Electrical Appliances Linked To Miscarriage
Posted By Dr. Mercola | January 23 2002
Strong magnetic fields produced by trains, electric household appliances such as vacuum cleaners and food mixers and vehicles increase the risk of miscarriage by up to three times claim researchers in California.
Their findings also suggest that most previous investigations into the health effects of electromagnetic fields (EMFs) have been measuring the wrong thing.
One study was led by De-Kun Li, a reproductive epidemiologist at the Kaiser Foundation Research Institute in Oakland, California. His team asked 1063 women around San Francisco who were in the first 10 weeks of pregnancy to spend a day wearing a meter around their waists that measured magnetic field levels every 10 seconds.
Overall, they found that women exposed to peak levels of 1.6 microteslas or greater were nearly twice as likely to miscarry as women not exposed to such strong fields.
More significantly, says Li, among the 622 women who said the measuring period had been a typical day, those who experienced high peak fields were three times as likely to have a miscarriage. "That's another confirmation that the effect is due to EMF," says Li.
Shavers and Hairdryers
Other factors can have a more dramatic effect, however. The risk of a miscarriage increases tenfold as women age, for example, from 5 per cent for women under 30 years old to 50 per cent for those in their mid-40s.
Li's team didn't look at what was producing the fields, but appliances such as shavers, hairdryers and vacuum cleaners can produce strong alternating magnetic fields, as can electric vehicles such as trams and trains. The key is proximity to the source, as fields drop off rapidly with distance.
The team did not examine which appliances were producing the strong fields, but devices with powerful motors are known to be the worst culprits. Vacuum cleaners and drills emit around 20 microteslas - more than 12 times higher than the critical level in the study. Food mixers give off around 10
Alternating magnetic fields also have associated electric fields. The few previous studies of the effect of low-frequency EMFs on miscarriages, such as one involving 727 women done in 1991 by Raymond Neutra's group at the California Department of Health Services in Oakland, have been inconclusive.
But Li thinks this is because Neutra looked at people's average exposure to electromagnetic fields over time, not peak values. "People have never looked at peak EMFs before," Li says. "My study opens a new chapter for these EMF effects. Not just for miscarriages, but for other health effects."
When Neutra reanalysed the data from his earlier study, which has only now been published, he discovered the results were similar to Li's. Women exposed to peak EMF levels greater than 1.4 microteslas were nearly twice as likely to miscarry.
In the past, EMFs have been blamed for various other ill effects, especially leukemia in children. But no one can explain how relatively weak fields might cause the DNA mutations that lead to cancer, and most studies have failed to find evidence of a link.
The peak values measured by Li are way below the recommended exposure limit of 1600 microteslas. Above this level, EMFs can induce electric currents in the body, which leads to localized heating.
Li speculates that EMF spikes could cause miscarriages by subtly disrupting cell-to-cell communication. "But as epidemiologists, we should not feel weaker because we don't understand the mechanisms."
Epidemiology January 2002 13:9-20
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More compelling evidence to avoid EMFs. This is the first documentation I am aware of that stresses the importance of peak exposure and provides an explanation of a reason for other negative EMF studies.
Infrequent exposures to high intensity fields may be one of the reasons that cause the problem.
If you haven't become convinced yet of the dangers of using your cell phone, you need to review the study published in Lancet last year which shows that if cell phones were a drug, they would not be approved.