Figure 4 Average relationship between epiglottic pressure (PEPI) and peak inspiratory genioglossal EMG (EMGGG Peak) in patients with obstructive sleep apnoea (OSA) and non‐snorers during reduced continuous positive airway pressure (CPAP) when recovery of ventilation did and did not occur. PEPI and EMGGG Peak were plotted for every breath during CPAP drops in each subject and the slope and intercept of the linear regression determined for when recovery of ventilation did and did not occur. The mean regression lines are shown with the length of the line determined by the average minimum PEPI in each condition. The slopes, intercepts and minimum PEPI were not different in either group or recovery condition.