Figure 6.

Peak and tonic muscle activity for the genioglossus (EMGgg Peak and EMGgg Tonic) (A and B) and tensor palatini (EMGtp Peak and EMGtp Tonic) (C and D) muscles for inspiratory (Insp) (closed symbols) and expiratory (Exp) (open symbols) arousals. Data [expressed as estimated marginal mean (confidence interval)] are for the first two breaths following CPAP reduction (Breaths 1 and 2), and the three breaths prior to arousal (Breaths −3 to −1; Breath −1 is immediately prior to arousal), expressed as a change (∆) from baseline therapeutic CPAP (Breath 0). There were greater increases in EMGtp Peak for Exp arousals compared with Insp arousals. *p < 0.05 for Insp vs. Exp arousals. # p < 0.05 vs. Breath 0, + p < 0.05 vs. Breath 1, ^ p < 0.05 vs. Breath 2, ϕ p < 0.05 vs. Breath −3, – p < 0.05 vs. Breath −2.