Hereunder is a link to a good scientific article going somewhat deeper into explanations on the differences between PEMF and static magnetic fields.
Read the article HERE new window
There are two kinds of Magnetic Therapy:
Magnet therapy using static magnets
Pulsed ElectroMagnetic Field Therapy [PEMF].
Magnets are used in both conventional and alternative medicine. Problems arise when people confuse the positive and proven results of magnetic fields used in conventional medicine with e.g. Magnetic Resonance Imaging machines.
Some people think that magnets are magnets, they all produce magnetic fields, and whether used by hospitals or therapists, their healing potential is the same.
Not all magnetic therapy is the same, because they are not!
Hospitals use powerful and expensive electromagnets while some magnetic therapists are trying to do the same job with not much more than simple static magnets.
There are two types of magnets: electromagnets and static magnets. Both produce magnetic fields. The type of magnet that people are most familiar with is the static magnet, like the one that holds notes on your fridge.
Powerful static (permanent) magnets are manufactured with a combination of neodymium, iron and boron materials (NdFeB) and are also known under the name of "rare earth" magnets. They are supposed to have "wonderful" healing effects but explanations on how these healing effects are supposed to be obtained are not substantiated with any sound scientific proof.
Electromagnets generate electric fields which cause electric currents to flow in their surroundings.
The magnetic field of permanent magnets is static and cannot be switched off. It's on all the time. And unlike electromagnets, static do not produce electric fields!
Electromagnets on the other hand make use of electricity to create an electromagnetic field. The magnetic field that electromagnets produce can be switched on and off. Switching the field on and off very quickly is known as a pulsed magnetic field.
There is absolutely nothing wrong claiming that hospitals use magnetic fields to diagnose and/or treat you in rare cases, but it is nonsense to claim you can perform the same treatment with a silly magnetic insole.
Unfortunately many magnetic therapists do not make use of PEMF. They replace the powerful pulsed electromagnetic fields with simple and cheap static magnets. They try to convince lay people that because magnetic fields are a valid part of conventional medicine, supported by scientific studies, that the use of their static magnets will give you the same health benefits.
A pity they are in fact comparing apples with oranges. Remember that electromagnets produce electric fields but ordinary static magnets do not.
Magnets and pulsed electromagnets are not interchangeable!
Static magnetic fields has no proven health effects!
Reliable therapists use electromagnets with pulsed magnetic fields that have proven health benefits!