Muscle FatigueFatigueMuscle, SkeletalMusclesMuscle ContractionElectromyographyIsometric ContractionMuscle Fibers, SkeletalMuscle ProteinsMuscle, SmoothTorqueNeck MusclesKneeTarsus, AnimalMuscle, Smooth, VascularQuadriceps MuscleMuscle WeaknessBackMuscle StrengthPhysical EnduranceMuscle DevelopmentBiomechanical PhenomenaLocomotionRespiratory MusclesWristFatigue Syndrome, ChronicElectric StimulationAbdominal MusclesMental FatigueMuscle SpindlesMovementHindlimbMuscle Fibers, Fast-TwitchLumbosacral RegionMuscle DenervationMotor NeuronsMuscle Fibers, Slow-TwitchElbowMuscle RelaxationExerciseTendonsReflex, StretchLegPhysical ExertionForelimbTime FactorsWeight-BearingMitochondria, MuscleSpinal CurvaturesMyocytes, Smooth MuscleCatsMuscular AtrophyIntercostal MusclesGaitRadial NerveElectric Stimulation TherapyProprioceptionHipDecerebrate StateDiaphragmOculomotor MusclesRunningReflexRecruitment, NeurophysiologicalMuscle, StriatedPostureMuscular DiseasesMuscle Strength DynamometerKnee JointExtremitiesPapillary MusclesWalkingFingersAdaptation, PhysiologicalRange of Motion, ArticularPostural BalanceReflex, MonosynapticMuscle CellsExercise TestAction PotentialsMasseter MuscleLactic AcidFacial MusclesPeroneal NerveMasticatory MusclesJointsMotor ActivityAnalysis of VarianceMotor CortexSatellite Cells, Skeletal MuscleGlycogenMuscle SpasticityExercise ToleranceExercise TherapyOxygen ConsumptionCalciumAnkleBicyclingAgingFemoral Nerve