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Related Experiment Videos

Frequency limitation in the human baroreceptor reflex.

C Borst, J M Karemaker, A J Dunning

    Journal of the Autonomic Nervous System
    |November 1, 1983
    PubMed
    Summary

    Electrical stimulation of carotid sinus nerves shows therapeutic potential. Higher frequencies (80-120 Hz) initially lower blood pressure most effectively, but adaptation occurs at higher rates (200 Hz).

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    Area of Science:

    • Neuroscience
    • Cardiovascular Physiology

    Background:

    • Baroreceptor reflex is crucial for blood pressure regulation.
    • Electrical stimulation of carotid sinus nerves is explored for therapeutic applications.

    Purpose of the Study:

    • To investigate the effects of varying frequencies of carotid sinus nerve stimulation on blood pressure and heart rate.
    • To determine the optimal stimulation frequency for eliciting depressor responses.
    • To identify frequency-dependent adaptation in the baroreceptor reflex.

    Main Methods:

    • Low-level bilateral electrical stimulation of carotid sinus nerves in 10 unsedated subjects.
    • Stimulation frequencies ranged from 20-200 Hz.
    • Arterial pressure and RR-interval changes were monitored during stimulation.

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    Main Results:

    • Stimulation up to 80 Hz increased reflex effects.
    • Peak blood pressure reduction (21.0%) occurred at 80-120 Hz.
    • At 200 Hz, blood pressure fall reduced due to adaptation (13.6%), with peak effects occurring earlier.
    • RR-interval prolongation showed no adaptation.

    Conclusions:

    • Baroreceptor reflex frequency limitation begins around 80 Hz.
    • Stimulation above 120 Hz leads to frequency-dependent adaptation of reflex effects.
    • Findings are specific to the myelinated afferent fiber component of the reflex.