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Related Experiment Videos

Functional mechanism of expiratory pattern generator.

M Sibuya1, I Homma

  • 1Department of Physiology, Showa University School of Medicine, Tokyo, Japan.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1989
PubMed
Summary

Hypercapnia alters breathing patterns in rabbits by increasing expiratory activity. Vagotomy changes this response, prolonging expiratory time and suggesting a conserved expiratory off-switch mechanism similar to humans.

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Area of Science:

  • Respiratory Physiology
  • Neuroscience
  • Comparative Biology

Background:

  • Breathing regulation involves complex neural circuits controlling expiratory muscle activity.
  • Understanding the temporal dynamics of breathing, particularly during hypercapnia, is crucial for respiratory control research.

Purpose of the Study:

  • To investigate the effects of hypercapnia on tidal expiratory activity and its temporal profile in rabbits.
  • To explore the role of vagal feedback in modulating the expiratory response to hypercapnia.
  • To propose a model for the expiratory off-switch mechanism based on observed patterns.

Main Methods:

  • Measurement of external oblique muscle activity and its integrated curve in spontaneously breathing rabbits under anesthesia.
  • Induction of hypercapnia via CO2 rebreathing.

Related Experiment Videos

  • Comparison of expiratory activity patterns before and after bilateral vagotomy.

    • Main Results:

    • Hypercapnia increased tidal expiratory activity in both intact and vagotomized rabbits.
    • In intact rabbits, hypercapnia increased the rate of rise of expiratory activity and shortened expiratory time (TEa).
    • After vagotomy, the rate of rise remained unchanged, but TEa was prolonged, indicating altered expiratory timing.

    Conclusions:

    • Vagal feedback significantly influences the temporal adjustments of expiratory activity during hypercapnia.
    • The expiratory off-switch mechanism in vagotomized rabbits exhibits characteristics similar to those observed in humans.
    • A model is proposed to explain the relationship between expiratory activity amplitude and timing.