Increased cardiorespiratory synchronization evoked by a breath controller based on heartbeat detection.

Area of Science:

• Physiology
• Cardiovascular System
• Respiratory System

Background:

• The physiological mechanisms of cardiorespiratory coupling (CRC) remain unclear.
• Studying cardiopulmonary phase synchronization is challenging due to nonstationary experimental data.
• Key issues include enhancing and quantifying synchronization, and understanding cardiac function changes.

Purpose of the Study:

• To investigate voluntary cardiorespiratory synchronization (VCRS) as a method to enhance cardiopulmonary phase synchronization.
• To analyze the impact of VCRS on cardiac function parameters.
• To explore the physiological mechanisms underlying cardiorespiratory coupling.

Main Methods:

• Participants controlled their breathing based on heartbeat detection to achieve VCRS.
• Different breathing patterns (2/2 and 4/4 modes) were implemented.
• Cardiac function parameters including blood pressure, stroke volume, and cardiac output were measured.

Main Results:

• VCRS significantly increased cardiorespiratory synchronization.
• Respiratory sinus arrhythmia (RSA) varied with breathing patterns (decreased in 2/2, increased in 4/4).
• Cardiac function parameters like blood pressure and stroke volume were significantly altered by VCRS breathing patterns.

Conclusions:

• VCRS effectively enhances cardiopulmonary phase synchronization, providing a viable method for studying cardiorespiratory interactions.
• Cardiopulmonary phase synchronization and RSA reflect distinct aspects of cardiorespiratory interaction.
• VCRS influences cardiac function and offers a tool for experimental investigation of CRC mechanisms.