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Psychosomatic Medicine, Vol 60, Issue 5 604-609, Copyright © 1998 by American Psychosomatic Society

ORIGINAL ARTICLES

Cardiorespiratory symptoms in response to physiological arousal

AJ Barsky, JE Orav, BA Delamater, SA Clancy and LH Hartley
Division of Psychiatry, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.

OBJECTIVE: To develop a laboratory paradigm for assessing the tendency to amplify somatic symptoms and report bodily distress. METHOD: Reports of four different cardiopulmonary symptoms were obtained during standardized, treadmill exercise, while the physiological parameters which induce these symptoms were simultaneously measured. Two indices were developed to compare symptom reporting across patients: symptom severity after reaching 80% of predicted, maximal exercise capacity; and the magnitude of physiological arousal necessary to induce an initial sensation of discomfort. RESULTS: Fifty-one medical outpatients with a chief complaint of palpitations were studied. Symptom distress at 80% of maximal exercise capacity was significantly associated with state anxiety and daily life stress. The complaint of "heart racing" first occurred at a significantly lower heart rate for patients who were older, more anxious, and reported more daily life stress. Measures of hypochondriasis, somatization, bodily amplification, and bodily absorption were not significantly associated with either symptom measure. CONCLUSIONS: Standardized exercise testing may provide a suitable paradigm with which to study the tendency to amplify symptoms and to somatize. The distress reported by different subjects at 80% of maximal exercise capacity may be considered an index of the discomfort engendered by a standardized stimulus, whereas the point of onset of discomfort may be a measure of the patient's threshold for becoming symptomatic. These findings are not conclusive, but do suggest that patients who are more anxious and under more stress tend to report more intense cardiopulmonary symptoms at comparable levels of physiological arousal, and to have a lower threshold for experiencing discomfort.


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