Background: Patients with fibromyalgia often feel disabled in the performance of daily activities. Psychological factors seem to play a pronounced disabling role in fibromyalgia.

No abstract

The current evidence of the reproducibility of RUSI for measuring abdominal muscle activity is based mainly on studies with suboptimal designs and the study of people who were healthy. The critical question of whether RUSI provides reliable measures of improvement in abdominal muscle activity remains to be evaluated.

Task experience did not significantly influence test-retest differences. All tasks showed sufficient test-retest reliability. Based on the natural variability of the tasks, the 5-min walking and stair-climbing task, and to a lesser degree the 50-ft (15 m) walking, sit-to-stand and loaded forward reach, seem clinically useful. There are major concerns about the usability of the PILE.

CLBP patients, especially men, seem to have a reduced aerobic fitness level compared with the normative population. No explanatory factor for that loss could be identified.