Muscle FatigueFatigueMuscle, SkeletalMusclesMuscle ContractionElectromyographyFatigue Syndrome, ChronicIsometric ContractionMental FatigueMuscle Fibers, SkeletalQuadriceps MuscleRespiratory MusclesPhysical EnduranceMuscle ProteinsMuscle, SmoothAbdominal MusclesMuscle, Smooth, VascularTorqueBackExerciseMuscle DevelopmentMuscle WeaknessElectric StimulationNeck MusclesMuscle RelaxationMuscle StrengthPhysical ExertionDiaphragmTime FactorsIntercostal MusclesMuscle Fibers, Fast-TwitchElbowMuscle Fibers, Slow-TwitchMuscle DenervationMuscular DiseasesLactic AcidExercise ToleranceBiomechanical PhenomenaMitochondria, MuscleMyocytes, Smooth MuscleOculomotor MusclesBicyclingExercise TestFemoral NerveElectric Stimulation TherapyMuscle SpindlesMotor NeuronsLumbosacral RegionInhalationOxygen ConsumptionMuscle, StriatedLegMyographyKneeRunningPapillary MusclesPhosphocreatineHand StrengthLocomotionAdaptation, PhysiologicalProprioceptionAnalysis of VarianceGlycogenDepressionIsotonic ContractionCalciumAnkle JointLower ExtremityWeight-BearingSpectroscopy, Near-InfraredMuscle CellsMusculoskeletal SystemHeliumFacial MusclesMasseter MuscleSeverity of Illness IndexQuestionnairesMasticatory MusclesSignal Processing, Computer-AssistedMovementMuscular AtrophySarcoplasmic ReticulumPostural BalanceUpper ExtremityPulmonary Disease, Chronic ObstructiveTask Performance and AnalysisQuality of LifeRespiratory MechanicsRegional Blood FlowExercise TherapyRespirationSatellite Cells, Skeletal MuscleGaitPain MeasurementTreatment OutcomeOxygenEnergy MetabolismPostureRats, WistarPectoralis Muscles