Literally 100% of people with chronic illness know the "I overdid it and now it's going to take me 3 weeks to recover my previous function level" and yet researchers still seem to think it's not an important study factor.
People with #MECFS, and many with #LongCOVID experience post-exertional malaise: a flare of symptoms after activity. The response is disproportionate to the activity and can lead to permanent drops in functional capacity.
www.mayoclinicproceedings.org/article/s0025-6196(23)00402-0/fulltext
Diagnosis and Management of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a chronic neurologic disease often preceded by infection. There has been increased interest in ME/CFS recently because of its significant...