Relaxation training for chronic pain patients using EMG feedback: an analysis of process and outcome effects

The purpose of the present study was to clarify the role of EMG-based relaxation training for a diverse group of chronic pain patients by examining in detail both process and outcome changes. Eighteen pain clinic patients were each given 10 sessions of relaxation training using frontalis feedback. The results of the study do not support the use of relaxation training as a standard procedure for chronic pain patients. Psychophysiological assessment carried out before and after training indicated some reduction in EMG levels, with less change in GSR and HR activity. No significant alteration occurred in mean pain and medication measures after training, although there was a trend for sedative/hypnotic usage to be smaller. Most important, individual differences in outcome were not consistently related to process variables monitored during training. This lack of association supports the view that physiological change is not necessary for clinical benefit after relaxation training.