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. 2008 Feb 15;5(2):253–262. doi: 10.1513/pats.200707-111MG

Figure 4.

Figure 4.

Raw data from three normal children during stage 4 sleep, demonstrating the range of genioglossus EMG (EMGgg) responsiveness and nasal airflow (Flow) during six negative pressure challenges. Each tracing represents approximately 4 minutes. (A) No increase in the EMGgg or flow is evident during the negative pressure challenges. (B) A small increase in the EMGgg occurs during challenges 2–6. An increase in inspiratory flow is evident on breaths 4 and 5 during challenges 2–4. (C) A brisk EMGgg response accompanies challenges 2–6 and is associated with flow at or above baseline without arousal. Reproduced by permission from Reference 61.