Muscle RelaxationMuscle, SkeletalMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyElectric StimulationMuscle, Smooth, VascularMuscle ProteinsMuscle Fibers, SkeletalVasodilationNitric OxideMyostatinMuscle DevelopmentRelaxationAcetylcholineIsometric ContractionElectric Stimulation TherapyTracheaCyclic GMPMuscular AtrophyMuscle StrengthVasodilator AgentsNitroprussideMuscle FatigueTime FactorsElectromyographyRats, Sprague-DawleyEndothelium, VascularCalciumDose-Response Relationship, DrugSarcopeniaQuadriceps MuscleMitochondria, MuscleRabbitsNitroarginineGuinea PigsPenisBiological FactorsDeuteroporphyrinsExerciseMuscle TonusHSP20 Heat-Shock ProteinsIsoproterenolResistance TrainingAorta, ThoracicHindlimbNeuromuscular BlockadeNeuromuscular Nondepolarizing AgentsRats, WistarOxadiazolesMuscle Fibers, Fast-TwitchNitric Oxide DonorsNitric Oxide SynthaseGuanylate CyclaseSignal TransductionMuscle DenervationEnzyme InhibitorsNG-Nitroarginine Methyl EsterVasoactive Intestinal PeptidePhysical EnduranceMyocardial ContractionMuscle Fibers, Slow-TwitchAortaDogsOpossumsMyocytes, Smooth MuscleStimulation, ChemicalPhenylephrineCyclic GMP-Dependent Protein KinasesGlycogenNorepinephrineAdrenergic beta-AgonistsAnal CanalHypertrophyCells, CulturedPenile ErectionPapillary MusclesCreatineKineticsVasoconstrictionBlood PressureRegional Blood FlowArgininePhysical ExertionNitroglycerinMice, Inbred C57BLMesenteric ArteriesPhysical StimulationMagnetic Resonance SpectroscopyMembrane PotentialsHeart RateInsulinCatsNeck MusclesQuinoxalinesCyclic AMPVasoconstrictor AgentsNeuromuscular JunctionAdaptation, Physiological