Electrocardiographic T-wave changes are more pronounced in type A than in type B men during mental work.
Phasic changes in heart rate (HR) and electrocardiographic T-wave amplitude (TWA) were monitored in healthy Type A (coronary-prone) and Type B (non-coronary-prone) men during the performance of a difficult arithmetic task. Type As showed significantly greater reductions in TWA as compared to Type Bs, though no group differences were present in HR change. This pattern of results, wherein a significant Type A-B difference was observed in a phasic measure of ventricular performance (TWA), but not in one of supraventricular performance (HR), suggests that Type As experience excessive neurally mediated sympathetic stimulation of the myocardium during mental work.
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H
Scher
L M
LM
Hartman
J J
JJ
Furedy
R J
RJ
Heslegrave
D000328:Adult; D001007:Anxiety / Q000523:psychology; D001143:Arousal / Q000502:physiology; D003327:Coronary Disease / Q000503:physiopathology / Q000523:psychology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology; D006791:Hostility; D006801:Humans; D008297:Male; D011340:Problem Solving / Q000502:physiology; D012306:Risk; D013564:Sympathetic Nervous System / Q000503:physiopathology; D014434:Type A Personality