ChicagoGranny wrote: ↑Fri May 01, 2020 10:44 am
Garabeca wrote: ↑Fri May 01, 2020 9:39 am
The AHI is increasing because the pressure is too low ( due to an increased demand from the lungs for more air intake, due to metabolism change for the 24-48 window following exercise) Therefore the pressure is not sufficient, therefore the airways collapse.
Deeper breathing doesn't at all explain why the airway would be more subject to collapse and therefore need more pressure from the CPAP.
The movement of the human diaphragm controls the airflow as long as the airway is open. The CPAP is not used to deliver air to the lungs. It's only used to splint the airway open.
Do you or anyone else reading this thread have any scientific references that explain why the airway would be more subject to collapse with deeper breaths?
I am speaking out of experience, scientifical evidence is not an absolute must if this can help others from what i've realized for myself, especially if it doesn't hurt to explore and try for yourself. Worst case, if higher pressure on those exercise days doesn't help, You can just go back to the pressure you were on. Also experience in some instances can speak volumes, sometimes more than scientifical evidence because often studies yield results and empirical evidence based on patient experience. I know that the diagphragm can be more easily scientifically studied due to an obvious mechanism that could be based on sleep depth (REM for example is known for airway collapse). But based on common sense, deeper breathing demands more air in the airways therefore subjecting diaphragm to more resistance prone reactions. Also you are correct to say that my theory is incomplete once again because indeed, deeper sleeping can or will make the diagphragm collapse more as well which is definitely contributing to the issue. So i will agree that it is not solely based on oxygen/airflow demand but also by the level of collapse depending on the depth of sleep induced by exercise. Mind you, overexercising might actually disrupt deep stages of sleep. In any case, for metabolism
related changes sensitive to various levels of exercise (the more the exercise intensity, the stronger the metabolism response) 24-48 hours is what i noticed for me, it could be more or less for others but it would be fair to assume for the sake of this suggestion, that at least a 24 hour period would be a good reference range for people experiencing this issue. And my observation in this situation is strictly on metabolism, this is regardless of the depth of sleep (overtraining could actually disrupt sleep depth) Again this is my experience and just hoping it can help people to whom this applies to as they will have nothing to lose by trying. Also i suggested the increase to be a cm more or less, nothing dramatic, just enough to see if it makes you more comfortable.
So i wanted to pass it on