Influence of the magnetic fields on frog sciatic nerve

Edelman, A.; Teulon, Jacques; Puchalska, I.B.

doi:10.1016/0006-291x(79)90591-6

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…Previous reports of significant magnetic field effects on the amplitude and conduction velocity of frog sciatic nerves have been presented by Reno (1969) and Edelman et al (1979). Reno observed that when the sciatic nerve axis was oriented parallel to a 1.16-T field, the impulse conduction velocity exhibited a measurable change after 5 min of exposure, and rose 30% above the control value by 10 min.…”

Section: Discussionmentioning

confidence: 90%

“…Schwartz (1978) later reported that the conduction velocity of isolated lobster circumesophageal nerve was unaffected by a 1.2-T field applied in either a parallel or perpendicular orientation. Edelman et al (1979) observed no effect of parallel magnetic fields on the amplitude of frog sciatic nerve action potentials. However, when the nerve was placed in a perpendicular configuration in fields ranging from 0.2-0.6 T, a time-dependent increase in action potential amplitude was observed.…”

Section: Introductionmentioning

confidence: 80%

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Bioelectric properties of frog sciatic nerves during exposure to stationary magnetic fields

Gaffey

Tenforde

1983

Radiat Environ Biophys

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The bioelectric properties of frog sciatic nerves have been measured during exposure to homogeneous, stationary magnetic fields. The action potential amplitude, conduction velocity, absolute refractory period and relative refractory period were found to be unaffected by a continuous 4-h exposure to perpendicular or parallel 2.0 T (1 T equal 10(4) G) magnetic fields. These parameters also remained unchanged during a 1-h post-exposure period. The conduction velocity was similarly found to be unchanged when the field was applied continuously for 17 h. Exposure of sciatic nerves to a 1.0-T field led to no alteration in the threshold for neural excitation. The absence of magnetic field effects on nerve electrical activity observed in the present experiments contrasts with the positive findings reported previously by other investigators. These discrepancies may be attributable to an inadequate control of ambient temperature in the earlier studies.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 80%

Bioelectric properties of frog sciatic nerves during exposure to stationary magnetic fields

Gaffey

Tenforde

1983

Radiat Environ Biophys

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“…However, the results reported by Edelman et al,38 like those of Reno,37 are fully consistent with thermal effects associated with the dissipation of heat from electromagnet coils under conditions where no provision is made for rigorous temperature regulation within the magnet gap. It should also be noted that Edelman et al 38 used electrical stimuli that produced submaximal action potentials with amplitudes of 7-10 mV. As discussed above, Gaffey and Tenforde 34 have demonstrated that such submaximal action potentials are extremely temperature sensitive.…”

Section: Nervous Systemmentioning

confidence: 97%

“…37,38 In studies with intact frog sciatic nerves, Ren0 37 found that the application of a homogeneous 1.16-T field oriented parallel to the nerve axis led to a measurable increase in the impulse conduction velocity beginning after approximately 5 min of exposure. After 20 min in the field, the nerve, conduction velocity r~ached a level that was 30% above the pre-exposure control value.…”

Section: Nervous Systemmentioning

confidence: 99%

“…In another ser1es of experiments that produced positive effects, Edelman et al 38 reported that the application of 0.10-0.71 T stationary magnetic fields perpendicular to the frog sciatic nerve axia produced a gradual increase in the amplitude of evoked action potentials. This effect appeared 15-20 min after the field was applied, and the action potential amplitude reached levels as high as 80% above the pre-exposure control level after 1 h of exposure.…”

Section: Nervous Systemmentioning

confidence: 99%

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Biological Effects of Stationary Magnetic Fields

Tenforde

1985

Biological Effects and Dosimetry of Static and ELF Electromagnetic Fields

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Absence of relation between sick leave caused by musculoskeletal disorders and exposure to magnetic fields in an aluminum plant

Moen

Drabløs

Pedersen

et al. 1996

Bioelectromagnetics

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This is a study of the relationship between occupational exposure to magnetic fields in pot rooms and occurrence of sick leave caused by musculoskeletal disorders. The average exposure to static magnetic fields was 8 mT in the pot rooms. Ripple fields were recorded as well. A cohort of 342 exposed workers and 222 unexposed workers from the same electrolysis plant was retrospectively followed for 5 years. The reference group had a type of work similar to the exposed group except for the exposure to magnetic fields. The occurrence of sick leave and the diagnoses causing the sick leave were obtained from the Occupational Health Care Unit: these data were stored in their computer files. The data were complete. No relationship between the occurrence of sick leave caused by musculoskeletal disorders and exposure to magnetic fields was found. This was the case for both the annual number of periods of sick leave and the total number of days with sick leave. The results must be interpreted with caution due to limitations in the design and available data. Also, static magnetic fields constituted the major exposure, and the results may be different when related to work in other types of magnetic‐field exposure. © 1996 Wiley‐Liss, Inc.

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Influence of the magnetic fields on frog sciatic nerve

Cited by 17 publications

References 5 publications

Bioelectric properties of frog sciatic nerves during exposure to stationary magnetic fields

Bioelectric properties of frog sciatic nerves during exposure to stationary magnetic fields

Biological Effects of Stationary Magnetic Fields

Absence of relation between sick leave caused by musculoskeletal disorders and exposure to magnetic fields in an aluminum plant

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