Muscle, SkeletalMuscle ContractionMuscle Fibers, SkeletalMusclesMuscle ProteinsIsometric ContractionTroponin CTroponinMuscle FatigueMuscle, SmoothMyosinsRabbitsTropomyosinCalciumElectric StimulationMuscle DevelopmentMuscle, Smooth, VascularMuscle Fibers, Fast-TwitchMitochondria, MuscleRegional Blood FlowMuscle Fibers, Slow-TwitchMuscle DenervationSatellite Cells, Skeletal MuscleMuscular AtrophyMuscle RelaxationMyofibrilsMuscular DiseasesHindlimbElectromyographyMuscle CellsTime FactorsQuadriceps MuscleMyocytes, Smooth MuscleMuscle, StriatedGlycogenMuscle SpindlesMyoblastsMuscle WeaknessRats, Sprague-DawleyMyosin Heavy ChainsRats, WistarMyocardial ContractionOculomotor MusclesSarcoplasmic ReticulumNeck MusclesSarcomeresInsulinPhysical ExertionPapillary MusclesUterine ContractionRespiratory MusclesMyoblasts, SkeletalCells, CulturedRNA, MessengerMyocardiumActinsDiaphragmExerciseKineticsAbdominal MusclesGlucoseMyoD ProteinMyostatinMuscular Dystrophy, AnimalAdenosine TriphosphateSarcolemmaBiomechanical PhenomenaRegenerationMolecular Sequence DataPhysical Conditioning, AnimalPsoas MusclesMotor NeuronsSignal TransductionRyanodine Receptor Calcium Release ChannelOxygen ConsumptionNeuromuscular JunctionMice, Inbred C57BLPhosphorylationModels, BiologicalMice, Inbred mdxGuinea PigsPhysical EnduranceGlucose Transporter Type 4Facial MusclesMasseter MuscleMasticatory MusclesEnergy MetabolismPhosphocreatineTracheaVasoconstrictionCaffeineDose-Response Relationship, DrugAgingGene Expression RegulationDystrophinMembrane PotentialsCreatine KinaseIntercostal MusclesSkeletal Muscle MyosinsAnura