Skip to main content
construction release_alert
Scholars@Duke will be undergoing maintenance April 11-15. Some features may be unavailable during this time.
cancel

High-voltage stimulation over the human spinal cord: sources of latency variation.

Publication ,  Journal Article
Plassman, BL; Gandevia, SC
Published in: J Neurol Neurosurg Psychiatry
February 1989

Percutaneous electrical stimuli (up to 600 V) were applied over the cervical spinal cord to evoke responses in the biceps brachii and thenar muscles. Cathodal stimulation over the C7 spinous process was more effective than anodal stimulation or stimulation over the C5 or C3 spinous process. As the stimulus intensity was increased, the response amplitude increased and the latency decreased. When progressively higher levels of supramaximal stimuli were delivered the latency often decreased further. The shortest latencies evoked by stimulation over the C7 spinous process were close to the latencies of the responses evoked by supramaximal stimulation near Erb's point. Thus, with this type of stimulation, the site of nerve activation changes with different stimulus intensities. The variability in latency introduced by distal spread of the site of activation will affect measurements of central motor conduction time and should be considered in the diagnostic use of this technique.

Duke Scholars

Published In

J Neurol Neurosurg Psychiatry

DOI

ISSN

0022-3050

Publication Date

February 1989

Volume

52

Issue

2

Start / End Page

213 / 217

Location

England

Related Subject Headings

  • Synaptic Transmission
  • Spinal Cord
  • Reaction Time
  • Peripheral Nerves
  • Neurology & Neurosurgery
  • Muscles
  • Motor Cortex
  • Humans
  • Electromyography
  • Electric Stimulation
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Plassman, B. L., & Gandevia, S. C. (1989). High-voltage stimulation over the human spinal cord: sources of latency variation. J Neurol Neurosurg Psychiatry, 52(2), 213–217. https://doi.org/10.1136/jnnp.52.2.213
Plassman, B. L., and S. C. Gandevia. “High-voltage stimulation over the human spinal cord: sources of latency variation.J Neurol Neurosurg Psychiatry 52, no. 2 (February 1989): 213–17. https://doi.org/10.1136/jnnp.52.2.213.
Plassman BL, Gandevia SC. High-voltage stimulation over the human spinal cord: sources of latency variation. J Neurol Neurosurg Psychiatry. 1989 Feb;52(2):213–7.
Plassman, B. L., and S. C. Gandevia. “High-voltage stimulation over the human spinal cord: sources of latency variation.J Neurol Neurosurg Psychiatry, vol. 52, no. 2, Feb. 1989, pp. 213–17. Pubmed, doi:10.1136/jnnp.52.2.213.
Plassman BL, Gandevia SC. High-voltage stimulation over the human spinal cord: sources of latency variation. J Neurol Neurosurg Psychiatry. 1989 Feb;52(2):213–217.

Published In

J Neurol Neurosurg Psychiatry

DOI

ISSN

0022-3050

Publication Date

February 1989

Volume

52

Issue

2

Start / End Page

213 / 217

Location

England

Related Subject Headings

  • Synaptic Transmission
  • Spinal Cord
  • Reaction Time
  • Peripheral Nerves
  • Neurology & Neurosurgery
  • Muscles
  • Motor Cortex
  • Humans
  • Electromyography
  • Electric Stimulation