Children's Activity and Nutrition III was originally part of the Institute-initiated Studies of Children's Activity and Nutrition (SCAN), first funded in 1985. Children's Activity and Nutrition III was renewed in 1992 as a stand-alone project with a focus on assessment of the development of hemodynamic mechanisms responsible for blood pressure (BP) control within the context of ethnicity and family history of early myocardial infarction (MI), defined as having a parent or grandparent with an MI at less than 55 years of age and a family history.