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Related Experiment Videos

A chest wall restrictor to study effects on pulmonary function and exercise. 1. Development and validation.

C C Cline1, J R Coast, D A Arnall

  • 1Human Performance Laboratories, Texas A & M University, College Station, Tex., USA.

Respiration; International Review of Thoracic Diseases
|April 15, 1999
PubMed
Summary

A new device quantifiably restricts chest wall expansion, reducing lung function like forced expiratory vital capacity (FVC) and forced expiratory volume in 1 second (FEV1.0). This validated tool simulates breathing challenges in restrictive lung diseases and occupational settings.

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Area of Science:

  • Physiology
  • Respiratory Mechanics
  • Medical Device Design

Background:

  • Chest wall restriction impedes lung expansion, impacting pulmonary function and exercise capacity.
  • Conditions like scoliosis and occupational hazards (e.g., bulletproof vests) can cause chest wall restriction.
  • Quantifiable and reproducible methods are needed to study chest wall restriction's effects.

Purpose of the Study:

  • To describe a novel constant-pressure chest wall-restrictive device.
  • To assess the device's ability to provide quantifiable and reproducible inspiratory loads.
  • To evaluate the impact of the device on pulmonary function tests.

Main Methods:

  • A constant-pressure chest wall-restrictive device was designed and utilized.
  • Ten subjects performed pulmonary function tests (FVC, FEV1.0) under four increasing restrictive loads.

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  • Repeated-measures multivariate analysis of variance was used to analyze the data.

    • Main Results:

    • Significant decreases in forced expiratory vital capacity (FVC) and forced expiratory volume in 1 second (FEV1.0) were observed with increasing loads.
    • The ratio of FEV1.0 to FVC (FEV1.0%) remained consistent across loads.
    • No significant differences were found based on time or body position (seated vs. standing).

    Conclusions:

    • The developed device effectively applies a quantifiable and reproducible inspiratory load.
    • The device successfully mimics the pulmonary function decrements seen in restrictive lung diseases and occupational scenarios.
    • This tool offers a valuable method for researching chest wall restriction's physiological impact.