Muscle FatigueFatigueMuscle, SkeletalMusclesMuscle ContractionCell HypoxiaIsometric ContractionMuscle ProteinsElectromyographyFatigue Syndrome, ChronicMuscle Fibers, SkeletalMyocardiumDyspneaAnoxiaMental FatigueHeartMyocytes, CardiacQuadriceps MuscleMuscle, SmoothPhysical EnduranceRespiratory MusclesAbdominal MusclesMuscle, Smooth, VascularPapillary MusclesTime FactorsMuscle DevelopmentMyocardial ContractionElectric StimulationTorqueBackExerciseCalciumMuscle RelaxationMuscle WeaknessNeck MusclesMuscle StrengthCardiac OutputDiaphragmPhysical ExertionOxygenMuscle Fibers, Fast-TwitchMyofibrilsMuscle Fibers, Slow-TwitchSarcomeresIntercostal MusclesOxygen ConsumptionHypoxia, BrainMuscular DiseasesSarcoplasmic ReticulumLactic AcidHeart VentriclesBiomechanical PhenomenaArrhythmias, CardiacElbowRabbitsMitochondria, MuscleMuscle DenervationMyocytes, Smooth MuscleExercise ToleranceCells, CulturedTroponin CRespiratory SoundsRats, WistarRats, Sprague-DawleyCardiac Surgical ProceduresExercise TestFetal HypoxiaMuscle CellsCoughTroponinCardiomegalyAdaptation, PhysiologicalDeath, Sudden, CardiacRespiratory Function TestsPulmonary Disease, Chronic ObstructiveTroponin IBicyclingPhosphocreatineHeart FailureOculomotor MusclesAction PotentialsInhalationMediastinal EmphysemaFemoral NerveRespiration DisordersRNA, MessengerRespirationElectric Stimulation TherapyCardiac MyosinsGlycogenHypoxia-Inducible Factor 1, alpha SubunitMyosin Heavy ChainsMotor NeuronsMuscle, StriatedTreatment OutcomeDogsAdenosine TriphosphateAnalysis of VarianceMuscle SpindlesSarcolemma