Debbie posted this last week as a comment. I'm re-posting it as a question, to make it easier to find again. It is both very technical and informative. While meant for clinicians, us patients can gleam vital facts from it that can improve our state. It took me several days to read!
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They discuss the paradox we all experience - While exercise begets SOB; a sedentary life style only worsens our quality of life.
clipper (Debbie) - NJ State Captain This is a really informative paper on why people with COPD get short of breath (dyspnea) with activity. I had to look a number of things up and I will need to read it a few times but this is worth the effort.
https://www.dovepress.com/activity-related-dyspnea-in-chronic-obstructive-pulmonary-disease-phys-peer-reviewed-fulltext-article-COPD