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Subgrouping in Chronic Fatigue Syndrome Based on Actigraphy and Illness Severity – Source: Open Biology Journal, Apr 2009

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By Mariya Zaturenskaya, Leonard A Jason, et al. • www.ProHealth.com • April 1, 2009


[Note: to read the full text of this open-access article, click here]

Participants with chronic fatigue syndrome were categorized into subtypes based on actigraphy and illness self report symptom severity data. [Actigraphy is a measure of activity level determined by a small monitor worn on the waist that collects and compiles data on the subject’s movement and movement intensity. The illness self report data were collected in a battery of questionnaires.]

• Each method identified two groups of patients, one with severe and one with less severe manifestations of the illness.

• For both subtypes, those in the more severe category had more physical functioning problems than those in the less severe categories.

However, for the illness self-report symptom group, those in the more severe category had:

• Significantly more impairment in sleep, anxiety, depression, and pain,

• And more concurrent psychiatric status and Fibromyalgia…

…than those in the less severe category.

In contrast, those in the more severe actigraphy subtype group in comparison to the less severe group had more impairment in quality of life and cortisol readings. [Cortisol is secreted in a daily physiological ‘activation’ cycle, normally highest in the morning on wakening, lowest at night. All subjects provided a series of saliva samples (a measure of cortisol) taken over the course of a day.]

These findings suggest that CFS subtypes based on symptom severity and amount of activity identify different groups of patients with varying types of impairments.

Source: Open Biology Journal, Apr 2009; vol 2, pp 20-26. Zaturenskaya M, Jason LA, Torres-Harding S, Tryon WW. University of Cincinnati; Center for Community Research, DePaul University, Chicago, Illinois; Roosevelt University; Fordham University, USA. [E-mail: LJason@depaul.edu]





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