How the size of the needle electrode leading-off surface influences the shape of the single muscle fibre action potential in electromyography
✍ Scribed by Jan Ekstedt; Erik Stålberg
- Publisher
- Elsevier Science
- Year
- 1973
- Weight
- 409 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0010-468X
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✦ Synopsis
The influence of the size of the leading-off surface on the shape of the extracellular single muscle fiber action potential has been studied with a digital computer simulation program.
A 25 ta round leading-off surface has very little influence on the amplitude in comparison to what is obtained with a point-shaped electrode.
The 580 # × 150 ~ leading-off surface in a concentric needle electrode considerably decreases the amplitude of action potentials from fibers close to the leading-off surface. Action potentials from more remote fibers, however, are not very much affected. This makes concentric needle electrodes not very well suited for single fiber electromyography.
Fiber action potential
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