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. 2012 Feb 15;185(4):420–426. doi: 10.1164/rccm.201109-1614OC

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Copyright © 2012 by the American Thoracic Society

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Figure 3. — Baseline (unstimulated) and peak (stimulated) maximal inspiratory airflow (V_Imax) during non-REM sleep. Maximal inspiratory airflow (V_Imax) with stimulation OFF (mean baseline unstimulated breaths) and ON (at peak flow threshold) is represented for each patient and for the group as a whole (means ± SEM). A significant increase in V_Imax was observed for the group as a whole (P < 0.001). At the peak flow threshold, flow limitation was eliminated in 17 of 30 patients (open circles, stimulation ON), and persisted in the remaining 13 patients (solid circles, stimulation ON).