answer: Type A behavior strongly predict heart disease. Type A behavior is the tendency of people to show ambition, competitiveness and labor involvement, as well as impatience, temporary urgency and hostile attitudes. These behaviors would be observed only in stressful or challenging situations, the theory was proposed by Friedman and Rosenman in 1959, two cardiologists who studied the incidence of psychological aspects in coronary disease; this pattern is contrary to the pattern of conduct B.