VolitionMuscle ContractionMuscle CrampMuscle, SkeletalElectromyographyHandwritingRectus AbdominisMuscle FatigueIsometric ContractionMusclesEvoked Potentials, MotorTorqueHandMotor CortexElectric StimulationMotor NeuronsMuscle ProteinsMuscle, SmoothVoluntary ProgramsMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle DevelopmentMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchMitochondria, MuscleMuscle SpindlesMyocytes, Smooth MuscleNeck MusclesOculomotor MusclesRespiratory MusclesMuscle WeaknessQuadriceps MuscleMuscle, StriatedMuscle RelaxationAbdominal MusclesPapillary MusclesMasticatory MusclesMasseter MuscleMovementFacial MusclesMuscle CellsMuscular AtrophyVoluntary Health AgenciesPhysical ExertionIntercostal MusclesTime FactorsBiomechanical PhenomenaRunningSatellite Cells, Skeletal MuscleElbowMaximal Voluntary VentilationMuscular DiseasesPectoralis MusclesPhysical Conditioning, AnimalEuthanasia, Active, VoluntaryTemporal MuscleRecruitment, NeurophysiologicalHindlimbDiaphragmPhysical EndurancePsoas MusclesExerciseLegMyofibrilsMyosin Heavy ChainsMotor ActivityReflex, StretchRabbitsHospitals, VoluntaryH-ReflexNeuromuscular JunctionCells, CulturedCalciumArmRats, Sprague-DawleyReflexGlycogenAdaptation, PhysiologicalKneePharyngeal MusclesHand StrengthWristPostureRats, WistarMuscle SpasticityRNA, MessengerThighThumbTendonsFingersAnalysis of VarianceAgingMuscular Dystrophy, AnimalMuscle RigidityAction PotentialsOxygen ConsumptionMyoblastsMice, Inbred mdxMuscle Strength Dynamometer