Hi. Welcome to our COPD community! It's great to see you sharing your personal experience and for your question -- it is a good one. Your doctor's comment about having the "lungs of a marathon runner" sounds like a positive takeaway from your visit. However, it's completely understandable to feel frustrated by the lack of clarification from your doctor.
While COPD primarily affects the lungs, it's important to note that it can also have systemic effects like muscle weakness and fatigue due to factors such as chronic inflammation decrease in physical activity. While these symptoms are common with COPD, widespread muscle weakness, especially affecting controllable muscles from your eyes to your toes, may indicate other underlying issues beyond COPD.
It might be helpful to discuss your concerns further with your doctor and explore additional evaluations to identify any other potential causes for your symptoms. Remember, you're not alone in this journey, and being your own best self-advocate can empower you to seek the answers and support you need.
I hope that you find this brief response helpful. Wishing you all the best. John. community moderator.