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Psychosom Med. 1983 Jun;45(3):195-203.

Electrocardiographic effects of social stress on coronary-prone (type A) individuals.


Subjects selected for possession of either the Type A (coronary-prone) or Type B (coronary-resistant) behavior pattern interacted with a computer, while appearing to interact with a partner, in a formal competitive game of social strategy. Type A subjects exhibited greater impatience than Type B subjects. Computer analysis of the electrocardiogram revealed that social stimulation elicited larger ventricular electrophysiological responses (ST segment depression, and reduction of T wave and R wave amplitudes) in Type A than in Type B subjects. Such changes are consistent with the assumption of greater cardiac sympathetic activity during the social interactions in the Type A subjects.

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