Muscle RelaxationMuscle, SmoothMusclesMuscle ContractionRelaxation TherapyMuscle, Smooth, VascularMuscle, SkeletalMuscle ProteinsMuscle Fibers, SkeletalNitric OxideVasodilationMuscle DevelopmentMuscle FatigueTracheaCyclic GMPDeuteroporphyrinsAcetylcholineHSP20 Heat-Shock ProteinsNeuromuscular BlockadeNitroprussideNeuromuscular Nondepolarizing AgentsElectric StimulationRelaxationMuscle Fibers, Fast-TwitchVasodilator AgentsIsometric ContractionMuscle DenervationPenisRabbitsMuscle Fibers, Slow-TwitchMuscle TonusCalciumGuinea PigsDose-Response Relationship, DrugEndothelium, VascularMyocytes, Smooth MuscleElectromyographyOpossumsMitochondria, MuscleNitroarginineAorta, ThoracicCyclic GMP-Dependent Protein KinasesBiological FactorsNitric Oxide DonorsIsoproterenolOxadiazolesNeck MusclesTime FactorsGuanylate CyclaseOculomotor MusclesPapillary MusclesAnal CanalBromcresol GreenRats, Sprague-DawleyMuscle, StriatedSerumAndrostanolsgamma-CyclodextrinsVasoactive Intestinal PeptidePenile ErectionMuscle SpindlesNitric Oxide SynthaseAortaRespiratory MusclesRats, WistarMuscle Relaxants, CentralMuscle WeaknessAtracuriumNG-Nitroarginine Methyl EsterNitroglycerinNeuromuscular JunctionEnzyme InhibitorsMyotonia CongenitaDogsAbdominal MusclesMuscle CellsMyocardial ContractionPhenylephrineQuadriceps MuscleBiomechanical PhenomenaVecuronium BromideMasseter MuscleAdrenergic beta-AgonistsParvalbuminsMyosin-Light-Chain PhosphataseNucleotides, CyclicVasoconstrictionFacial MusclesArginineMembrane PotentialsPurinonesQuinoxalinesNeostigmineMasticatory MusclesNorepinephrineIntercostal MusclesPhosphodiesterase InhibitorsBiofeedback, PsychologySuccinylcholineMeditation