|
Re: [magnotherapy] anybody know this one?
The Magnablock is a set of magnets with 4 opposing poles directed to the person.
Efficacy Of A Static Magnetic Device Against Knee Pain Associated With Inflammatory Arthritis
Neil Segal, Joseph Houston., Howard Fuchs, Robert Holcomb, Michael J. McLean
Vanderbilt University Medical School; Division of Rheumatology, Department of Medicine; and, Department of Neurology Vanderbilt University Medical Center
Snip
"In this study, we examined the efficacy of treatment with a static magnetic field generator as adjunctive therapy for the joint pain in patients with inflammatory arthritis. The MagnaBlocÔ (MB; U.S. patent no 5,312,321) is a non-invasive non-significant risk device, consisting of four permanent magnets arrayed with alternating polarity in a hypoallergenic plastic case. The MagnaBloc™ is approximately 3.5 centimeters in diameter, weighs approximately 30 grams and generates a magnetic field of 190 millitesla. This device reduced mechanical low back pain and knee pain significantly more than placebo. Much larger time invariant magnetic fields like those produced by magnetic resonance imaging devices have not been shown to be harmful to man or animals "
Thwere are about 20 studies from Holcomb on the device which he believes works due to the steep field gradients, and has studies which seem to confirm this.
Measurement And Analysis Of Static Magnetic Fields Which Block Action Potentials In Cultured Neurons
A.V. Cavopol, A.W. Wamil, R.R. Holcomb and M.J. McLean
Bioelectromagnetics 16:197-206, 1995.
To characterize the algebraic properties of static magnetic fields on firing of action potentials (AP) by sensory neurons in cell culture, we developed a mathematical formalism based on the algebraic expression of the magnetic field of a single circular current loop. The calculated fields fit closely the field measurements taken with a Hall effect gaussmeter. The biological effect induced by different arrays of permanent magnets depended principally on the spatial variation of the fields, quantitated by the value of the gradient of the field magnitude. Magnetic arrays of different sizes (macroarray: four center-charged neodymiurn magnets of ~14 mm diameter; microarray: four micromagnets of the same material but ~0.4 mm diameter) allowed comparison of fields with similar gradients but different intensities at the cell position. These two arrays had a common gradient value of ~1 mT/mm and blocked > 70% of AP. Alternatively, cells placed in a field strength of ~0.2mT and a gradient of ~0.02mT/mm produced by the macroarray resulted in no significant reduction of firing; a microarray field of the same strength but with a higher gradient of ~1.5mT/mm caused ~80% AP blockade. The experimental threshold gradient and the calculated threshold field intensity for blockade of action potentials by these arrays were estimated to be ~0.02 mT/mm and ~0.02 mT, respectively. In conclusion, these findings suggest that spatial variation of the magnetic field is the principal cause for AP blockade in dorsal root ganglia in vitro.
Best wishes
--
John Bain
UK TV Sound Director, magnotherapy user & distributor
http://members.aol.com/JBainSI/Magnotherapy.html
Surround Sound for Television
|
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
Offline 
Send Email