Muscle RelaxationMuscle, SkeletalMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle ProteinsMuscle Fibers, SkeletalVasodilationMyostatinNitric OxideMuscle DevelopmentRelaxationAcetylcholineMuscular AtrophyIsometric ContractionTracheaCyclic GMPMuscle StrengthVasodilator AgentsNitroprussideMuscle FatigueBrain ChemistryEndothelium, VascularRats, Sprague-DawleySarcopeniaTime FactorsMitochondria, MuscleElectric StimulationQuadriceps MuscleElectromyographyNitroarginineDeuteroporphyrinsDose-Response Relationship, DrugBiological FactorsExercisePenisBrain InjuriesHSP20 Heat-Shock ProteinsRabbitsResistance TrainingAorta, ThoracicMuscle TonusCalciumGuinea PigsNeuromuscular BlockadeBrain NeoplasmsNeuromuscular Nondepolarizing AgentsOxadiazolesHindlimbMuscle Fibers, Fast-TwitchRats, WistarNitric Oxide DonorsNitric Oxide SynthaseIsoproterenolMuscle DenervationGuanylate CyclasePhysical EnduranceNG-Nitroarginine Methyl EsterMuscle Fibers, Slow-TwitchAortaVasoactive Intestinal PeptideOpossumsCreatineBrain MappingMyocytes, Smooth MuscleMagnetic Resonance SpectroscopyCyclic GMP-Dependent Protein KinasesEnzyme InhibitorsMyocardial ContractionHypertrophyGlycogenAnal CanalPhenylephrineDogsAgingPapillary MusclesPenile ErectionNitroglycerinPhysical ExertionRegional Blood FlowOrgan SizeArginineMice, Inbred C57BLVasoconstrictionMesenteric ArteriesBlood PressureSignal TransductionNeck MusclesMagnetic Resonance ImagingOculomotor MusclesAdaptation, PhysiologicalMuscle, StriatedVasoconstrictor AgentsHeart RateBromcresol GreenAndrostanolsBrainNorepinephrine