Muscle RelaxationMuscle, SkeletalMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle ProteinsMuscle Fibers, SkeletalSodium-Potassium-Exchanging ATPaseVasodilationMyostatinH(+)-K(+)-Exchanging ATPaseNitric OxideMuscle DevelopmentRelaxationAcetylcholineAdenosine TriphosphatasesIsometric ContractionMuscular AtrophyTracheaCyclic GMPMuscle StrengthVasodilator AgentsNitroprussideMuscle FatigueRabbitsCalciumSarcopeniaEndothelium, VascularMitochondria, MuscleQuadriceps MuscleElectromyographyElectric StimulationNitroarginineBiological FactorsDeuteroporphyrinsTime FactorsDose-Response Relationship, DrugExercisePenisRats, Sprague-DawleyCalcium-Transporting ATPasesHSP20 Heat-Shock ProteinsResistance TrainingAorta, ThoracicMuscle TonusAdenosine TriphosphateGuinea PigsNeuromuscular BlockadeProton-Translocating ATPasesOxadiazolesMuscle Fibers, Fast-TwitchNeuromuscular Nondepolarizing AgentsHindlimbEnzyme InhibitorsNitric Oxide DonorsKineticsIsoproterenolMuscle DenervationMuscle Fibers, Slow-TwitchPhysical EnduranceOpossumsGuanylate CyclaseNitric Oxide SynthaseNG-Nitroarginine Methyl EsterMyocardial ContractionAortaRats, WistarVasoactive Intestinal PeptideMyocytes, Smooth MuscleCyclic GMP-Dependent Protein KinasesDogsCreatineHypertrophyGlycogenMagnetic Resonance SpectroscopyAnal CanalPapillary MusclesSarcoplasmic Reticulum Calcium-Transporting ATPasesPhenylephrinePhysical ExertionPenile ErectionNitroglycerinArginineSarcoplasmic ReticulumMesenteric ArteriesVasoconstrictionRegional Blood FlowNeck MusclesBlood PressureMuscle, StriatedOculomotor MusclesAdaptation, PhysiologicalVasoconstrictor AgentsSignal TransductionMembrane PotentialsAdrenergic beta-AgonistsBromcresol GreenOrgan Size