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Related Experiment Videos

Sleep and posture

M Tvinnereim1, P Cole, J S Haight

  • 1University Department of Respirology, St. Michael's Hospital, Toronto, Canada.

The Laryngoscope
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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Computer-assisted studies show that airway pressures and resistances in healthy men remain stable during sleep, but increase significantly in snorers, impacting ventilation.

Area of Science:

  • Respiratory Physiology
  • Sleep Medicine
  • Biomedical Engineering

Background:

  • Upper airway resistance is a key factor in breathing.
  • Understanding pharyngeal pressure dynamics is crucial for sleep-disordered breathing.
  • Previous studies suggest posture and sleep stage influence airway mechanics.

Purpose of the Study:

  • To quantify transpharyngeal pressures and airflow resistances in healthy men during sleep.
  • To investigate the impact of posture and sleep stage on airway resistance.
  • To compare airway resistance in snorers versus non-snorers.

Main Methods:

  • Computer-assisted open catheter studies were performed on 10 healthy men.
  • Measurements included transpharyngeal differential pressures and airflow resistances.

Related Experiment Videos

  • Data were collected in dorsal and lateral recumbent positions across sleep stages I and II.
  • Subjects were categorized as snorers or non-snorers.

    • Main Results:

    • Stable intrasubject transpharyngeal pressures and resistances were observed in non-snorers across postures and sleep stages.
    • Snorers exhibited significantly increased pharyngeal pressures and resistances, especially during sleep and snoring.
    • Elevated upper airway resistances led to diminished ventilation, independent of nasal resistance.
    • Transpharyngeal pressures during snoring frequently exceeded 300 Pa.

    Conclusions:

    • Sleep and snoring substantially increase upper airway resistance in susceptible individuals.
    • Increased airway resistance during sleep can impair ventilation.
    • Pressure measurements are effective in characterizing breathing patterns and events during sleep.