The influence of low-frequency magnetic field on plasma antioxidant capacity and heart rate.
Ciejka EB, Goraca A · 2009
View Original AbstractMagnetic field exposure duration matters: 14 days of 40 Hz fields slowed heart rate and altered cellular antioxidant defenses in rats.
Plain English Summary
Researchers exposed rats to 40 Hz magnetic fields (7 mT strength) for different durations and measured heart rate and antioxidant levels in blood. They found that 14 days of exposure slowed heart rate and changed the body's antioxidant defenses, with effects varying based on daily exposure time (30 vs 60 minutes). The study shows that magnetic field exposure duration affects cardiovascular function and cellular protection systems.
Why This Matters
This research demonstrates that extremely low frequency magnetic fields can measurably alter cardiovascular function and cellular antioxidant systems. The 7 mT exposure level used here is significantly higher than typical household magnetic fields (which range from 0.01-0.2 mT), but it's within the range of occupational exposures for some workers near heavy electrical equipment. What makes this study particularly significant is that it shows duration-dependent effects - the same magnetic field produced different biological responses depending on whether animals were exposed for 30 or 60 minutes daily. The finding that heart rate decreased after 14 days of exposure adds to growing evidence that ELF magnetic fields can influence cardiovascular function. The changes in antioxidant capacity suggest these fields may be creating oxidative stress in cells, forcing the body to respond with protective mechanisms.
Exposure Details
- Magnetic Field
- 7 mG
- Source/Device
- 40 Hz
- Exposure Duration
- 30 and 60 minutes
Exposure Context
This study used 7 mG for magnetic fields:
- 350Kx above the Building Biology guideline of 0.2 mG
- 70Kx above the BioInitiative Report recommendation of 1 mG
Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.
Where This Falls on the Concern Scale
Study Details
The aim of the study was to check whether a time-variable magnetic field of constant frequency and induction affects the heart rate and plasma antioxidant capacity.
The tests were performed on Spraque-Dawley rats exposed to the magnetic field of the following param...
A significant decrease of the heart rate was observed after 14 days of exposure. A variable magnetic...
The exposure time affects heart rate, plasma antioxidant capacity and the organism defense ability against free radicals.
Show BibTeX
@article{eb_2009_the_influence_of_lowfrequency_335,
author = {Ciejka EB and Goraca A},
title = {The influence of low-frequency magnetic field on plasma antioxidant capacity and heart rate.},
year = {2009},
url = {https://europepmc.org/article/med/20141054},
}