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A model of the respiratory pump.

D R Hillman¹, K E Finucane

¹Department of Pulmonary Physiology, Sir Charles Gairdner Hospital, Perth, Western Australia.

Journal of Applied Physiology (Bethesda, Md. : 1985)

|September 1, 1987

Summary

This study presents a simple lever model to predict how forces affect chest wall motion and lung volume. The model helps understand respiratory muscle interactions and quantify forces on the rib cage.

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Area of Science:

Physiology
Biomechanics

Background:

Chest wall motion and lung volume changes result from complex force interactions.
Understanding these forces is crucial for respiratory mechanics.
Current models may not fully capture the interplay of various respiratory components.

Purpose of the Study:

To develop a simple model predicting chest wall motion based on applied forces.
To aid in understanding the complex interactions of respiratory muscles and passive impedances.
To provide a framework for quantifying forces acting on the rib cage.

Main Methods:

A lever system model was developed to represent forces acting on the chest wall.
Active forces from respiratory muscles and passive forces from impedances were incorporated.
Analysis of moments was used to derive equations relating force changes to motion.

Main Results:

The model predicts the effect of force changes on chest wall motion (translational/rotational).
It allows modeling the interaction between the diaphragm, rib cage, and abdomen.
The model appears valid across various respiratory maneuvers.

Conclusions:

The developed lever model offers a simplified yet effective way to understand respiratory mechanics.
It aids in interpreting the relative motion of the rib cage and abdomen.
The model has potential utility in quantifying effective forces on the rib cage.

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