Coronary-Prone Individuals (Type A Behavior Pattern)

Abstract
The average resting and after arginine hydrochloride infusion plasma growth hormone concentrations of relatively coronary-prone subjects (persons with type A behavior pattern) were found to be significantly lower than those of relatively coronary-resistant individuals (subjects with type B behavior pattern). This difference does not appear to be a fixed one, but is related to the intensity of the behavior pattern present at the time of study.