Muscle RelaxationExercise TestExercise TherapyExerciseExercise TolerancePhysical ExertionRelaxation TherapyRelaxationOxygen ConsumptionPhysical EnduranceVasodilationMuscle, SkeletalMuscle ContractionHeart RateNitric OxideVasodilator AgentsBicyclingAcetylcholineRestEndothelium, VascularTime FactorsPhysical FitnessResistance TrainingRunningNitroarginineNitroprussideBlood PressureBiological FactorsAnaerobic ThresholdMuscle Stretching ExercisesMuscle, SmoothLactic AcidPulmonary Gas ExchangeMagnetic Resonance SpectroscopyMuscle, Smooth, VascularBreathing ExercisesMyocardial ContractionAorta, ThoracicHemodynamicsMesenteric ArteriesDiastoleNG-Nitroarginine Methyl EsterDose-Response Relationship, DrugMuscle FatigueVasoconstrictor AgentsRegional Blood FlowCyclic GMPPhysical Education and TrainingNitric Oxide SynthaseLegVasoconstrictionAdaptation, PhysiologicalRats, WistarGastric FundusAsthma, Exercise-InducedNorepinephrineElectric StimulationOxygenHeartAnalysis of VarianceEnergy MetabolismCardiac OutputDogsMuscle StrengthGlycogenVentricular Function, LeftExercise Movement TechniquesArteriesIndomethacinMethylene BluePhenylephrineWeight LiftingStroke VolumeArginineRats, Sprague-DawleyCoronary VesselsEnzyme InhibitorsCharybdotoxinAortaPenisRespirationBlood GlucoseOxadiazolesSportsNitroglycerinTreatment OutcomeBradykininCalciumRabbitsCardiovascular Physiological PhenomenaWalking15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidMuscle TonusPotassium ChlorideBody WeightHeart FailureTracheaApaminErgometryIsoproterenol