Life Change EventsStress, PsychologicalStress, PhysiologicalCharacterType A PersonalitySoutheastern United StatesRestraint, PhysicalStress Disorders, Post-TraumaticAdaptation, PsychologicalPituitary-Adrenal SystemHypothalamo-Hypophyseal SystemDepressionCorticosteroneAnxietyAffectHydrocortisoneBehavior, AnimalQuestionnairesAmygdalaSocial SupportRats, Sprague-DawleyTime FactorsRisk Factors