Abstract
Objectives To compare autonomic nervous system (ANS) activity and somatic symptoms in chronic abdominal pain (CAP) patients and well children during (a) resting baseline, (b) training in a cognitive task, and (c) random assignment to success vs. failure on the task. Methods The ECG was continuously recorded with a dual lead system (Biopac) in 45 CAP patients and 22 well children, ages 9–16 years (mean age=12.3). Heart rate variability (HRV) was analyzed during the 5-min resting baseline, training, and success/failure on the task. Performance expectations were assessed before the task. Gastrointestinal (GI) and non-GI somatic symptoms were assessed before and after the task. Results Compared to well children, CAP patients reported lower expectations for their task performance and higher GI symptoms ( P's<.05). During success, CAP patients exhibited significant increases in both sympathetic ( P<.05) and parasympathetic ( P<.05) activity, whereas well children exhibited no change in ANS activity. During failure, CAP patients exhibited significant increases in somatic symptoms (<.05) but no change in ANS activity. Conclusions The lower performance expectations of CAP patients compared to well children may have influenced their experience of success and contributed to differences in their autonomic activity.
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