Limited evidence was found for the psychometric properties and clinical usability of these instruments .
However , the CFS-activities and participation question naire ( APQ ) is a disease-specific instrument with moderate content and construct validity .
PURPOSE To summarize measurement instruments used to evaluate activity limitations and participation restrictions in patients with chronic fatigue syndrome ( CFS ) and review the psychometric properties of these instruments .
Chronic fatigue syndrome causes activity limitations and participation restrictions in one or more areas of life .
Identifying physical activity patterns in chronic fatigue syndrome using actigraphic assessment.
OBJECTIVE Changes in physical activity are thought to play an important role in maintaining symptoms in chronic fatigue syndrome ( CFS ) . The aim of this study was to describe intraindividual physical activity patterns in more detail and to identify pervasively passive patients . METHODS With help of a movement-sensing device , physical activity levels were registered continuously over a 12-day period in 277 CFS patients . Within this registration period , the 10 largest activity peaks were computed . The intensity and duration of these activity peaks and their subsequent rest periods were described and compared to those of 47 healthy controls . In addition , the patients ' 12 daily activity scores were used to identify patients who were characterised by low levels of physical activity throughout the registration period . RESULTS The CFS sample had less intense and shorter activity peaks , while the average rest periods that followed these peaks lasted longer . Approximately one-fourth of the CFS sample differed distinctly from the control group and was labelled as pervasively passive . CONCLUSION The measurements and classification of actual physical activity levels were found to reduce heterogeneity in the CFS population and therefore could provide the opportunity to optimise behavioural intervention protocol s for CFS
Limited evidence was found for the psychometric properties and clinical usability of these instruments .
However , the CFS-activities and participation question naire ( APQ ) is a disease-specific instrument with moderate content and construct validity .
PURPOSE To summarize measurement instruments used to evaluate activity limitations and participation restrictions in patients with chronic fatigue syndrome ( CFS ) and review the psychometric properties of these instruments .
Chronic fatigue syndrome causes activity limitations and participation restrictions in one or more areas of life .