Oxygen ConsumptionOxygenExercise TestBiological TransportReactive Oxygen SpeciesExerciseKineticsPhysical ExertionPulmonary Gas ExchangePhysical EnduranceGlucoseExercise ToleranceAnaerobic ThresholdLactic AcidBicyclingMuscle, SkeletalCarbon DioxideRunningLactatesBiological Transport, ActiveHeart RatePhysical FitnessEnergy MetabolismOxidation-ReductionTime FactorsAerobiosisHydrogen-Ion ConcentrationOxygen Inhalation TherapyErgometryPartnership PracticeSinglet OxygenModels, BiologicalRespirationPulmonary VentilationPhysical Education and TrainingGlucose Transporter Type 5NitrogenDeoxyglucoseSodiumPartial PressureLiverRegional Blood FlowFluorine RadioisotopesNitratesCardiac OutputPolarographyAdenosine TriphosphateDihydroxyphenylalanineMyocardiumAnaerobiosisDiffusionAdaptation, PhysiologicalMembrane Transport ProteinsTomography, Emission-ComputedMaximal Voluntary VentilationAnoxiaSarcoplasmic ReticulumRestCarrier ProteinsCarbon RadioisotopesCulture MediaRadiopharmaceuticalsTemperatureBiomassRespiratory Physiological PhenomenaMitochondriaSports MedicinePhosphatesRats, Sprague-DawleyHeartCells, CulturedPlant RootsOxygen IsotopesCitric Acid CycleCardiovascular Physiological PhenomenaOxyhemoglobinsHemodynamicsFluorodeoxyglucose F18LegPotassiumRespiratory Function TestsGlycogenIntestinal AbsorptionMonosaccharide Transport ProteinsInsulinCalciumDose-Response Relationship, DrugKneeRats, Inbred StrainsSymportersHydrogen PeroxideDogsPositron-Emission TomographyAmino AcidsPerfusionGlycolysisBlood Gas AnalysisAmmoniaWalkingCarbohydrate Metabolism