Abstract
The aim of this study was to evaluate the temporal stability and the situational specificity of the intra-anal EMG-activity, as well as the individual specificity of this response in dyssynergic defecation patients. With this purpose, 26 individuals (13 with dyssynergic defecation and 13 without anorectal pathology) participated in two sessions of psychophysiological assessment, with an inter-session period of 1 week. At each session, the EMG-activity of external anal sphincter was recorded under four different conditions (baseline, voluntary contraction, reflex contraction and simulated defecation). The findings provide empirical evidence about temporal stability of the intra-anal EMG-activity, situational specificity of this response and the existence of a specific profile of intra-anal EMG-activity characteristic of patients with dyssynergic defecation.
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