Exercise intolerance symptom of long COVID

Dear Doctors: I’ve been an endurance athlete my whole adult life. After having COVID-19, I’ve gone from running marathons at an 8-minute mile pace to needing walking breaks whenever I run. Are there studies about long COVID and endurance? How do I find one I can join?

Dear Reader: You have introduced an important topic that will be of interest to many readers. The issue of long COVID – and of COVID…