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Related Experiment Videos

Breathing during sleep in normal middle-aged subjects.

J Krieger1, N Maglasiu, E Sforza

  • 1Service d'Explorations Fonctionnelles du Système Nerveux, Centre Hospitalier Universitaire, Strasbourg, France.

Sleep
|April 1, 1990
PubMed
Summary

Middle-aged adults experience a 14-19% decrease in minute ventilation during sleep, primarily due to reduced tidal volume. Obstructive sleep apnea events were noted in 17.5% of subjects, linked to higher body mass index.

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology

Background:

  • Limited data exists on sleep ventilation changes in middle-aged adults.
  • Previous studies focused on young and elderly populations.

Purpose of the Study:

  • To investigate quantitative changes in ventilatory parameters during sleep in normal middle-aged subjects.
  • To assess the occurrence of respiratory events during sleep in this demographic.

Main Methods:

  • Polysomnography with pneumotachography and oximetry were used.
  • 40 healthy middle-aged subjects (20 men, 20 women) were studied.
  • Ventilatory parameters (minute ventilation, tidal volume, respiratory rate) were measured during wakefulness and sleep stages (NREM, REM).

Main Results:

Related Experiment Videos

  • Minute ventilation decreased by 14-19% from wakefulness to sleep, mainly due to reduced tidal volume.
  • This decrease was consistent across NREM and REM sleep stages and between sexes.
  • Apnea indices >5 were observed in 17.5% of subjects (30% men, 5% women), associated with higher BMI.
  • The magnitude of ventilation decrease correlated with wakeful ventilation levels.

    • Conclusions:

    • Middle-aged adults exhibit a significant, consistent reduction in minute ventilation during sleep.
    • Obstructive sleep apnea prevalence in this group is notable, particularly in men, and linked to BMI.
    • Sleep ventilation changes are not strongly related to the occurrence of respiratory events in this population.