BackElasticityIntermediate Back MusclesBack MusclesLumbosacral RegionSuperficial Back MusclesLow Back PainMuscle, SkeletalElasticity Imaging TechniquesMuscle FatigueMusclesElectromyographyAbdominal MusclesPostureMuscle ProteinsMuscle, SmoothSpineProprioceptionBack PainPostural BalanceMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle ContractionMuscle DevelopmentMuscle StrengthLumbar VertebraeElastic ModulusMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchBiomechanical PhenomenaMyocytes, Smooth MuscleMitochondria, MuscleStress, MechanicalViscosityNeck MusclesOculomotor MusclesMuscle RelaxationMuscle, StriatedMuscle SpindlesMuscle WeaknessRespiratory MusclesConnectinPapillary MusclesMicroscopy, Atomic ForceQuadriceps MuscleBack InjuriesMuscle CellsIsometric ContractionModels, BiologicalMasseter MusclePectoralis MusclesFacial MusclesMasticatory MusclesSatellite Cells, Skeletal MuscleIntercostal MusclesTensile StrengthMuscular AtrophyTime FactorsPsoas MusclesRheologyArteriesRabbitsMuscular DiseasesHardness TestsMyofibrilsCells, CulturedElastic TissueSarcomeresActinsCalciumElastinCompressive StrengthUltrasonography, MammaryHindlimbTemporal MuscleFinite Element AnalysisComplianceElectric StimulationTendonsAortaPressureElastomersMyosin Heavy ChainsTaxesHardnessBiophysicsRats, Sprague-DawleyKineticsAgingPharyngeal MusclesMicroscopy, Scanning ProbeDiaphragmComputer SimulationMotor NeuronsRats, WistarGlycogenNeuromuscular JunctionVascular StiffnessMovement