Newton, J L, Pairman, J, Hallsworth, K et al. · QJM : monthly journal of the Association of Physicians · 2011 · DOI
This study looked at how much people with ME/CFS move around during the day compared to healthy people. Researchers found that people with ME/CFS do less intense physical activity (like brisk walking or exercise) than healthy controls, even though they spend similar amounts of time sitting. The study also found that reduced physical activity was linked to problems with heart rate regulation in ME/CFS patients.
This study identifies reduced physical activity intensity as a potentially modifiable factor in ME/CFS that is distinct from simple sedentary behaviour, challenging assumptions that ME/CFS patients are simply inactive. The finding that autonomic dysfunction—not fatigue severity—correlates with reduced activity suggests targeting autonomic regulation may be more beneficial than pushing patients to exercise harder, informing treatment approaches.
This study does not prove that low physical activity causes autonomic dysfunction or vice versa; it only shows they are associated. The cross-sectional design cannot establish causal direction or whether autonomic problems lead to reduced activity or reduced activity worsens autonomic function. The study also does not measure post-exertional malaise or explore whether activity patterns change after exertion, which is central to ME/CFS pathophysiology.
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 →
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