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Related Experiment Videos

Posture and the nasal cycle.

P Cole, J S Haight

    The Annals of Otology, Rhinology, and Laryngology
    |May 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    The nasal cycle of airflow resistance persists in healthy adults across various positions and activities. Nasal obstruction significantly increases resistance, impacting breathing assessments.

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    Area of Science:

    • Physiology
    • Respiratory Medicine

    Background:

    • The nasal cycle, an alternating change in nasal airflow resistance between nostrils, is a known physiological phenomenon.
    • Its persistence and characteristics in different body positions and during daily activities require further investigation.

    Purpose of the Study:

    • To investigate the persistence of the spontaneous nasal cycle of airflow resistance in healthy young adults.
    • To determine the influence of posture, activity, and nasal obstruction on the nasal cycle.

    Main Methods:

    • Nasal airflow resistance was measured in healthy young adults in various postures (standing, supine, lateral recumbent) and during 24-hour periods of activity and rest.
    • Subjects included those with normal nasal passages and those with fixed unilateral obstruction.

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    Main Results:

    • The nasal cycle persisted across all tested postures and throughout 24-hour periods.
    • Recumbency augmented the cycle's amplitude, but overall nasal resistance showed minimal change with posture or activity.
    • Subjects with normal noses maintained resistance between 2-3 cm H2O/L/s, while those with unilateral obstruction exhibited high cyclical resistances.

    Conclusions:

    • The nasal cycle is a robust physiological phenomenon present in healthy adults regardless of posture or activity level.
    • Nasal obstruction significantly impacts nasal airflow resistance, highlighting the cycle's relevance in clinical assessments.
    • Understanding the nasal cycle is crucial for rhinoscopic evaluation, managing nasal airway obstruction, and diagnosing sleep-related breathing disorders.