Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Simplified model of the ‘balance of forces’, factors that promote closure or patency of the upper airway. During sleep the central drive to activate the upper airway dilator muscles is diminished, which leads to an imbalance in favour of the forces promoting closure of the upper airway, other confounders might ‘tip the balance’ due to an older age or male gender.
