Quadriceps MuscleMuscle, SkeletalExerciseElectromyographyBicyclingThighSciuridaeMuscle Fibers, SkeletalPhysical EnduranceWeight LiftingMyosin Heavy ChainsMuscle Fibers, Slow-TwitchMuscle Fibers, Fast-TwitchKneeLegCitrate (si)-SynthaseOxygen ConsumptionMuscle ContractionMuscle FatigueIsometric ContractionMitochondria, MusclePhysical ExertionBed RestGlycogenAnaerobic ThresholdMuscle ProteinsRunningHibernationResistance TrainingBiopsyKnee JointLactic AcidTorqueMuscular AtrophyExercise TestMoltingEcdysteroidsMuscle StrengthIsotonic ContractionPhysical Education and TrainingPatellaBrachyuraPulmonary Gas ExchangeMusclesAdaptation, PhysiologicalGalliformesMyostatinBivalviaPhysical FitnessSpectroscopy, Near-InfraredWeightlessness CountermeasuresBiomechanical PhenomenaPatellofemoral Pain SyndromePhosphocreatineFemoral NerveEnergy MetabolismAgingPhosphofructokinasesAconitum3-Hydroxyacyl CoA DehydrogenasesTime FactorsMuscular DiseasesWeightlessness SimulationInsulinRestBlood GlucoseMyofibrilsCarbonic Anhydrase IIILocomotionDietary CarbohydratesRecruitment, NeurophysiologicalAnalysis of VarianceRibosomal Protein S6 Kinases, 70-kDaReference ValuesSuccinate DehydrogenaseRNA, MessengerAmino Acids, EssentialHeteropteraGlucose Transporter Type 4CapillariesTendonsFatty Acids, NonesterifiedPatellar LigamentGaitHindlimbGlucose Clamp TechniqueLower ExtremityWalkingRegional Blood FlowMonocarboxylic Acid TransportersThalamusCreatine KinaseOxygenGlucoseHypertrophyImmobilizationExercise ToleranceH-ReflexWeight-BearingSurgical Flaps