Chronic Fatigue and Postexertional Malaise in People Living With Long COVID: An Observational Study.
Twomey, Rosie, DeMars, Jessica, Franklin, Kelli et al. · Physical therapy · 2022 · DOI
Quick Summary
This study looked at 213 people with long COVID to measure how severe their fatigue and postexertional malaise (PEM—worsening of symptoms after activity) were. Researchers found that over 71% had chronic fatigue as severe as or worse than other serious illnesses, and nearly 59% experienced PEM similar to what people with ME/CFS report. The study highlights that fatigue and symptom flare-ups after activity are major problems that need careful monitoring and should shape how doctors design rehabilitation programs.
Why It Matters
This study provides empirical evidence that long COVID-associated fatigue is clinically significant and comparable in severity to ME/CFS, strengthening recognition of long COVID as a serious post-viral condition. The finding that most participants experience PEM underscores why standard rehabilitation approaches may be harmful and why pacing-based strategies deserve clinical priority. This work validates patient-reported experiences and builds the evidence base for tailored, individually-designed interventions.
Observed Findings
Mean FACIT-F score of 18/52 (lower=more severe fatigue) in 213 long COVID participants
71.4% of participants met criteria for chronic fatigue
58.7% met postexertional malaise (PEM) scoring thresholds used in ME/CFS populations
Postexertional symptom exacerbation affected most study participants
Fatigue severity in long COVID comparable to or worse than in other established clinical conditions
Inferred Conclusions
Long COVID is characterized by clinically relevant chronic fatigue of similar or greater severity than several other clinical disorders
PEM is a significant and prevalent challenge affecting rehabilitation outcomes in long COVID
Rehabilitation programs must be individually tailored and include monitoring for postexertional deterioration
Pacing-based self-management strategies should be prioritized to minimize postexertional symptom exacerbation
Remaining Questions
How do fatigue severity and PEM characteristics change longitudinally in long COVID, and which patients are most at risk for persistent or worsening symptoms?
What This Study Does Not Prove
This study does not establish causality or mechanisms underlying fatigue and PEM in long COVID. It cannot determine whether long COVID and ME/CFS share identical pathophysiology, only that fatigue severity is comparable. The cross-sectional design means we cannot track how fatigue or PEM evolve over time or predict which interventions will be most effective for individual patients.