<P> 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 . They discovered that their patients were wearing out the arms and upholstery on the chairs in the waiting room 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 . Participants were asked to fill out a questionnaire , that asked questions like `` Do you feel guilty if you use spare time to relax ? '' and `` Do you generally move , walk , and eat rapidly ? '' 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 . </P>
<P> 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 . They discovered that their patients were wearing out the arms and upholstery on the chairs in the waiting room 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 . Participants were asked to fill out a questionnaire , that asked questions like `` Do you feel guilty if you use spare time to relax ? '' and `` Do you generally move , walk , and eat rapidly ? '' 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 . </P>
who came up with type a and b personality
who came up with type a and b personality
Meyer Friedman and Ray Rosenman .
Meyer Friedman and Ray Rosenman .