Neck MusclesNeck PainNeckHead and Neck NeoplasmsMusclesHead MovementsWhiplash InjuriesPainElectromyographyHeadMuscle, SkeletalTorticollisCervical VertebraeChronic PainNeck InjuriesPain MeasurementMuscle ProteinsBack PainMuscle, SmoothPain ManagementMuscle ContractionPostureMetabolic Detoxication, DrugFacial MusclesMuscle Fibers, SkeletalMuscle, Smooth, VascularProprioceptionLabyrinth DiseasesAccelerationMastoidMuscle DevelopmentOccipital BoneLow Back PainPain ThresholdIsometric ContractionFemoral Neck FracturesPain, PostoperativeAnti-Dyskinesia AgentsAcute PainShoulder PainTegmentum MesencephaliMovementMusculoskeletal ManipulationsMuscle FatigueTime FactorsMuscle Fibers, Fast-TwitchManipulation, SpinalMuscle DenervationPain, IntractableBiomechanical PhenomenaAbdominal PainFixation, OcularMuscle Fibers, Slow-TwitchElectric StimulationChlamydia InfectionsMyocytes, Smooth MuscleMitochondria, MuscleMuscle WeaknessMotor NeuronsVestibule, LabyrinthChronic DiseasePelvic PainFacial PainPain PerceptionCarcinoma, Squamous CellPain, ReferredOculomotor MusclesTreatment OutcomeMusculoskeletal PainMuscle Stretching ExercisesPhysical Therapy ModalitiesMuscle, StriatedOrientationMuscle SpindlesMuscle RelaxationCatsPsychomotor PerformanceMagnetic Resonance ImagingRespiratory MusclesAcupuncture AnalgesiaRotationSuperior ColliculiPapillary MusclesAbdominal Muscles