Static magnets: what are they and what do they do?

Laakso, E-Liisa; F, Lutter; Young, Catherine

doi:10.1590/s1413-35552009005000013

Cited by 6 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, evidence concerning the SMF effects on nociceptive or pain sensation processes is inconsistent and contradictory in the literature, probably due to differences in species, intensities, spatial gradients, and durations of exposure. To date, it is likely that in vivo nerve conduction studies, including a review by Laakso et al [2009], have failed to establish a link between in vitro effects and the analgesic responses observed in pain studies.…”

Section: Discussionmentioning

confidence: 99%

The effects of moderate‐intensity gradient static magnetic fields on nerve conduction

Okano

Ino

Osawa

et al. 2012

Bioelectromagnetics

View full text Add to dashboard Cite

Whether exposure to static magnetic fields (SMF) for medical applications poses a therapeutic benefit or a health hazard is at the focus of current debate. As a peripheral nerve model for studies of the SMF effects, we have investigated whether exposure of in vitro frog sciatic nerve fibers to moderate-intensity gradient SMF up to 0.7 T modulates membrane excitation and refractory processes. We measured the changes in the amplitudes of the electrically evoked compound action potentials for three groups: a control group without SMF exposure and two exposed groups with continuous inhomogeneous exposure to maximum flux densities (B(max)) of 0.21 and 0.7 T SMF for 6 h. The values of the nerve conduction velocity of C fibers were significantly reduced by B(max) of 0.7 T SMF during the 4- to 6-h exposure period but not by B(max) of 0.21 T SMF during the entire exposure period of 6 h, relative to the unexposed control. From these findings, we speculate that exposure to moderate-intensity gradient SMF may attenuate pain perception because the C fibers are responsible for pain transmission. Although the mechanistic reasons for this decrease have yet to be clarified, SMF could affect the behavior of some types of ion channels associated with C fibers.

show abstract

Section: Discussionmentioning

confidence: 99%

The effects of moderate‐intensity gradient static magnetic fields on nerve conduction

Okano

Ino

Osawa

et al. 2012

Bioelectromagnetics

View full text Add to dashboard Cite

show abstract

“…The PEMF favors a rapid reduction of the acute inflammatory process, as well as acceleration of the chronic phase with rapid tissue recovery process and stimulation of fibroblasts due to the increased kinetic and ionic activity of the therapeutic process (13) . The magnetic field acts mainly on the circulatory system, allowing an increase in blood flow, vasodilation and neovascular formation in the applied tissue, providing an increase in the local immune system input, as well as improving tissue tropism (14) . The PEMF generates an increase in blood flow in the applied tissue, as well as concentration of inflammatory cells favoring biological changes in the application region.…”

Section: Discussionmentioning

confidence: 99%

Effect of the magnetotherapy in the regeneration after tenotomy in animals

Grimaldo¹,

Silva²,

Bezerra³

et al. 2019

Manual Therapy, Posturology &Amp; Rehabilitation Journal

View full text Add to dashboard Cite

Background:The Achilles tendon is the largest and most resistant tendon in the human body, being one of the most common areas of overload injury among athletes. The rupture occurs more frequently in football athletes, running and jumping, because these activities cause a great stress on the tendon during eccentric muscle contraction of the sural triceps. Among the different physiotherapy resources used to repair tendon injuries, there is magnetotherapy, which is a feature that uses a pulsatile electromagnetic field, a suggested inducer of the acceleration of regeneration. Objective: To investigate the effects of magnetotherapy on the organization of collagen and elastic fibers and inflammatory process induced in different days and phases of the healing process of Achilles tendon injury in rats. Method: This study is a randomized controlled trial. Thirty female Wistar rats were randomly divided into 5 groups (each with n = 6), submitted to tenotomy by transverse shear in the middle third of the right Achilles tendon, except for group 1, which was control group without injury, sacrificed on day 14. Group 2, control with injury, sacrificed on day 7; group 3 was treated and received 5 pulsed electromagnetic field (PEMF) applications from 24h post injury and sacrificed on day 7; group 4, control with injury and sacrificed on day 14; and group 5 received 12 PEMF applications from 24h post injury and sacrificed on day 14. The parameters used were 20 mT, 50Hz and 30 minutes of application in each session, using the Magnetherp  330 digital device (Meditea  ). At the end of treatment, a histological study was performed to evaluate the amount of collagen and elastic cells and fibers and to compare the degree of organization of collagen fibers. Results: G -3, compared to its control G -2 showed lower acute inflammatory response; G -5 did not show acute and chronic inflammation and possessed an accelerated process of repair without fibrosis, unlike its control. Conclusion:The magnetotherapy decreased the signs of inflammation in the acute phase, accelerated the repair process with the onset of fibrosis in 7 days; and at 14 days the tendon tissue was healed, with organizing fibrosis, without acute or chronic inflammation.

show abstract

“…Physiological effects of magnetic therapy include: increased permeability of plasmatic membranes, increased enzyme and cytochrome activity, improved blood circulation, increased immunity defenses, effects on metabolism, effects on cellular reproduction, effects on the regeneration of tissue, and stimulation of osteogenesis. In addition to pain relief, reduction in swelling, induction of more restful sleep, stress relief and anti-infective properties are observed 1,2) . Altering radical dependent biochemical processes, or lipid membranes, and exerting forces on cell intermediates or charged particles such as electrolytes are mechanisms that may alter the firing rate of neurons, change the rate of enzyme-mediated reactions, affect calcium channels, or increase local blood circulation 3,4) .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of the Magnetic Field Therapy on Motor Unit Action Potentials and Balance of Healthy Subjects

Muammer

Hayran

2013

J Phys Ther Sci

View full text Add to dashboard Cite

Abstract.[Purpose] The aim of this study was to investigate the effect of the magnetic field therapy on the motor unit action potentials from the muscles of the sole of the foot and balance of healthy subjects.[Subjects] Twentyfour volunteer students from Yeditepe University Department of Physical Therapy and Rehabilitation participated in this study.[Method] The feet region received 60-Gauss intensity pulsed magnetic field therapy for 20 minutes using a 30-cm solenoid electrode. Motor unit action potentials of the muscles of the sole were evaluated in both the dominant and non-dominant legs before and after the application of magnetic field therapy. One leg standing balance tests under the eyes open and eyes closed conditions in the static and dynamic forms were also evaluated in both the dominant and non-dominant legs before and after the application of magnetic field therapy. [Results] Motor unit action potential values and balance tests results showed statistically significant improvements in the post-treatment period in comparison to the pre-treatment observations. A strongly significant positive correlation was found between the motor unit action potentials and eyes open static balance on the non-dominant side. [Conclusions] Magnetic field therapy improves the activities of muscles and balance of healthy subjects.

show abstract

Static magnets: what are they and what do they do?

Abstract: Introduction: Therapeutic static magnets have gained wide community acceptance for neuromusculoskeletal pain relief in many

Cited by 6 publications

References 31 publications

The effects of moderate‐intensity gradient static magnetic fields on nerve conduction

The effects of moderate‐intensity gradient static magnetic fields on nerve conduction

Effect of the magnetotherapy in the regeneration after tenotomy in animals

Evaluation of the Effect of the Magnetic Field Therapy on Motor Unit Action Potentials and Balance of Healthy Subjects

Contact Info

Product

Resources

About