Loades, M E, Chalder, T, Smakowski, A et al. · Journal of psychosomatic research · 2021 · DOI
This study looked at how adolescents with ME/CFS approach and perform a simple exercise task (standing up and sitting down repeatedly) compared to healthy teenagers and those with asthma. Teens with ME/CFS took longer to complete the task, expected to do worse beforehand, felt the effort was much harder, and felt more anxious about it—patterns that parents noticed too. The researchers suggest that difficult past experiences with exercise may lead to lower confidence and worry that affects how people with ME/CFS approach physical activity.
Understanding the psychological dimensions of exercise anticipation and anxiety in ME/CFS may help explain why patients struggle with activity and how negative expectations develop. This research could inform more targeted psychological interventions or exercise approaches that address both the physiological and cognitive-emotional barriers to activity in adolescents with ME/CFS.
This study does not prove that anxiety and low expectations *cause* ME/CFS symptoms or poor exercise tolerance—only that they are associated. The cross-sectional design cannot establish whether negative expectations develop as a result of genuine post-exertional malaise or other physiological limitations, or to what extent psychological factors contribute independently. The study used a single, brief exercise task and may not reflect responses to more prolonged or intense activity.
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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