RestChromosome DisordersChromosome AberrationsKaryotypingBed RestMagnetic Resonance ImagingInfant, NewbornFollow-Up StudiesUltrasonography, PrenatalProspective StudiesPrognosisPregnancyEchocardiographyTime FactorsBrainMutationPhenotypePredictive Value of TestsRisk FactorsPhysical ExertionSeverity of Illness IndexSensitivity and SpecificityRetrospective StudiesTreatment OutcomeExerciseExercise TestHeart RateAbnormalities, MultipleOxygen ConsumptionMuscle, SkeletalHemodynamicsBlood PressureCoronary CirculationRegional Blood FlowHeartElectrocardiographyCongenital AbnormalitiesDobutamineBlood Flow VelocityCardiac OutputEye AbnormalitiesPulmonary Gas ExchangeStroke VolumeRespirationOxygenTomography, Emission-Computed, Single-PhotonReference ValuesHyperemiaPhysical EnduranceEchocardiography, StressBicyclingVentricular Function, LeftLegVascular ResistanceDipyridamoleMuscle ContractionLactic AcidAnalysis of VarianceExercise ToleranceSympathetic Nervous SystemNitrogen RadioisotopesSyndromePhysical Conditioning, AnimalCase-Control StudiesEchocardiography, DopplerCoronary DiseaseCarbon DioxideVentricular Dysfunction, LeftHeart VentriclesReproducibility of ResultsImage Processing, Computer-AssistedCardiovascular AbnormalitiesCraniofacial AbnormalitiesPostureGated Blood-Pool ImagingMyocardial ContractionValsalva ManeuverDiastoleEnergy MetabolismSystoleVasodilator AgentsElectromyographySkin AbnormalitiesAutonomic Nervous SystemEpinephrineRespiratory MechanicsTomography, Emission-ComputedMyocardial IschemiaForearmPain, PostoperativeBaroreflexUrogenital AbnormalitiesDyspneaHeart FailureOrganotechnetium CompoundsPhosphocreatineMyocardiumTrisomyMyocardial Perfusion ImagingPulmonary Circulation