Muscle ContractionMuscle, SkeletalIsometric ContractionMusclesMuscle Fibers, SkeletalMuscle FatigueMuscle ProteinsElectric StimulationElectromyographyMuscle, SmoothMyosinsTroponin CTroponinCalciumRabbitsMuscle Fibers, Fast-TwitchMuscle, Smooth, VascularTorqueTropomyosinIsotonic ContractionMuscle DevelopmentMuscle Fibers, Slow-TwitchMotor NeuronsHindlimbRegional Blood FlowMuscle RelaxationMuscle DenervationMuscular AtrophyMitochondria, MuscleRecruitment, NeurophysiologicalBiomechanical PhenomenaMyocardial ContractionPhysical ExertionTime FactorsMuscle SpindlesUterine ContractionMyofibrilsPhysical EnduranceElbowMusculoskeletal Physiological PhenomenaQuadriceps MuscleSarcomeresRats, WistarTendonsAnkle JointMuscle StrengthKneePapillary MusclesPhosphocreatineLegRats, Sprague-DawleyPhysical Conditioning, AnimalCatsPsoas MusclesGlycogenVasoconstrictionHindlimb SuspensionMuscle WeaknessAdenosine TriphosphateStress, MechanicalMuscular DiseasesExerciseMyosin Heavy ChainsEnergy MetabolismAgingMyocytes, Smooth MuscleDose-Response Relationship, DrugOxygen ConsumptionGuinea PigsRana temporariaModels, BiologicalMyostatinPotassium ChlorideSatellite Cells, Skeletal MuscleReflex, StretchVolitionTracheaAction PotentialsMyocardiumElasticityMyographyMasseter MuscleAdaptation, PhysiologicalMuscle, StriatedActinsOrgan SizeThighAcetylcholineNeck MusclesKineticsAnuraAnkleReflexMuscle CellsDogsBody WeightNeural ConductionOculomotor MusclesMyosin Light ChainsPhenylephrine