Extremely Low Frequency

Study links asthma to magnetic-field exposure of pregnant moms

The study was conducted by the same researcher who made waves in 2002 with a study that suggested magnetic fields could boost a woman’s chances of miscarriage.

But many experts aren’t convinced the risks are real and the medical field remains sharply divided over the presence of a link between health problems and exposure to electromagnetic fields.

Magnetic and electric fields are areas of energy around electrical devices and, in combination, are referred to as electromagnetic fields. Previous research has suggested EMFs may be linked to some types of cancer and other health problems, such as miscarriages, poor semen quality and immune disorders.

EMFs emitted by power lines and home appliances, such as microwave ovens, hairdryers and vacuum cleaners, are referred to as “extremely low frequency” and should not be confused with devices such as cellphones, which emit higher-frequency EMFs called radiofrequency.

The potential health effects of radiofrequency fields are typically a source of greater concern among medical experts, particularly for cellphones and brain cancer.

But De-Kun Li Division of Research in Oakland, Calif., says he believes magnetic fields are being overlooked as a potentially serious risk to health.

In his new study, Dr. Li and colleagues tracked pregnant women and their offspring for up to 13 years to assess the possible effects of magnetic fields on health.

Women involved in the study wore a small meter during pregnancy to measure their daily exposure to magnetic fields, which are emitted by microwaves, vacuum cleaners, fluorescent lights and power lines. The meters were equipped to measure only magnetic-field exposure, not electric-field exposure.

Researchers tracked, for a maximum of 13 years, 626 children who were subsequently born to the women wearing the meters. Of those children, 130, or about 20 per cent, were clinically diagnosed with asthma.

They found women exposed to the highest levels of exposure to magnetic fields had a 3.5-fold increased risk of having a child who would later be diagnosed with asthma, compared to women with lower exposure levels.

The researchers also found women who had asthma or who were pregnant with their first child, two known risk factors for asthma in offspring, were more likely to have a child with asthma if they also had high levels of magnetic-field exposure. Dr. Li says this confirms the idea that magnetic fields can potentially lead to asthma in offspring.

Extech 480823 Electromagnetic Field and Extremely Low Frequency ...

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