Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)
Magnet therapy, magnetic therapy, magnetotherapy or magnotherapy is a complementary and alternative medicine practice involving the use of static magnetic fields. Practitioners claim that subjecting certain parts of the body to magnetostatic fields produced by permanent, typically NdFeB magnets has beneficial health effects. Magnetotherapy is considered pseudoscientific by its critics.
The magnetic therapy industry totals sales of $300 million dollars per year in the United States  and sells, often with explicit health claims, products such as magnetic bracelets and jewelry; magnetic straps for wrists, ankles, and the back; shoe insoles, mattresses, and magnetic blankets (blankets with magnets woven into the material); and even water that has been "magnetized".
Legal regulations Edit
Marketing of the therapy as an effective treatment is heavily restricted by law in many jurisdictions. In the United States, for example, FDA regulations prohibit marketing a magnet therapy product that claims to treat any "significant" condition such as cancer, HIV, AIDS, asthma, arthritis, or rheumatism.
Recent studies conducted by Dr. Thomas Skalak of the University of Virginia's Department of Biomedical Engineering has shown that moderate strength magnetic fields can reduce inflammation from injury in rats.
A randomized controlled trial has found a statistically significant effect using non-magnetic and weak magnetic bracelets as controls against strong magnets. However, blinding was not perfect, as patients can assess the magnetic strength of the bracelets.
In certain cases, there is limited scientific theory under which the claimed benefits of magnet therapy might act. A 2002 National Science Foundation (NSF) report on public attitudes and understanding of science noted that magnet therapy is "not at all scientific." A randomized, double-blind, placebo controlled trial of 101 adults diagnosed with plantar heel pain carried out in year 2003 found no significant difference in outcome between use of active vs sham magnets.
A number of vendors make unsupported claims about magnet therapy by using pseudoscientific and new-age language. Such claims are criticized by skeptics. Most criticisms include:
- The typical magnet used produces insufficient magnetic field to have any effect on muscle tissue, bones, blood vessels, or organs.
- Some manufacturers claim that the magnets help to circulate the blood by interacting with the iron in hemoglobin, a major component of red blood cells. However in its ionised form, iron is not ferromagnetic and would not be subject to magnetic attraction, save for magnetohydrodynamic forces due to its charge.
- Others claim that the magnets can restore the body's theorized "electromagnetic energy balance", but no such balance is medically recognized.
- There are claims that the south pole of a magnet acts differently on the body than the north pole.
- Many of the websites that provide information and resources promoting the benefits of magnetic therapy belong to individuals and companies that profit from the sale of magnetic therapy products.
See also Edit
- ↑ Leonard Finegold (2006). Magnet Therapy. British Medical Journal 332 (4).
- ↑ Magnets. CDRH Consumer Information. Food and Drug Administration. URL accessed on 2007-02-02.
- ↑ Study. Acute Exposure to a Moderate Strength Magnetic Field Reduces Edema Formation in Rats. American Journal of Physiology. URL accessed on 2008-02-29.
- ↑ Carter R, Aspy CB, Mold J. The effectiveness of magnet therapy for treatment of wrist pain attributed to carpal tunnel syndrome. J Fam Pract 2002;51: 38-40.
- ↑ Collacott EA, Zimmerman JT, White DW, Rindone JP. Bipolar permanent magnets for the treatment of chronic low back pain: a pilot study. JAMA 2000;283: 1322-5.
- ↑ Finegold, L. Flamm, B. (2006). Magnet therapy. British Medical Journal 332: 4.
- ↑ http://www.bmj.com/cgi/content/abstract/329/7480/1450
- ↑ Stick, C., K. Hinkelmann, P, Eggert, H, Wendhausen (1991). Do strong static magnetic fields in NMR tomography modify tissue perfusion?. Nuklearmedizin 154: 326.
- ↑ Polk, Charles; Elliot Postow (1996). Handbook of Biological Effects of Electromagnetic Fields, 161, CRC Press.
- ↑ National Science Board (2002). Science and Engineering Indicators – 2002, ch. 7, Arlington, VA: National Science Foundation. "Among all who had heard of [magnet therapy], 14 percent said it was very scientific and another 54 percent said it was sort of scientific. Only 25 percent of those surveyed answered correctly, that is, that it is not at all scientific."
- ↑ [http://jama.ama-assn.org/cgi/content/abstract/290/11/1474 Effect of Magnetic vs Sham-Magnetic Insoles on Plantar Heel Pain], Mark H. Winemiller, MD; Robert G. Billow, DO; Edward R. Laskowski, MD; W. Scott Harmsen, MS; Journal of the American Medical Association
- ↑ Magnetic Therapy: Plausible Attraction? by James D. Livingston — a Skeptical Inquirer article
- ↑ Park, Robert L. (2000). Voodoo Science: The Road from Foolishness to Fraud, 58-63, New York, New York: Oxford University Press.
- ↑ http://www.radiologyinfo.org/content/safety/mri_safety.htm
- ↑ 
- Bi-Axial Rotating Magnetic Field Therapy in Refractory Neuropathic Foot Pain Secondary to Diabetic Peripheral Neuropathy http://clinicaltrials.gov/ct/show/NCT00123136;jsessionid=0936D03FAC90B073465A14BB54DC005A?order=12
- Magnetic Therapy: Can magnets alleviate pain? by Cecil Adams
- Magnetic Therapy: Plausible Attraction? by James D. Livingston — a Skeptical Inquirer article
- Magnet therapy in the Skeptic's Dictionary by Robert Todd Carroll, Ph.D.
- Magnet therapy — an editorial in the British Medical Journal
- Magnet Therapy: A Skeptical View — article by Stephen Barrett, M.D.