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Raw data from a five-breath negative-pressure challenge demonstrating progressively increasing phasic EMGgg activity during breaths 1–4. Subsequently, the EMGgg decreases in breath 5 after a normal breath flow profile had been reestablished. Inspiratory flow is observed to be flow limited during breaths 1–2, flow limited followed by a flow response (arrows) in breaths 3–4, and non–flow limited in breath 5.
