Physical function and psychosocial outcomes after a 6-month self-paced aquatic exercise program for individuals with myalgic encephalomyelitis/chronic fatigue syndrome. — CFSMEATLAS
Physical function and psychosocial outcomes after a 6-month self-paced aquatic exercise program for individuals with myalgic encephalomyelitis/chronic fatigue syndrome.
Broadbent, Suzanne, Coetzee, Sonja, Calder, Angela et al. · European journal of applied physiology · 2025 · DOI
Quick Summary
This study tested whether gentle water-based exercise could help people with ME/CFS. Thirty-two people were split into two groups: one did 20-minute water exercise sessions twice a week for 6 months, while the other group didn't exercise. The exercise group improved their walking distance, leg strength, and reported less fatigue and depression, without experiencing any symptom flare-ups or harm.
Why It Matters
Most ME/CFS patients avoid exercise due to fear of symptom worsening, making this study important because it demonstrates that carefully controlled, self-paced aquatic exercise can be safe and beneficial. The improvements in both physical function and mental health suggest a non-pharmacological approach that addresses multiple dimensions of ME/CFS burden. These findings may help reshape clinical guidance around activity management in ME/CFS.
Observed Findings
6-minute walk test distance increased 13.7% in the intervention group (P<0.001)
Sit-to-Stand performance improved 33.7% in the intervention group (P<0.001)
Fatigue scores decreased 29.5% in the intervention group (P=0.005)
Depression scores decreased 21.7% in the intervention group (P=0.010)
No adverse events or symptom worsening occurred during the 6-month trial
Inferred Conclusions
Self-paced, low-to-moderate intensity aquatic exercise can improve physical function and reduce fatigue and depression in ME/CFS without triggering symptom exacerbation
The self-paced nature of the intervention appears critical—patients exercised within their energy limits rather than following fixed intensity protocols
Aquatic exercise may offer mental health and cardiovascular benefits alongside physical improvements in this population
Remaining Questions
Do the observed improvements persist 6-12 months after the intervention ends, or does detraining occur?
What is the optimal frequency and duration for aquatic exercise in ME/CFS, and can intensity be progressed safely for some patients?
What This Study Does Not Prove
This study does not prove that aquatic exercise works for all ME/CFS patients or is superior to other interventions, as it lacks comparison groups using different exercise modalities. It cannot establish optimal exercise duration or intensity beyond the tested protocol, nor whether benefits persist long-term after the intervention ends. The small sample size and specific patient characteristics limit generalizability to the broader ME/CFS population.