E2 ModeratePreliminaryPEM unclearCross-SectionalPeer-reviewedMachine draft
Exercise testing in children and adolescents with chronic fatigue syndrome.
Takken, T, Henneken, T, van de Putte, E et al. · International journal of sports medicine · 2007 · DOI
Quick Summary
This study tested how well 20 young people with ME/CFS could exercise on a stationary bike and measured their oxygen use. The researchers found that most of these young people had similar exercise capacity to healthy peers their age, though a smaller group showed reduced fitness. The amount of fatigue they experienced was related to how active they were in daily life.
Why It Matters
This study is important because it challenges assumptions about exercise capacity in pediatric ME/CFS by showing that most young patients retain relatively normal absolute exercise capacity despite reduced relative fitness. Understanding which patients have objectively reduced versus preserved exercise capacity may help guide individualized management approaches and inform discussions about post-exertional malaise versus deconditioning.
Observed Findings
- Relative peak oxygen uptake (ml/kg/min) was significantly reduced with Z-score of -1.13 ± 1.41 (p = 0.002) compared to reference values.
- Absolute peak oxygen uptake (Z = -0.33) and maximal workload (Z = -0.93) showed only modest reductions without statistical significance.
- Heart rate and blood pressure at peak exercise were significantly lower than reference values.
- Fatigue levels were positively associated with age and negatively associated with blood pressure at peak exercise.
- Maximal exercise testing was feasible to perform in young people with CFS without adverse events reported.
Inferred Conclusions
- Maximal exercise capacity is reduced only in a minority of children and adolescents with CFS, suggesting heterogeneous exercise physiology within this population.
- Current physical activity levels are an important determinant of exercise capacity in pediatric CFS patients.
- Cardiovascular responses at peak exercise are blunted compared to healthy peers, which may contribute to reduced relative fitness.
Remaining Questions
- Does a single maximal exercise test predict post-exertional malaise symptoms, and if so, what threshold values are clinically relevant?
- What proportion of the reduced relative oxygen uptake reflects true pathophysiological impairment versus deconditioning from activity restriction?
What This Study Does Not Prove
This study does not prove whether reduced relative oxygen uptake reflects pathophysiology of ME/CFS or results from deconditioning due to activity restriction. It does not establish whether a single maximal exercise test can predict post-exertional malaise (PEM), which requires assessment of symptom responses after exercise. The small sample size and lack of control group limits generalizability to the broader pediatric ME/CFS population.
Tags
Symptom:Fatigue
Phenotype:Pediatric
Method Flag:PEM Not DefinedNo ControlsSmall Sample
Metadata
- DOI
- 10.1055/s-2007-964888
- PMID
- 17357961
- Review status
- Machine draft
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
Spotted an error in this entry? Report it →