Assessment of Health Risks of Intermediate Frequency Magnetic Fields
Health effects of electromagnetic fields have been studied mainly focusing on extremely low frequency magnetic fields and radio frequency fields. Less attention has been paid to intermediate frequency magnetic fields (IF MFs) even though number of applications is increasing and information on potential health effects is sparse. We are conducting a series of studies to assess the exposure to IF MFs and the consequences of exposure.
Based on our measurements near electronic article surveillance (EAS) devices, cashiers are a group with exceptional IF MF exposure. Reproductive health effects are studied among female cashiers in an epidemiological study.
Behavioural and cognitive effects in mice exposed to 7.5 kHz MF were assessed. Post-mortem histochemical analyses were also performed. Blood cell samples from animals exposed to IF MFs are being assayed for genotoxicity. Male fertility indicators were measured in exposed mice. A behavioural teratology study is being conducted: mice are exposed to IF MFs in utero and the pups are tested for cognitive effects.
In vitro studies were performed with rat primary astrocytes. Cells were exposed to a vertical 7.5 kHz MF. DNA damage and DNA repair, and micronucleus formation were analyzed. To assess joint effects, genetic damage was induced with two known genotoxic agents. Selected endpoints were measured immediately after exposure and 36 days after exposure to assess induced genomic instability.
No adverse effects of IF MFs were observed on fertility in male mice or genotoxicity in cell cultures. However, interesting findings indicating protective effects were observed, which need to be confirmed in further studies. The behavioural studies suggested impaired spatial learning and memory. The behavioural teratology study, in vivo genotoxicity and the epidemiological study are still ongoing. Assessment of health risks will be done when all results are available.
Keywordsintermediate frequency magnetic fields exposure assessment genotoxicity reproductivity behavioural effects
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- 1. IARC (2002) Non-Ionizing Radiation, Part 1: Volume 80. International Agency for Research on Cancer, Lyon.Google Scholar
- 2. IARC (2013) Non-Ionizing Radiation, Part 2: Volume 102. International Agency for Research on Cancer, Lyon.Google Scholar
- 3. Ahlbom A et al. (2008) Possible effects of electromagnetic fields (EMF) on human health—Opinion of the Scientific Committee on Emerging and Newly Identified Health Risks (SCENIHR). Toxicology 246: 248-250Google Scholar
- 4. Litvak E et al. (2002) Health and safety implications of exposure to electromagnetic fields in the frequency range 300 Hz to 10 MHz Bioelectromagnetics 23: 68-82Google Scholar
- 5. Roivainen P et al. (2014) Occupational exposure to intermediate frequency and extremely low frequency magnetic fields among personnel working near electronic article surveillance systems. Bioelectromagnetics 35: 245-250Google Scholar
- 6. Kumlin T et al. (2007) Mobile Phone Radiation and the Developing Brain: Behavioral and Morphological Effects in Juvenile Rats. Radiat Res 168, 471–479.Google Scholar
- 7. Höytö A et al. (2007) Ornithine decarboxylase activity is affected in primary astrocytes but not in secondary cell lines exposed to 872 MHz RF radiation. Int J Radiat Biol 83:367-374.Google Scholar
- 8. Luukkonen J et al. (2011) Pre-exposure to 50 Hz magnetic fields modifies menadione-induced genotoxic effects in human SHSY5Y neuroblastoma cells. PLoS ONE 6:e18021.Google Scholar