Hi Lindy, and thanks for your post. Remember, it is just a suggestion. You may be aware the rationale behind extending one's exhalation phase to be 1 1/2 times longer than one's inhalation phase is to mimic normal breathing.
For some folks with COPD, the challenge to breathing is during the exhalation phase. COPD is an obstructive disease so it can be more difficult to get the air out, than it is it breathe in.
If you can do this (when you are thinking about it, as you shared), that is a good exercise.
If you find it easier to do (and are successful), while you are using the oxygen concentrator, I would suggest that is when you do this type of breathing. Depending on the portable unit you have, it may not be putting out sufficient oxygen for you to accomplish this easily.
What do you think?
Leon (site moderator COPD.net)