Effects of Electromagnetic Fields with Frequencies Lower Than 50 Hz and Intensity of 50 μT on Learning and Memory

Authors

  • Asad-Allah Zarifkar Associate Professor, Physiology Dept., Shiraz University of Medical Sciences, Shiraz, Iran
  • Gholamreza Hamzavi M.Sc. In Physiology, Physiology Dept., Shiraz University of Medical Sciences, Shiraz, Iran
  • Karim Rastegar Associate Professor, Physiology Dept., Shiraz University of Medical Sciences, Shiraz, Iran
  • Mehdi Movahedi Instructor, Medical Physics Dept., Shiraz University of Medical Sciences, Shiraz, Iran
Abstract:

Introduction: Biological effects of magnetic fields have been investigated by scientists for many years and a vast amount of research using different frequencies and intensities have been performed on humans and laboratory animals. The results of these studies, which have mostly been done by applying high frequencies, have shown that electromagnetic fields are effective on structure and function of biological systems. Material and Methods: Sixty male Sprague Dawly rats were randomly divided into 6 groups of ten each. The first group was sham exposed and the other groups were exposed to fields with frequencies of 5, 10, 15, 25 and 40 Hz and intensity of 50 μT. To investigate the effects on learning, 20 trials were undertaken for each animal using a shuttle box that was sandwiched between the arms of the field generator, which was adjusted to produce the desired frequency and intensity. To evaluate the reversibility of the possible effects of the fields and also to evaluate memory, the 20 trials were repeated 24 hours later under the same condition but in the absence of the field. In this study, we measured the latency and number of conditioning responses. Results: According to our findings, a significant difference was found between latency and number of conditioning responses of the second day of the 25 Hz group and the sham and other experimental groups. For that group, latency increased and number of conditioning responses decreased on the second day compared to the first day, in contrast to all other groups.                                                                                                                               Conclusion: Exposure to the field with frequency of 25 Hz caused disruption of memory, however, there was no significant difference between the groups regarding learning.  

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

effects of electromagnetic fields with frequencies lower than 50 hz and intensity of 50 μt on learning and memory

introduction: biological effects of magnetic fields have been investigated by scientists for many years and a vast amount of research using different frequencies and intensities have been performed on humans and laboratory animals. the results of these studies, which have mostly been done by applying high frequencies, have shown that electromagnetic fields are effective on structure and functio...

full text

Biological effects of prolonged exposure to ELF electromagnetic fields in rats: III. 50 Hz electromagnetic fields.

Groups of adult male Sprague Dawley rats (64 rats each) were exposed for 8 months to electromagnetic fields (EMF) of two different field strength combinations: 5microT - 1kV/m and 100microT - 5kV/m. A third group was sham exposed. Field exposure was 8 hrs/day for 5 days/week. Blood samples were collected for hematology determinations before the onset of exposure and at 12 week intervals. At sac...

full text

The Study of ECG Changes in Humans Exposed to 50 Hz Electromagnetic Fields

Introduction: It has been reported that cardiovascular effects are among the possible health effects of being exposed to extremely low frequency electromagnetic fields (ELF EMSs). Material and Methods: This study has been conducted to evaluate the long term effects of exposure to magnetic and electric fields on electrocardiogram signal changes. Nine power transmission posts having different vol...

full text

the effects of keyword and context methods on pronunciation and receptive/ productive vocabulary of low-intermediate iranian efl learners: short-term and long-term memory in focus

از گذشته تا کنون، تحقیقات بسیاری صورت گرفته است که همگی به گونه ای بر مثمر ثمر بودن استفاده از استراتژی های یادگیری لغت در یک زبان بیگانه اذعان داشته اند. این تحقیق به بررسی تاثیر دو روش مختلف آموزش واژگان انگلیسی (کلیدی و بافتی) بر تلفظ و دانش لغوی فراگیران ایرانی زیر متوسط زبان انگلیسی و بر ماندگاری آن در حافظه می پردازد. به این منظور، تعداد شصت نفر از زبان آموزان ایرانی هشت تا چهارده ساله با...

15 صفحه اول

Neurovegetative disturbances in workers exposed to 50 Hz electromagnetic fields.

OBJECTIVES Since the circulatory and nervous systems are composed of electrically excitable tissues, it is plausible that they can be stimulated by electromagnetic fields (EMF). No clinical studies have as yet been carried out to explain whether and how occupational exposure to 50 Hz EMF can influence the neurovegetative regulation of the cardiovascular function. The present project was underta...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 6  issue 2

pages  19- 26

publication date 2009-06-01

By following a journal you will be notified via email when a new issue of this journal is published.

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023