Magnet therapy | Wikipedia audio article

Magnet therapy | Wikipedia audio article


Magnet therapy, magnetic therapy is a pseudoscientific
alternative medicine practice involving a weak static magnetic fields produced by a
permanent magnet. It is similar to the alternative medicine
practice of electromagnetic therapy, which uses a magnetic field generated by an electrically
powered device.Practitioners claim that subjecting certain parts of the body to weak electric
or magnetic fields has beneficial health effects. These physical and biological claims are unproven
and no effects on health or healing have been established. Although hemoglobin, the blood protein that
carries oxygen, is weakly diamagnetic (when oxygenated) or paramagnetic (when deoxygenated),
the magnets used in magnetic therapy are many orders of magnitude too weak to have any measurable
effect on blood flow. This is not to be confused with trans-cranial
magnetic stimulation, a scientifically valid form of therapy==
Methods of application==Magnet therapy involves applying the weak
magnetic field of permanent magnets to the body, for purported health benefits. Different effects are assigned to different
orientations of the magnet.Products include magnetic bracelets and jewelry; magnetic straps
for wrists, ankles, knees, and back; shoe insoles; mattresses; magnetic blankets (blankets
with magnets woven into the material); magnetic creams; magnetic supplements; plasters/patches
and water that has been “magnetized”. Application is usually performed by the patient.It
is similar to the alternative medicine practice of electromagnetic therapy, which uses the
weak electric or magnetic fields as well, but generated by electrically powered devices.==Suggested mechanisms of action==
Perhaps the most common suggested mechanism is that magnets might improve blood flow in
underlying tissues. The field surrounding magnet therapy devices
is far too weak and falls off with distance far too quickly to appreciably affect hemoglobin,
other blood components, muscle tissue, bones, blood vessels, or organs. A 1991 study on humans of static field strengths
up to 1 T found no effect on local blood flow. Tissue oxygenation is similarly unaffected. Some practitioners claim that the magnets
can restore the body’s hypothetical “electromagnetic energy balance”, but no such balance is medically
recognized. Even in the magnetic fields used in magnetic
resonance imaging, which are many times stronger, none of the claimed effects are observed. If the body were meaningfully affected by
the weak magnets used in magnet therapy, MRI would be impractical.==Efficacy==
Several studies have been conducted in recent years to investigate what role, if any, static
magnetic fields may play in health and healing. Unbiased studies of magnetic therapy are problematic,
since magnetisation can be easily detected, for instance, by the attraction forces on
ferrous (iron-containing) objects; because of this, effective blinding of studies (where
neither patients nor assessors know who is receiving treatment versus placebo) is difficult. Incomplete or insufficient blinding tends
to exaggerate treatment effects, particularly where any such effects are small. Health claims regarding longevity and cancer
treatment are implausible and unsupported by any research. More mundane health claims, most commonly
about anecdotal pain relief, also lack any credible proposed mechanism and clinical research
is not promising.The American Cancer Society states that “available scientific evidence
does not support these claims”. According to the National Center for Complementary
and Integrative Health, studies of magnetic jewelry haven’t shown demonstrable effects
on pain, nerve function, cell growth or blood flow.A 2008 systematic review of magnet therapy
for all indications found insufficient evidence to determine whether magnet therapy is effective
for pain relief, as did a 2012 review focused on osteoarthritis. Both reviews reported that small sample sizes,
inadequate randomization, and difficulty with allocation concealment all tend to bias studies
positively and limit the strength of any conclusions.==Safety==
These devices are generally considered safe in themselves, though there can be significant
financial and opportunity costs to magnet therapy, especially when treatment or diagnosis
are avoided or delayed.==Reception==
The worldwide magnet therapy industry totals sales of over a billion dollars per year,
including $300 million per year in the United States alone.A 2002 U.S. National Science
Foundation report on public attitudes and understanding of science noted that magnet
therapy is “not at all scientific.” A number of vendors make unsupported claims
about magnet therapy by using pseudoscientific and new-age language. Such claims are unsupported by the results
of scientific and clinical studies.===Legal regulations===
Marketing of any therapy as effective treatment for any condition is heavily restricted by
law in many jurisdictions unless all such claims are scientifically validated. In the United States, for example, U.S. Food
and Drug Administration regulations prohibit marketing any magnet therapy product using
medical claims, as such claims are unfounded.==See also

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