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Emg Response Patterns to Cognitive and Emotional Stress in Patients with Myofascial Pain Dysfunction Syndrome (MPD)

We tested the hypothesis that patients sUffering from myofascial pain dysfunction syndrome (MPD) display a stereotypic response to emotional but not to cognitive stress via increased activity in different fascial muscles (Kapel et al., 1989). 20 MPD patients and 20 matched control sUbjects were exposed to one cognitive (mental arythmetic) and two emotional stress (stressful slides) situations. During the baseline and the stress situations heart rate levels were recorded along with bilateral EMG activity from the muscles masseter, temporalis and frontalis. Questionaires should be provided information about depression, pain character, pain intensity and medication intake. The pain intensity was recorded by a TV managed rating scale each five minutes during the experiment. Multivariate analysis of covariance (baseline as covariate variable) with repeated measures (ANOVA) for fascial muscles and periods show significant interactions for groups, muscles and periods. Both groups showed fascial activities to the stressors. MPD patients showed a differentially higher EMG response in temporal muscles during emotional stress. More over MPD patients showed higher resting EMG levels than normal controls in these muscles. The healthy group showed increased EMG response only during cognitive stress. In conclusion the results provide support to the view of a combined stimulus response specifity and an individuel response stereotype (Engel, 1960).