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Related Experiment Videos

Respiratory system mechanical behavior in the chicken.

G M Barnas1, S C Hempleman, P Harinath

  • 1Department of Anesthesiology, University of Maryland, Baltimore 21201.

Respiration Physiology
|May 1, 1991
PubMed
Summary
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Avian and mammalian respiratory systems share similar mechanical behaviors, including resistance and elastance, despite anatomical differences. This study found comparable pressure-flow dynamics in roosters to mammals.

Area of Science:

  • Comparative Respiratory Physiology
  • Avian and Mammalian Mechanics
  • Biomechanics of Breathing

Background:

  • Mammalian respiratory systems exhibit predictable mechanical behavior under external forcing.
  • Understanding avian respiratory mechanics is crucial for comparative physiology.
  • Previous research has not extensively compared avian and mammalian respiratory system mechanics.

Purpose of the Study:

  • To determine if the avian respiratory system shares fundamental mechanical behaviors with mammals.
  • To quantify respiratory system resistance (R) and elastance (E) in chickens across varying frequencies and tidal volumes.
  • To compare avian respiratory mechanics with established mammalian data.

Main Methods:

  • Anesthetized and paralyzed roosters were subjected to sinusoidal volume oscillations.

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  • Airway flow and pressures were measured in the trachea, air sacs, and thoracoabdominal cavity.
  • Respiratory system resistance and elastance were calculated for different compartments at frequencies (0.2-1.0 Hz) and tidal volumes (10-50 ml).

    • Main Results:

    • Chest wall elastance was consistently lower than total respiratory system elastance.
    • Both elastances increased with frequency (f) and decreased with tidal volume (VT).
    • Respiratory system resistance and elastance in chickens showed dependencies on f and VT similar to mammals.

    Conclusions:

    • Avian and mammalian respiratory systems exhibit fundamentally similar mechanical behaviors.
    • Despite anatomical differences, the pressure-flow dynamics are comparable across species.
    • The findings support a conserved fundamental mechanical principle in vertebrate respiration.