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In Vitro Assessment of Cardiac Function Using Skinned Cardiomyocytes
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Uncovering cross-bridge properties that underlie the cardiac active complex modulus using model linearisation

Julia H Musgrave1, June-Chiew Han1, Marie-Louise Ward2

  • 1Auckland Bioengineering Institute, The University of Auckland, New Zealand.

Mathematical Biosciences
|October 21, 2022
PubMed
Summary

This study develops a biophysical model for cardiac cross-bridge kinetics, clarifying how different components contribute to the muscle

Keywords:
Cardiac cross-bridge modelComplex modulusCross-bridge strain dependenceCrossbridge work productionSarcomere length dependenceSinusoidal analysis

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Area of Science:

  • * Biophysics
  • * Cardiac Physiology
  • * Muscle Mechanics

Background:

  • * Cardiac cross-bridge kinetics are characterized by the muscle's active complex modulus.
  • * Existing cross-bridge models inconsistently represent the biophysical mechanisms of these components.
  • * Understanding these mechanisms is crucial for accurate cardiac function modeling.

Purpose of the Study:

  • * To analyze the contributions of common cross-bridge model properties to the active complex modulus.
  • * To develop a biophysical model of cardiac cross-bridge kinetics.
  • * To clarify the representation of the complex modulus components in cardiac muscle.

Main Methods:

  • * Model linearization techniques applied to cross-bridge models.
  • * Analysis of transfer functions for individual model components.
  • * Development of a novel biophysical model incorporating key kinetic properties.

Main Results:

  • * Identified three components of the active complex modulus: low-frequency elastic, high-frequency elastic, and negative viscous moduli.
  • * Demonstrated that sarcomere velocity's effect on cross-bridge strain often masks the negative viscous component.
  • * Showed that the relative contributions of these components are critical for accurate modulus representation.

Conclusions:

  • * A comprehensive biophysical model can theoretically reproduce the cardiac complex modulus.
  • * Current models often neglect the relative contributions of modulus components, obscuring work production mechanisms.
  • * Further refinement of cross-bridge models is needed to accurately capture cardiac muscle mechanics and energetics.