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Updated: Jan 30, 2026

Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling
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Solving a century-old conundrum underlying cardiac force-length relations.

June-Chiew Han1, Toan Pham1,2, Andrew J Taberner1,3

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

American Journal of Physiology. Heart and Circulatory Physiology
|February 2, 2019
PubMed
Summary

Cardiac force-length relations depend on contraction mode, but can appear independent under specific preload and afterload conditions. This reconciles century-old conflicting findings in cardiac physiology research.

Keywords:
Frank-Starling lawend-systolic force-length relationend-systolic pressure-volume relationisometric contractionwork-loop contraction

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Mechanics

Background:

  • Otto Frank's 19th-century work proposed cardiac pressure-volume relations depend on contraction mode.
  • Subsequent studies reported conflicting results, suggesting contraction mode-independent relations across various preparations.
  • Existing explanations for these discrepancies are contradictory and unsatisfactory.

Purpose of the Study:

  • To reconcile conflicting findings on cardiac force-length relations.
  • To investigate the influence of preload and afterload on the force-length relation.
  • To identify conditions under which the force-length relation appears contraction mode-independent.

Main Methods:

  • Experiments utilized isolated ventricular trabeculae at physiological temperature and stimulus frequency.
  • The cardiac force-length relation was explored across a wide spectrum of preloads and afterloads.
  • Isometric and shortening contractions were compared under varying loading conditions.

Main Results:

  • The force-length relation from isometric contractions was located above those from shortening contractions.
  • Low preload and high afterload conditions rendered the force-length relation contraction mode-independent.
  • Specific loading conditions explain the apparent contradiction with Frank's original findings.

Conclusions:

  • The cardiac force-length relation is indeed dependent on the mode of contraction.
  • Apparent contraction mode-independence occurs under specific preload and afterload conditions.
  • Caution is advised when using end-systolic force-length relations to interpret cardiac physiology concepts like the Frank-Starling law.