Back InjuriesSpasmLiftingMuscle SpasticityAccidents, OccupationalNeck MusclesSpasms, InfantileBackLow Back PainBack PainCervical AtlasOccipital BoneSpinal Cord InjuriesNeuromuscular AgentsAthletic InjuriesSaskatchewanMusclesOccupational DiseasesHemifacial SpasmBotulinum Toxins, Type AMotor NeuronsWounds and InjuriesElectromyographyOccupational Health ServicesMuscle ProteinsMuscle, SmoothMuscle, SkeletalCoronary VasospasmMuscle, Smooth, VascularMuscle Fibers, SkeletalBrain InjuriesEsophageal Spasm, Diffuse