Meeus, Mira, Van Eupen, Inge, Willems, Joke et al. · Disability and rehabilitation · 2011 · DOI
Researchers tested whether a common activity questionnaire (IPAQ-SF) could accurately measure physical activity in people with ME/CFS. Fifty-six patients filled out the questionnaire, wore activity monitors for a week, and kept activity diaries. The questionnaire's measurements didn't match what the activity monitors and diaries showed, and it wasn't good at capturing the low activity levels typical of ME/CFS patients.
This study is important because it identifies a critical gap in ME/CFS research: the tools commonly used to measure physical activity in other populations do not work well for ME/CFS patients. Finding valid, practical measurement tools is essential for understanding disease severity, tracking patient progress, and evaluating rehabilitation interventions.
This study does not prove that activity measurement is impossible in ME/CFS, only that this particular questionnaire is unsuitable. It does not establish whether other questionnaires or measurement approaches might be valid, nor does it determine why the IPAQ-SF fails (whether due to patient recall, the questionnaire's structure, or disease-specific factors).
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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