Muscle FatigueFatigueMuscle Fibers, SkeletalMusclesMuscle, SkeletalMuscle ContractionMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMuscle ProteinsMuscle, SmoothIsometric ContractionElectromyographyMuscle DevelopmentMuscle, Smooth, VascularQuadriceps MuscleRespiratory MusclesMuscle DenervationFatigue Syndrome, ChronicAbdominal MusclesMental FatiguePhysical EnduranceMuscle RelaxationElectric StimulationMuscle WeaknessNeck MusclesMitochondria, MuscleDiaphragmMyofibrilsNerve FibersMuscular DiseasesOculomotor MusclesMuscle SpindlesIntercostal MusclesExerciseTorqueTime FactorsMuscle, StriatedMyocytes, Smooth MuscleBackRana temporariaMyosin Heavy ChainsPsoas MusclesCalciumMotor NeuronsBiomechanical PhenomenaPhysical ExertionMuscular AtrophyMuscle StrengthPapillary MusclesMasseter MuscleNeuromuscular JunctionSarcomeresSatellite Cells, Skeletal MuscleMuscle CellsMasticatory MusclesFacial MusclesRabbitsSarcoplasmic ReticulumHindlimbDietary FiberElbowLactic AcidGlycogenRana pipiensMuscular Dystrophy, AnimalPectoralis MusclesIsotonic ContractionOxygen ConsumptionAction PotentialsAnuraMice, Inbred mdxLegRats, WistarExercise ToleranceThoracicaRunningMembrane PotentialsPhosphocreatineAdaptation, PhysiologicalBicyclingModels, BiologicalLocomotionLumbosacral RegionExercise TestCells, CulturedElectric Stimulation TherapyAdenosine TriphosphateAgingSarcolemmaMyoblastsTemporal MuscleRegenerationHistocytochemistryMotor EndplateDystrophinMyographyFemoral NerveInhalationKneeMineral Fibers