No. Or, at the very least, can you define what you mean? I'm not a pulmonologist, but I always thought DAC was an expiratory phenomenon.In Short, Dynamic Airway Compression.
I don't understand what you're saying. Dynamic airway compression limits expiratory air flow. You almost physically can't expire faster. In diseased lungs, this limitation occurs at low expiratory flow rates. That limits exercise capacity, but how does it significantly increase the work of breathing? Expiratory flow is mostly effort-independent across most lung volumes. (As an aside, DAC is why you get breath stacking on COPDers on the vent if the expiratory time is too short.)
No worries. It wasn't you. Everybody was going off the rails with their explanations and made me start to doubt myself, hence the double edit.