Magnetic fields have been shown to have an effect on living tissue as early as the 1930's. Plants have been shown to have an improved growth rate when raised in a magnetic field (Mericle et al., 1964). More recently, doctors and physical therapists have used either static or fluctuating magnetic fields to aid in pain management, most comonly for broken bones. In the case study presented here, Carlos Vallbona and his colleagues sought to answer the question "Can the chronic pain experienced by postpolio patients be relieved by magnetic fields applied directly over an identified pain trigger point?"
Mericle, R. P. et al. "Plant Growth Responses". in : Biological
effects of magnetic fields. New York: Plenium Press 1964.
Vallbona, Carlos et. al., "Response of pain to static Magnetic fields in postpolio patients, a double blind Pilot study" Archives of Physical Medicine and Rehabilitation. Vol 78, American congress of rehabilitaion medicine, p 1200-1203.