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Related Concept Videos

Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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Physiological Control of Respiration

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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Related Experiment Video

Updated: May 13, 2026

Custom Smartphone Application to Guide Locomotor-Respiratory Coupling in the Field Using Step-Adaptive Breathing Sounds
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Quantifying interactions between real oscillators with information theory and phase models: application to

Yenan Zhu1, Yee-Hsee Hsieh, Rishi R Dhingra

  • 1Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 19, 2013
PubMed
Summary

This study introduces a new three-step protocol to accurately detect directional coupling between oscillators, overcoming limitations of existing methods. The protocol reliably identifies cardiorespiratory coupling in rats, revealing stronger respiratory influence on heartbeat.

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Last Updated: May 13, 2026

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Area of Science:

  • Nonlinear dynamics
  • Time series analysis
  • Computational neuroscience

Background:

  • Standard time series analysis methods lack sensitivity to the directionality of coupled oscillator interactions.
  • Existing phase-fitting methods can yield spurious results due to a lack of validation steps.

Purpose of the Study:

  • To develop and validate a robust three-step protocol for detecting and quantifying directional coupling between oscillators.
  • To investigate cardiorespiratory coupling in anesthetized rats using the proposed protocol.

Main Methods:

  • A three-step protocol involving mutual information, interaction function computation, and model validation.
  • Application to a model of coupled Stuart-Landau oscillators.
  • Investigation of cardiorespiratory coupling in anesthetized rats.

Main Results:

  • The protocol reliably detects genuine coupling in simulated data.
  • Reciprocal cardiorespiratory coupling was observed in rats.
  • Respiration exerts a stronger influence on heartbeat than vice versa, mediated by the vagus nerve.

Conclusions:

  • The proposed three-step protocol effectively identifies directional coupling between oscillators.
  • Cardiorespiratory coupling is reciprocal, with a dominant influence of respiration on heartbeat.
  • The vagus nerve plays a role in mediating bidirectional cardiorespiratory coupling.