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A: pair of fast (thin lines) and slow (bold lines) breaths from two time points (X and Y) during the night in a control subject (6). Note that fast breaths do not produce substantially higher peak flow. B: similarly, pairs of fast (thin lines) and slow (bold lines) breaths from two time points (X and Y) during the night in a control subject (7). In this second example, there is moderate negative effort dependence with a drop from peak flow of ∼30% with increasing effort.
