a. A type of personnel employed in healthcare
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Friedman and Rosenman (both cardiologists) actually discovered the Type A behavior by accident after they realized that their waiting-room chairs needed to be reupholstered much sooner than anticipated.
When the upholsterer arrived to do the work, he carefully inspected the chairs and noted that the upholstery had worn in an unusual way: "there's something different about your patients, I've never seen anyone wear out chairs like this."
Unlike most patients, who wait patiently, the cardiac patients seemed unable to sit in their seats for long and wore out the arms of the chairs. They tended to sit on the edge of the seat and leaped up frequently.
However, the doctors initially dismissed this remark, and it was only five years later that they began their formal research.
Friedman and Rosenman (1976) labeled this behavior Type A personality. They subsequently conduced research to show that people with type A personality run a higher risk of heart disease and high blood pressure than type Bs.
Although originally called 'Type A personality' by Friedman and Rosenman it has now been conceptualized as a set of behavioral responses collectively known as Type A behavior Pattern.