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Action potential threshold variability for different electrostimulation models and its potential impact on

Florian Soyka1, Thomas Tarnaud2,3, Carsten Alteköster1

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Summary

Different electrostimulation models significantly impact occupational exposure limits (ELVs) for electric fields. Using detailed models like MRG can lower ELVs, while SENN model variations can increase them, highlighting the need for model consideration in future guidelines.

Keywords:
axon modelingelectromagnetic exposureintermediate frequenciesmembrane channel dynamicssafety guidelines and standards

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Area of Science:

  • Biophysics
  • Computational Neuroscience
  • Occupational Health

Background:

  • Occupational exposure limit values (ELVs) for internal electric fields are crucial for worker safety.
  • These ELVs are typically derived from thresholds for action potential generation.
  • Electrostimulation models are used to calculate these thresholds, with the Spatially Extended Nonlinear Node (SENN) model being common.

Purpose of the Study:

  • To compare action potential generation thresholds across different membrane channel dynamics and electrostimulation models.
  • To evaluate the impact of these variations on derived occupational exposure limit values (ELVs).
  • To assess the influence of temperature and frequency on calculated thresholds.

Main Methods:

  • Compared action potential thresholds using the SENN model with five distinct membrane channel dynamics.
  • Utilized two detailed double-cable models (MRG-Sensory and MRG-Motor) for comparison.
  • Calculated thresholds across frequencies from 1 Hz to 100 kHz and temperatures of 22°C and 37°C.

Main Results:

  • MRG model thresholds were consistently lower than those calculated with the SENN model.
  • Alternative ELVs derived from thresholds varied significantly (up to a factor of 22) based on ion channel dynamics.
  • The double-cable MRG models suggested approximately tenfold lower alternative ELVs compared to SENN.

Conclusions:

  • The choice of electrostimulation model and membrane channel dynamics critically influences derived ELVs.
  • Future occupational exposure guidelines must account for the variability introduced by different electrostimulation models.
  • Detailed models like MRG may offer more conservative exposure limits than simpler models like SENN.