HyperventilationPerfusionPressureBlood PressureHypocapniaCarbon DioxideCerebrovascular CirculationIntracranial PressureCerebral ArteriesRespirationPerfusion ImagingRegional Blood FlowMiddle Cerebral ArteryAlkalosis, RespiratoryOxygenBlood Flow VelocityPartial PressureHemodynamicsCerebral InfarctionBrainHydrostatic PressureVascular ResistanceHypercapniaBlood Gas AnalysisDogsAsthma, Exercise-InducedIntracranial HypertensionOxygen ConsumptionCoronary CirculationHeart RateIntraocular PressureCerebral PalsyMyocardial Perfusion ImagingLaser-Doppler FlowmetryHypertensionRespiratory MechanicsTime FactorsHomeostasisRenal CirculationAnoxiaBrain IschemiaPulmonary Gas ExchangeVenous PressurePulmonary VentilationVasoconstrictionCerebral VeinsCerebral AngiographyChemoreceptor CellsHypoventilationInfarction, Middle Cerebral ArteryBlood CirculationBlood Pressure DeterminationRats, Sprague-DawleyPanicRats, WistarTidal VolumeMicrocirculationBrain InjuriesVasoconstrictor AgentsMalaria, CerebralKidneyArteriesRitodrineHeartTrimethaphanArterial PressureTomography, Emission-Computed, Single-PhotonUltrasonography, Doppler, TranscranialAcid-Base EquilibriumApneaArteriolesReflexAcidosisMagnetic Resonance ImagingBlood VolumeSpectroscopy, Near-InfraredNatriuresisAirway ResistanceVasomotor SystemPanic DisorderBlood Gas Monitoring, TranscutaneousCardiac OutputVasodilationReference ValuesCerebral HemorrhageNorepinephrineDisease Models, AnimalTransducers, PressureXenon RadioisotopesMonitoring, PhysiologicVasodilator AgentsAnesthesiaVagotomyPhysical ExertionCerebrospinal Fluid PressureSympathetic Nervous SystemLactic AcidLactatesCold TemperaturePlethysmography, Impedance