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Gravitational forces on the chest wall.

S B Liu1, T A Wilson, K Schreiner

  • 1Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis 55455.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1991
PubMed
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Gravitational work of breathing was quantified by measuring body mass motion during breathing maneuvers. This research quantifies expiratory and inspiratory gravitational forces on the rib cage and abdomen.

Area of Science:

  • Physiology
  • Biomechanics

Background:

  • The work of breathing is influenced by gravitational forces acting on the chest wall.
  • Understanding these forces is crucial for respiratory mechanics.

Purpose of the Study:

  • To determine the gravitational work of breathing by measuring vertical body mass motion.
  • To quantify expiratory and inspiratory gravitational forces on the rib cage and abdomen.

Main Methods:

  • Subjects performed breathing maneuvers in seated and supine positions on a force platform.
  • Vertical force, rib cage volume (Vrc), and abdominal volume (Vab) changes were measured.
  • Gravitational potential (Ug) was calculated and modeled using a quadratic equation.

Main Results:

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  • In seated posture, rib cage force is expiratory (~8 cmH2O) and abdominal force is inspiratory (~8 cmH2O).
  • In supine posture, both rib cage and abdominal forces are expiratory (~9 cmH2O).
  • Gravitational contributions to chest wall elastances increase with volume.

    • Conclusions:

    • Gravitational forces play a significant role in the work of breathing.
    • Posture affects the direction and magnitude of gravitational forces on respiratory compartments.
    • Gravitational effects contribute to the elastic properties of the chest wall.