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Related Experiment Videos

Posture and nasal patency.

P Cole, J S Haight

    The American Review of Respiratory Disease
    |March 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Recumbency minimally affects nasal patency in healthy adults. However, lateral positions significantly decrease airflow in one nostril, with reflexes, not gravity, causing these nasal changes.

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    Area of Science:

    • Physiology
    • Respiratory System
    • Sleep Medicine

    Background:

    • Nasal patency is crucial for comfortable breathing.
    • Body posture, including recumbency, can influence nasal airflow.
    • Understanding these effects is important for sleep-disordered breathing.

    Purpose of the Study:

    • To quantify the effects of different recumbent positions on nasal patency.
    • To investigate the mechanisms behind posture-induced changes in nasal airflow.
    • To explore the relevance for individuals with abnormal nasal anatomy or sleep disorders.

    Main Methods:

    • Employed a computer-assisted posterior rhinometry technique for sensitive measurements.
    • Utilized a modified body plethysmograph to measure airflow without facial masks or nasal intubation.

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  • Assessed healthy adult subjects in various recumbent positions and with applied unilateral pressures.

    • Main Results:

    • Recumbency caused minimal decrease in total nasal patency in healthy subjects.
    • Lateral recumbency significantly reduced patency in the ipsilateral nasal cavity (increased resistance).
    • Contralateral nasal cavity showed increased patency (decreased resistance), mitigating overall change.
    • Unilateral pressures in dorsal recumbency induced similar reciprocal changes, independent of hydrostatic effects.

    Conclusions:

    • Reciprocal changes in nasal patency during lateral recumbency are mediated by pressure-induced reflexes.
    • These reflex mechanisms are independent of hydrostatic pressure differences.
    • Findings suggest implications for understanding breathing patterns during sleep, particularly in abnormal nasal conditions.