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Heart rate response to breathing: dependency upon breathing pattern.

J Mehlsen, K Pagh, J S Nielsen

    Clinical Physiology (Oxford, England)
    |April 1, 1987
    PubMed
    Summary
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    Investigating lung volume changes in healthy males revealed biphasic heart rate responses. Stepwise breathing is recommended over periodic breathing for accurately assessing vagal tone.

    Area of Science:

    • Physiology
    • Cardiovascular Research
    • Respiratory Physiology

    Background:

    • Understanding the autonomic nervous system's control of heart rate is crucial.
    • Breathing mechanics significantly influence cardiovascular function.
    • Assessing vagal tone is important for evaluating cardiac health.

    Purpose of the Study:

    • To investigate heart rate responses to stepwise and periodic changes in lung volume.
    • To determine the optimal method for assessing vagal function through respiratory maneuvers.
    • To analyze the relationship between breathing frequency and heart rate variability.

    Main Methods:

    • Seven young healthy males participated in the study.
    • Measurements included heart rate responses to stepwise and periodic lung volume changes.

    Related Experiment Videos

  • Breathing frequencies ranged from 3.0 to 12.0 respirations per minute.

    • Main Results:

    • Both inspiration and expiration induced a biphasic heart rate response (increase then decrease).
    • Inspiration led to faster and larger heart rate changes compared to expiration.
    • Heart rate response amplitude varied with breathing frequency, peaking between 5.5-7.0 r.p.m.

    Conclusions:

    • Stepwise lung volume changes elicit more pronounced and consistent heart rate variations than periodic changes.
    • The complex interplay of transient heart rate changes complicates analysis during periodic breathing.
    • Transient heart rate changes from stepwise maneuvers are recommended for simplified and reliable vagal function assessment.