A time varying electromagnetic field causes a current to flow in a
conductor (e.g. the blood) this produces heat. This is the reason that an
MRI takes so long. By scanning the magentic field faster the temp of the
blood would rise. The FDA frowns on cooking patients while taking an MRI.
A resulting increase in blood flow and heat will have the desired
therapeutic effect.
On the other hand static magnetic field does not produce the same
phenomenon. Hence their effect is not quite as clear. There may be some
value in the alignment of electron spin and magnetic fields, but I have not
heard any valid physical explanations as to why static magnetic fields have
a therapeutic effect.
Truman
Truman Prevatt
Sarasota, FL