sats become lower AFTER exercise and don't return

I use oxygen and i use a higher flow for when exercising. Recently I've been assessed so everything is right for me etc The issue im having is I was feeling great so decided to start exercising after a long long time of doing nothing more than sit on the sofa as now i have the right o2 flow to use when exercising whereas before i didnt The first day i just did 5 min light walk on the treadmill all was fine Same with the second day for longer But obviously i want to make a difference quicker and actually workout properly so decided to go for a quick walk to the point where my heart was beating quick at 150 and i couldn't walk much more as i was out of breath etc my sats where still around 90 as i never let them get too low so all was well and i felt great as it was a testing workout However after my sats never returned to what they were before i started as if my body hadn't recovered Its been two days now and still hasnt got better and my sats are like ten percent lower than what they should be when idle and its harder to breathe on the same level of o2 and obviously when moving gets even worse Any ideas what's happening as this is so annoying as I'm supposed to exercise properly to help matters but it makes it worse and stops me from doing it. So now im back to sitting on the sofa hoping the sats rise
Source: Cystic Fibrosis Exercise and Fitness Forum - Category: Respiratory Medicine Authors: Tags: Exercise & Fitness Source Type: forums