors.affiliation: Laboratory of Electrophysiology and Behaviour, Department of Neurobiology and Immunology, Institute for Biological Research, Bulevar Despota Stefana 142, 11060 Belgrade, Serbia and Montenegro. janac@ibiss.bg.ac.yu
authors.forename: Branka
authors.initials: B
authors.lastname: Janać
authors.forename: Vesna
authors.initials: V
authors.lastname: Pesić
authors.forename: Ankica
authors.initials: A
authors.lastname: Jelenković
authors.forename: Vasily
authors.initials: V
authors.lastname: Vorobyov
authors.forename: Zlatko
authors.initials: Z
authors.lastname: Prolić
mesh_terms: D000661:Amphetamine / Q000494:pharmacology*; D000818:Animals; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D004574:Electromagnetic Fields; D008297:Male; D009043:Motor Activity / Q000187:drug effects / Q000528:radiation effects*; D051381:Rats; D017208:Rats, Wistar; D013239:Stereotyped Behavior / Q000187:drug effects / Q000528:radiation effects*; D013997:Time Factors
chemical_list: D000697:Central Nervous System Stimulants; D000661:Amphetamine