(06-11-2015, 03:11 PM)quiescence at last Wrote: I have posted that normal non-REM sleep breathing halts briefly after the exhale, as seen in Sleeprider's chart above. normal awake non-sleeping has no halt - just continuous inhale exhale inhale exhale. In REM sleep, normal breathing is abnormal-ish and awake-ish. It generally has no halt (as in awake) and it usually has bizarre-ish respiration and tidal volume shiftiness. I hope that is crystal-clear.
QAL
Clear enough.
This is fascinating stuff, and stuff I did not know about.
But the pattern seems to not show a pause
after the exhale as much as it does
during mid-inhale. The spikeness at the bottom of the cycle seems to indicate that inhalation starts immediately after full exhalation, and that there is no pause of any kind there, and then half-way through inhalation it levels off (essentially halts), and then starts to increase on its way to full inhalation.
The steady fall during exhalation seems to represent normal exhalation, which is not a process driven by the CNS, but by simply no longer sending any "constrict" commands to the diaphragm, which means the lungs then just let out the inhaled air passively like a balloon having the air let out of it.
But that pause in mid-inhale is interesting. If that happens consistently, the xPAP should be able to tell when you are asleep, and when you are either awake or in REM. But, it doesn't. So maybe it just isn't reliable enough to base that conclusion on.
It also puzzles me as to exactly why that pause occurs.