Magnets show some effect on pain

Scientists say sleeping on magnetic pads helps ease rheumatism pain

March 04, 2001|By ASCRIBE NEWS SERVICE

CHARLOTTESVILLE, Va. - University of Virginia researchers have found that sleeping on magnetic pads may bring a reduction of pain from rheumatism.

The results of the university's clinical research study on magnet therapy for pain were published recently in the Journal of Alternative and Complementary Medicine.

Although the results of the study were inconclusive, magnet therapy reduced fibromyalgia pain intensity enough in one group of study participants to be "clinically meaningful," the researchers said.

The study was conducted with partial support from a grant from the National Institutes of Health Center for Complementary and Alternative Medicine.

"Fibromyalgia is a common rheumatological condition for which there is no generally effective treatment," said the study's principal investigator, Dr. Alan P. Alfano, assistant professor of physical medicine and rehabilitation and medical director of the University of Virginia HealthSouth Rehabilitation Hospital.

"People who have fibromyalgia try everything and magnetic mattress pads are one of the most popular complementary products they try. We did this study because we hoped to provide some useful information for them," Alfano said.

Three measures of pain were used: functional status reported by study participants on a standardized fibromyalgia questionnaire used nationwide, number of tender points on the body and pain intensity ratings.

Data were compiled for 94 fibromyalgia patients randomly divided into four groups. One control group received sham pads containing magnets that had been demagnetized through heat processing.

The second control group received only their usual treatment for fibromyalgia.

Two other groups received active magnetic pads: one group used Pad A, which provided whole-body exposure to a low, uniformly static magnetic field of negative polarity. The other used Pad B, which exposed subjects to a low static magnetic field that varied spatially and in polarity. The subjects were treated and tracked for six months.

"When we compared the groups, we did not find significant statistical differences in most of the outcome measures," said Ann Gill Taylor, co-investigator for the study and professor of nursing and director and principal investigator of the Center for Study of Complementary and Alternative Therapies at the University of Virginia.

"However, we did find a statistically significant difference in pain intensity reduction for one of the active magnet pad groups. The two groups that slept on pads with active magnets generally showed the greatest improvements in outcome scores of pain intensity level, number of tender points on the body and functional status after six months."

Pad A group exhibited a consistent improvement across all four outcome measures at three and six months. Pad B group showed an improvement in all outcomes at three months, and these improved scores were maintained at six months.

The sham pad group and the group receiving only usual care did not exhibit the same improvements.

The magnetic fields of the mattresses were tested thoroughly to quantify how much exposure, or dosage, study participants were receiving, the researchers said.

"Finding any positive results in the groups using the magnets was surprising, given how little we know about how magnets work to reduce pain," Alfano said. "The results tell us maybe this therapy works, and that maybe more research is justified. You can't draw final conclusions from only one study."

"To our knowledge, no other studies on magnet therapy have been done in as rigorous a clinical setting as the University of Virginia, and this study was the largest conducted so far," Taylor said.

"Nevertheless, larger studies are needed to find clear answers about magnets' safety and efficacy in treating pain," he concluded.

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