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Related Experiment Videos

Phase relationship between normal human respiration and baroreflex responsiveness

D L Eckberg, Y T Kifle, V L Roberts

    The Journal of Physiology
    |July 1, 1980
    PubMed
    Summary

    Human baroreflex responsiveness varies with breathing phase and rate. Maximum sinus node inhibition occurs during late inspiration and early expiration, with this effect diminishing at rapid breathing rates.

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    Area of Science:

    • Cardiovascular Physiology
    • Respiratory Physiology
    • Neuroscience

    Background:

    • Arterial baroreceptors regulate blood pressure via the baroreflex.
    • Respiration influences autonomic cardiovascular control.
    • Sinus node responses are critical for heart rate regulation.

    Purpose of the Study:

    • To investigate how respiration phase and breathing frequency affect human sinus node responses to baroreceptor stimulation.
    • To understand the interplay between respiratory rhythms and baroreflex sensitivity.

    Main Methods:

    • Carotid baroreceptors were stimulated using neck suction (30 mmHg, 0.6 sec).
    • Stimulation occurred during different respiratory phases (inspiration/expiration) at various breathing frequencies (3-24 breaths/min).
    • Sinus node inhibition was measured as an indicator of baroreflex response.

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    Main Results:

    • Baroreceptor stimuli during late inspiration and early expiration caused maximal sinus node inhibition.
    • Expiratory baroreflex responses were stronger than inspiratory responses at lower breathing rates (3-12 breaths/min).
    • At rapid breathing (24 breaths/min), this respiratory-related difference in baroreflex responsiveness was lost.

    Conclusions:

    • Human baroreflex responsiveness exhibits a continuous oscillation tied to the respiratory cycle.
    • The observed phase shift suggests complex central neural interactions beyond simple gating with inspiratory activity.
    • Rapid breathing normalizes heart rate by reducing differential inspiratory-expiratory baroreflex responsiveness.