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Related Experiment Videos

Fall in vital capacity with posture.

S M Allen, B Hunt, M Green

    British Journal of Diseases of the Chest
    |July 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The change in forced vital capacity (FVC) from standing to supine did not significantly differ between normal, obstructive, and restrictive lung function groups. Specific delta FVC thresholds suggest further diaphragm function studies.

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    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology

    Background:

    • Diaphragm function is crucial for respiration.
    • Assessing diaphragm function can be challenging.
    • Changes in lung volumes with posture may indicate diaphragmatic issues.

    Purpose of the Study:

    • To evaluate the change in forced vital capacity (FVC) from standing to supine (delta FVC) across different lung function groups.
    • To determine if delta FVC can serve as an indicator for further diaphragm function assessment.

    Main Methods:

    • A study involving 147 subjects was conducted.
    • Subjects were categorized into normal, obstructive, and restrictive lung function groups.
    • The reduction in FVC from standing to supine (delta FVC) was measured and compared between groups.

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    Main Results:

    • The mean delta FVC was 7.5% (normals), 11.2% (obstructive), and 8.2% (restrictive).
    • No significant differences in delta FVC were observed between the groups.
    • 95% upper confidence limits for delta FVC were 19% (normals), 38% (obstructive), and 24% (restrictive).

    Conclusions:

    • Delta FVC alone does not significantly differentiate between lung function groups.
    • A delta FVC exceeding 25% in normal/restrictive lung function or 35% in obstructive lung function warrants further diaphragm function investigation.