The aim of this study was to investigate the hypothesis that the perception of the apparent amount of voluntary control over muscle activity determines the efficacy of EMG biofeedback treatment in back-pain patients. Twenty-four patients with nonorganic or minor organic back pain were randomly assigned to three training conditions: low-success, high-success and linear feedback of training performance. Contrary to expectations about the relationship between perceived control over muscle tension and pain, no differences in the effects of treatment were found between these three experimental groups. Statistically and clinically significant treatment gains were, however, found in all groups. Thus, the hypothesis of a relationship between perceived muscle tension reduction and pain reports in chronic back-pain patients is not confirmed. After a close analysis of the training sessions, and the muscle activity reduction actually obtained, an alternative hypothesis about EMG biofeedback training procedures is formulated.
With permission from Excerpta Medica Inc.

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