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The bioelectrical source in computing single muscle fiber action potentials

B K van Veen1, H Wolters, W Wallinga

  • 1University of Twente, Department of Electrical Engineering, Enschede, The Netherlands.

Biophysical Journal
|May 1, 1993
PubMed
Summary
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Modeling single muscle fiber action potentials (SFAPs) requires accurate bioelectrical sources. This study found that using measured transmembrane current, rather than intracellular action potential, best matches experimental SFAPs, though discrepancies remain.

Area of Science:

  • Biophysics
  • Electrophysiology
  • Computational Biology

Background:

  • Single muscle fiber action potentials (SFAPs) are typically modeled via convolution of transmembrane current with a transfer function.
  • Intracellular action potential (IAP) is often used as a practical substitute for transmembrane current in SFAP modeling.
  • Previous studies noted discrepancies between experimental and simulated SFAPs, possibly due to source description inaccuracies.

Purpose of the Study:

  • To investigate the impact of different bioelectrical source descriptions on the accuracy of simulated SFAPs.
  • To compare SFAP simulation results using analytical IAP, experimental IAP, experimental SFAP, and measured transmembrane current.

Main Methods:

  • Simulated SFAPs using a core conductor model.

Related Experiment Videos

  • Employed various source terms: analytical IAP, experimental IAP, experimental SFAP, and scaled measured transmembrane current.
  • Compared simulation outputs against experimental data.

    • Main Results:

    • Simulations using experimental IAP yielded results comparable to those with analytical IAP.
    • The best agreement between experimental and simulated SFAPs was achieved when using measured transmembrane current as the source.
    • Despite improvements, notable differences persisted between experimental and simulated SFAPs even with the optimal source.

    Conclusions:

    • The choice of bioelectrical source significantly influences SFAP simulation accuracy.
    • Measured transmembrane current provides a more accurate source for SFAP modeling than intracellular action potentials.
    • Further refinement of source descriptions or modeling approaches is necessary to fully resolve discrepancies in SFAP simulations.