Figure 1From: Upper airway dynamics during negative expiratory pressure in apneic and non-apneic awake snorersSupine tidal flow-volume curves (control and during NEP of -5 cmH2O) and corresponding expiratory flow-time curves (only during NEP) in representative subjects of the different groups. The hatched areas under the flow measure the volume exhaled in the first 0.5 sec. (V,NEP0.5) and 1 sec. (V,NEP1) after NEP application.Back to article page