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Influence of airway pressure on genioglossus activity during sleep in normal children

Eliot S Katz1, Carole L Marcus, David P White

  • 1Division of Pediatric Pulmonology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. eskatz@partners.org

American Journal of Respiratory and Critical Care Medicine
|January 28, 2006
PubMed

Insights

Healthy children exhibit significant variability in upper airway muscle responses and arousal thresholds during sleep. These individual differences may influence the development of obstructive sleep apnea.

Area of Science:

  • Pediatric Sleep Medicine
  • Respiratory Physiology
  • Neuromuscular Control

Background:

  • Children with obstructive sleep apnea often maintain stable breathing despite anatomical predispositions.
  • This suggests active neuromuscular compensation plays a role in maintaining airway patency during sleep.

Purpose of the Study:

  • To evaluate muscle, ventilatory, and arousal responses to negative-pressure challenges during sleep in healthy children.
  • To investigate the role of genioglossus muscle activity (EMGgg) in airway stability.

Main Methods:

  • Utilized custom intraoral surface electrodes to record genioglossus muscle activity (EMGgg).
  • Assessed responses to controlled negative-pressure challenges during polysomnography in 19 healthy children.

Main Results:

  • Observed significant individual variability in EMGgg responsiveness (214+/-101% baseline), consistent within subjects.
  • Found a correlation between EMGgg activity, inspiratory flow, and airway collapsibility.
  • Demonstrated reflex increases in airflow (49+/-41% baseline) and respiratory rate, often sustaining ventilation without arousal.
  • Identified sleep stage-dependent arousal thresholds (highest in stage 4, lowest in REM sleep).

Conclusions:

  • Healthy children display considerable variation in upper airway neuromuscular compensation and arousal thresholds.
  • These variations may represent intermediate phenotypes influencing obstructive sleep apnea susceptibility.
  • Robust neuromuscular responses or high arousal thresholds may protect children against airway collapse during negative pressure challenges.
Abstract

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