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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Synchronization-Dissipation in the Cardiorespiratory System.

Joshua R Border1, Alain Nogaret1, Andrew Lefevre1

  • 1Department of Physics, University of Bath, Bath, UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

Synchronization in the cardiorespiratory system, observed as respiratory sinus arrhythmia (RSA), reduces cardiac power losses. This finding suggests RSA may enhance cardiac pumping efficiency by minimizing energy dissipation in the pulmonary vasculature.

Keywords:
cardiorespiratory systemdynamical systemsrespiratory sinus arrhythmiasynchronizationviscoelastic coupling

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Area of Science:

  • Physiology
  • Biophysics
  • Cardiovascular System

Background:

  • Dissipative coupling typically induces synchronization in oscillating systems.
  • The cardiorespiratory system exhibits coupled cardiac and respiratory rhythms, interacting via the pulmonary vasculature.
  • Respiratory sinus arrhythmia (RSA) is a manifestation of this cardiorespiratory coupling.

Purpose of the Study:

  • To investigate the functional significance of cardiorespiratory coupling and synchronization.
  • To determine if synchronization in this system reduces power dissipation.
  • To explore the impact of RSA on cardiac pumping efficiency.

Main Methods:

  • Modeling electrical and viscoelastic interactions within the cardiorespiratory system.
  • Identifying conditions that lead to synchronization between cardiac and respiratory rhythms.
  • Comparing predicted gains in cardiac output with in vivo observations.

Main Results:

  • Synchronization in the cardiorespiratory system was found to reduce cardiac power losses by approximately 10% in humans and up to 55% in other species.
  • The study identified specific conditions under which synchronization occurs.
  • Predicted gains in cardiac output were consistent with in vivo data.

Conclusions:

  • Respiratory sinus arrhythmia (RSA) may improve cardiac pumping efficiency.
  • RSA achieves this by reducing dynamic stress and power dissipation in the pulmonary vasculature.
  • Synchronization is a key mechanism for optimizing energy use in the cardiorespiratory system.