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Cardiorespiratory interactions during resistive load breathing.

P Calabrese1, H Perrault, T P Dinh

  • 1Laboratoire de Physiologie Respiratoire Expérimentale, Théorique et Appliquée, Université Joseph Fourier, 38700 La Tronche, France.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|November 18, 2000
PubMed
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Adding resistive loads to breathing alters cardiorespiratory interactions. Increased breathing cycle duration significantly impacts heart rate variability (HRV) and respiratory sinus arrhythmia (RSA) characteristics.

Area of Science:

  • Cardiorespiratory Physiology
  • Respiratory Mechanics
  • Autonomic Nervous System Function

Background:

  • Resistive loads applied to the respiratory system induce changes in breathing patterns and intrathoracic pressure.
  • Understanding cardiorespiratory interactions is crucial for assessing physiological responses to respiratory challenges.

Purpose of the Study:

  • To investigate the impact of resistive load breathing on cardiorespiratory interactions.
  • To quantify changes in heart rate variability (HRV) and respiratory sinus arrhythmia (RSA) in response to altered breathing patterns.

Main Methods:

  • Seven healthy subjects were exposed to four different resistive loads in a randomized order.
  • Heart rate variability (HRV) spectral power components were analyzed from R-R interval sequences.

Related Experiment Videos

  • Respiratory sinus arrhythmia (RSA) amplitude and phase were calculated using instantaneous heart rate fitting.

    • Main Results:

    • Resistive loading led to a longer respiratory period and unchanged heart rate.
    • Significant increases in heart rate variability (HRV) and alterations in respiratory sinus arrhythmia (RSA) characteristics were observed.
    • HRV and RSA parameters showed a linear correlation with the respiratory period.

    Conclusions:

    • Breathing cycle duration is a critical factor influencing cardiorespiratory interactions.
    • Load-induced changes in respiratory period appear to be the primary driver of observed HRV and RSA modifications.
    • These cardiorespiratory interactions may be modulated by the time-dependent activation and dissipation of neurotransmitters involved in RSA.