The development of an instrument to assess post-exertional malaise in patients with ME/CFS (Jason et al., 2018)

Pyrrhus

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This paper establishes a questionnaire that can measure Post-Exertional Malaise (PEM).
(I don't think this paper from 2018 has been discussed yet.)

The development of an instrument to assess post-exertional malaise in patients with myalgic encephalomyelitis and chronic fatigue syndrome (Jason et al., 2018)
https://journals.sagepub.com/doi/10.1177/1359105318805819

Excerpt:
Jason et al 2018 said:
Post-exertional malaise, or a variation of this term, is a key symptom of myalgic encephalomyelitis and chronic fatigue syndrome, as this symptom is mentioned in almost all myalgic encephalomyelitis and chronic fatigue syndrome case definitions. Until now there has not been a comprehensive questionnaire to assess post-exertional malaise. To rectify this situation, in this article we describe the development of a new questionnaire, called the DePaul Post-Exertional Malaise Questionnaire, which was based on input from hundreds of patients. Preliminary validation was provided by the findings of significant and predictable relationships between different domains of this post-exertional malaise questionnaire and physical functioning.