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Related Experiment Videos

Magnetically evoked EMGs in rats.

Atsushi Chiba1, Ken-ichi Oshio, Masahiko Inase

  • 1Department of Physiology, Kinki University School of Medicine, Osaka-Sayama, Osaka 589-8511, Japan. kchiba@med.kindai.ac.jp

Neurological Research
|February 5, 2003
PubMed
Summary

Magnetic brain and spinal cord stimulation in rats revealed distinct electromyogram (EMG) responses. Eddy currents influence evoked potentials, impacting sciatic nerve activation and requiring consideration in magnetic stimulation applications.

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Area of Science:

  • Neuroscience
  • Biophysics

Background:

  • Electromyography (EMG) is crucial for assessing neuromuscular function.
  • Magnetic stimulation offers a non-invasive method for neural pathway investigation.

Purpose of the Study:

  • To investigate the effects of magnetic stimulation on rat spinal cord and brain.
  • To analyze evoked electromyograms (EMGs) and their latencies.
  • To understand the role of eddy currents in magnetic stimulation.

Main Methods:

  • Rats underwent magnetic stimulation of the brain and spinal cord using a figure-eight coil.
  • Electromyograms (EMGs) were recorded from the gastrocnemius muscle.
  • Stimulation sites were varied from cervical to sacral levels.
  • Motor evoked potentials (MEPs) and descending waves were analyzed.

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Main Results:

  • Transcranial magnetic stimulation induced motor evoked potentials (MEPs) with 4.8 ms latency.
  • Spinal cord stimulation generated evoked EMGs with short (1.5 ms) and long (4.1 ms) latencies, attributed to eddy currents.
  • Magnetic stimulation activated the sciatic nerve, indicated by consistent H- and M-response latencies.
  • Increased magnetic stimuli affected H- and M-like responses similarly to electrical stimulation.

Conclusions:

  • Magnetic stimulation of the spinal cord generates distinct evoked potentials influenced by eddy currents.
  • The sciatic nerve is activated at its vertebral exit during spinal magnetic stimulation.
  • While focused, magnetic stimulation's effects necessitate accounting for induced eddy currents.