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Effect of gravity on chest wall mechanics
D Bettinelli1, C Kays, O Bailliart
1Dipartimento di Medicina Sperimentale, Ambientale e Biotecnologie Mediche, Università di Milano-Bicocca, I-20052 Monza, Italy.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 18, 2002
Summary
Chest wall mechanics change significantly with altered gravity. Increased G(z) drastically reduces chest wall compliance, demonstrating a non-linear response dependent on volume and gravitational force.
Area of Science:
- Physiology
- Gravitational Biology
- Biomechanics
Background:
- Understanding chest wall mechanics is crucial for respiratory physiology.
- Altered gravity environments, such as during spaceflight or parabolic flights, significantly impact physiological systems.
- The behavior of the chest wall under varying gravitational loads is not fully elucidated.
Purpose of the Study:
- To investigate chest wall mechanics under changing craniocaudal gravity (G(z)) during parabolic flights.
- To quantify the effects of different G(z) levels on chest wall compliance and volume-pressure relationships.
Main Methods:
- Chest wall mechanics were assessed in four subjects during parabolic flights.
- Measurements included volume-pressure curves and compliance at varying G(z) levels (0 G(z), 1 G(z), 1.8 G(z)).
- Lung volumes were analyzed relative to vital capacity (VC).
Main Results:
- At 0 G(z), the thorax exhibited high compliance (recoil: -2 to 2 cmH(2)O between 30-70% VC).
- Increasing G(z) shifted the volume-pressure curve leftward and exponentially decreased compliance.
- Gravity's effect on lung volume varied with G(z) magnitude and chest wall volume, showing inspiratory and expiratory influences.
Conclusions:
- Chest wall mechanics are highly sensitive to altered gravity.
- The chest wall exhibits non-linear behavior under changing G(z), with effects dependent on both volume and G(z) magnitude.
- These findings have implications for respiratory function in microgravity and hypergravity environments.
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