SpasmMuscle RelaxationMuscle SpasticityMusclesNeck MusclesMuscle, SmoothSpasms, InfantileCervical AtlasOccipital BoneSpinal Cord InjuriesMuscle, Smooth, VascularMuscle ContractionMuscle, SkeletalMuscle ProteinsNeuromuscular AgentsMuscle Fibers, SkeletalElectromyographyHemifacial SpasmBotulinum Toxins, Type AMotor NeuronsRelaxation TherapyMuscle DevelopmentWounds and InjuriesMuscle FatigueMuscle Fibers, Fast-TwitchCoronary VasospasmMuscle DenervationMuscle Fibers, Slow-TwitchMyocytes, Smooth MuscleFacial MusclesNitric OxideMitochondria, MuscleBrain InjuriesVasodilationTracheaEsophageal Spasm, DiffuseOculomotor MusclesAcetylcholineIsometric ContractionMuscle, StriatedElectric StimulationPapillary MusclesMuscle SpindlesRespiratory MusclesRabbitsCyclic GMPMuscle WeaknessAthletic InjuriesRats, Sprague-DawleyTime FactorsCalciumDeuteroporphyrinsVasodilator AgentsAbdominal MusclesMuscle CellsQuadriceps MuscleReperfusion InjuryHSP20 Heat-Shock ProteinsNeuromuscular BlockadeDose-Response Relationship, DrugNitroprussideGuinea PigsMasticatory MusclesMasseter MuscleEndothelium, VascularNeuromuscular Nondepolarizing AgentsPenisRats, WistarIntercostal MusclesErgonovineRelaxationMuscle TonusMuscle Relaxants, CentralMuscular AtrophySatellite Cells, Skeletal MuscleAorta, ThoracicBiomechanical PhenomenaNeuromuscular JunctionAortaPectoralis MusclesAngina Pectoris, VariantOpossumsIsoproterenolNitroarginineNitric Oxide DonorsCells, CulturedMuscular DiseasesCyclic GMP-Dependent Protein KinasesNitroglycerinNitric Oxide SynthaseDogsOxadiazolesEnzyme InhibitorsAnal CanalBiological FactorsMyofibrilsGuanylate CyclaseInjury Severity ScoreLeg InjuriesHindlimb