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Exploratory analysis of the relationships between aerobic capacity and self-reported fatigue in patients with rheumatoid arthritis, polymyositis, and chronic fatigue syndrome
PM&R, 07/22/09

Weinstein AA et al. – Data confirm that patients with chronic, but stable rheumatoid arthritis (RA), polymyositis (PM), or chronic fatigue syndrome (CFS) are fatigued and have significantly decreased aerobic capacity. Self-reports of physical activity predicted VO_2peak, and may be used as an indicator of activity-based aerobic capacity, however,it did not correlate with VO_2peak.

Methods

Study aims to investigate whether:
- Self-reported levels of physical activity and fatigue are related to peak oxygen uptake (VO_2peak), and
- Whether these relationships differ among the patient groups (RA, PM, and CFS)
2 ambulatory research clinics at the NIH Clinical Center, Bethesda, MD
9 pts with PM, 10 with RA, and 10 with CFS
All patients met case criteria for their respective diagnoses
Outcome measures: VO_2peak during bicycle ergometry and self-reported fatigability, fatigue, and physical activity
VO_2peak was used as the criterion measurement of physiological fatigue with which the self-reported variables were compared

Results

The Pearson r revealed that self-reported physical activity correlated with VO_2peak
However, fatigability and fatigue did not correlate with VO_2peak
A trend in the data showed a distinctive relationship between fatigue/fatigability within the 3 groups
In addition, when controlling for group status, self-reported activity predicted aerobic capacity as measured by VO_2peak

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