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Type A and Type B personality theory
Type A and Type B personality theory describes two contrasting personality types. In this theory, personalities that are more competitive, outgoing, ambitious, impatient and/or aggressive are labeled Type A, while more relaxed personalities are labeled Type B.
The two cardiologists who developed this theory came to believe that Type A personalities had a greater chance of developing coronary heart disease. Following the results of further studies and considerable controversy about the role of the tobacco industry funding of early research in this area, some reject, either partially or completely, the link between Type A personality and coronary disease. Nevertheless, this research had a significant effect on the development of the health psychology field, in which psychologists look at how an individual's mental state affects their physical health.〔Eysenck, H.J. (1990). Type A Behavior and Coronary Heart Disease: The Third Stage. Journal of Social Behavior and Personality, 5, 25-44.〕
== History ==
Type A personality behavior was first described as a potential risk factor for heart disease in the 1950s by cardiologists Meyer Friedman and Ray Rosenman. After an eight-and-a-half-year-long study of healthy men between the ages of 35 and 59, Friedman and Rosenman estimated that Type A behavior doubles the risk of coronary heart disease in otherwise healthy individuals. The individuals enrolled in this study were followed well beyond the original time frame of the study. Subsequent analysis indicated that although Type A personality is associated with the incidence of coronary heart disease, it does not seem to be a risk factor for mortality.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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