Obesity and upper airway control during sleep

Area of Science:

• Sleep Medicine
• Respiratory Physiology
• Obesity Research

Background:

• Obstructive sleep apnea (OSA) is linked to obesity, involving upper airway anatomical and neuromuscular changes.
• Obesity-related adipose deposition increases pharyngeal collapsibility and critical pressure (P(crit)).
• Central adiposity reduces lung volume, decreasing caudal traction and increasing pharyngeal collapsibility.

Purpose of the Study:

• To review the mechanisms connecting obesity with upper airway dysfunction in OSA.
• To explore how obesity impacts upper airway anatomy and neuromuscular control.
• To examine the role of weight loss in improving OSA-related neural responses.

Main Methods:

• Review of existing literature on obesity, upper airway mechanics, and OSA.
• Analysis of anatomical and physiological factors contributing to pharyngeal collapsibility.
• Investigation of neural responses to airway obstruction and their modulation by weight loss.

Main Results:

• Obesity increases upper airway collapsibility through adipose deposition and reduced lung volume.
• Metabolic factors promoting central adiposity exacerbate upper airway mechanical dysfunction.
• Neural responses can mitigate airway obstruction, and these improve with weight loss.
• Weight loss may reduce somnogenic inflammatory mediators in the pharynx.

Conclusions:

• Obesity significantly contributes to obstructive sleep apnea via structural and functional upper airway changes.
• Weight loss offers a therapeutic strategy by improving both mechanical and neural aspects of upper airway function in OSA.
• Understanding these mechanisms highlights the importance of weight management for OSA patients.