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Fine temporal structure of cardiorespiratory synchronization.

Sungwoo Ahn1, Jessica Solfest, Leonid L Rubchinsky

  • 1Department of Mathematical Sciences and Center for Mathematical Biosciences, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana; and.

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Cardiorespiratory rhythms synchronize briefly and frequently, a pattern influenced by age and heart disease. This dynamic suggests adaptability in how heart and breathing coordinate.

Keywords:
cardiorespiratory interactioncardioventilatory couplingphase lockingsynchronization

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Area of Science:

  • Cardiorespiratory Physiology
  • Nonlinear Dynamics
  • Biomedical Signal Processing

Background:

  • Cardiac and respiratory rhythms show phase synchronization, influenced by physiological factors.
  • Understanding the temporal dynamics of this synchrony is crucial for assessing cardiorespiratory health.
  • Previous studies often focused on average synchrony levels, overlooking fine temporal patterns.

Purpose of the Study:

  • To investigate the fine temporal structure of cardiorespiratory phase synchronization.
  • To analyze how synchrony patterns differ between healthy young, healthy elderly, and elderly subjects with coronary artery disease.
  • To elucidate the functional implications of observed synchrony dynamics.

Main Methods:

  • Novel time-series analysis applied to cardiorespiratory data.
  • Exploration of phase-locking states at each oscillation cycle.
  • Comparison of synchrony properties across different age and health groups.

Main Results:

  • Cardiorespiratory system exhibits frequent, short desynchronization episodes followed by rapid resynchronization (within 1 cycle).
  • Synchrony patterns varied with age and coronary artery disease status.
  • Healthy subjects showed more 1:4 frequency locking; CAD subjects showed more 1:2 locking, but short desynchronizations were common across all groups.

Conclusions:

  • Short desynchronization dynamics are a prevalent feature of cardiorespiratory synchrony, regardless of age or disease.
  • These dynamics suggest a flexible system where synchrony is easily established and disrupted.
  • Intermittent synchrony may facilitate cardiorespiratory coordination and adaptation to internal/external factors.