Quadriceps MuscleThighMuscle, SkeletalMusclesMuscle StrengthMuscle FatigueMuscle WeaknessMuscle ContractionTorqueIsometric ContractionKneeKnee JointFemoral NerveMuscle ProteinsMuscle Strength DynamometerMuscle Fibers, SkeletalElectromyographyElectric Stimulation TherapyPatellaExerciseMuscle, SmoothLegMuscular AtrophyAnterior Cruciate LigamentBiomechanical PhenomenaKnee InjuriesMuscular DiseasesPatellar LigamentMuscle, Smooth, VascularRespiratory MusclesMuscle Fibers, Slow-TwitchJoggingMuscle DevelopmentArtificial OrgansMitochondria, MuscleTendonsImmobilizationPhysical EnduranceElectric StimulationOsteoarthritis, KneePatellofemoral JointOxygen ConsumptionRange of Motion, ArticularMyostatinWeight LiftingJoint InstabilityBicyclingMuscle Fibers, Fast-TwitchPhysical ExertionWeight-BearingExercise TestGaitPatellofemoral Pain SyndromeArthroplasty, Replacement, KneeMuscle DenervationExercise TherapyRecovery of FunctionPulmonary Disease, Chronic ObstructiveTime FactorsMotor NeuronsAbdominal MusclesMyocytes, Smooth MuscleMuscle SpindlesLactic AcidAdaptation, PhysiologicalParaplegiaBiopsyMuscle RelaxationHypertrophyNeck MusclesOculomotor MusclesGlycogenRegional Blood FlowMuscle, StriatedAnalysis of VarianceOrgan SizeFemurPapillary MusclesPain MeasurementMotor ActivityPainAgingMuscle CellsMasseter MuscleFacial MusclesMasticatory MusclesPhysical Conditioning, HumanIntercostal MusclesHindlimbOxygenMusculoskeletal Physiological PhenomenaDiaphragmH-ReflexMagnetic Resonance ImagingRuptureTreatment OutcomeSatellite Cells, Skeletal MuscleMyofibrilsLactatesMyosin Heavy Chains