Muscle FatigueFatigueMuscle ContractionMuscle, SkeletalVolitionElectromyographyIsometric ContractionMuscle CrampTorqueHandwritingMusclesRectus AbdominisEvoked Potentials, MotorElectric StimulationMotor CortexHandFatigue Syndrome, ChronicMental FatigueMotor NeuronsMuscle Fibers, SkeletalQuadriceps MusclePhysical EnduranceRespiratory MusclesMuscle ProteinsAbdominal MusclesMuscle, SmoothVoluntary ProgramsMuscle, Smooth, VascularExerciseBackMuscle WeaknessMuscle StrengthMuscle DevelopmentNeck MusclesPhysical ExertionMuscle RelaxationElbowDiaphragmTime FactorsIntercostal MusclesMuscle Fibers, Fast-TwitchBiomechanical PhenomenaMuscle Fibers, Slow-TwitchRunningMuscle DenervationLactic AcidMovementFemoral NerveMuscular DiseasesExercise ToleranceMitochondria, MuscleMuscle SpindlesKneeMyocytes, Smooth MuscleBicyclingElectric Stimulation TherapyOculomotor MusclesLegHand StrengthOxygen ConsumptionExercise TestAdaptation, PhysiologicalInhalationMuscle, StriatedLumbosacral RegionProprioceptionMyographyAnkle JointIsotonic ContractionLocomotionPhosphocreatineAnalysis of VariancePapillary MusclesMasticatory MusclesGlycogenWeight-BearingMotor ActivityLower ExtremityPostural BalanceSpectroscopy, Near-InfraredFacial MusclesMasseter MusclePostureCalciumTask Performance and AnalysisMuscle CellsRespirationSignal Processing, Computer-AssistedHeliumMuscular AtrophyRespiratory MechanicsUpper ExtremityMusculoskeletal SystemPsychomotor PerformanceRegional Blood FlowVoluntary Health AgenciesEnergy MetabolismSarcoplasmic ReticulumGaitOxygen