Muscle, SkeletalMuscle ContractionMuscle Fibers, SkeletalMusclesMuscle ProteinsIsometric ContractionMuscle FatigueTroponin CTroponinMuscle, SmoothMyosinsRabbitsCalciumTropomyosinElectric StimulationMuscle DevelopmentMitochondria, MuscleMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMuscle, Smooth, VascularRegional Blood FlowStress, MechanicalExerciseSatellite Cells, Skeletal MuscleGlycogenMuscular AtrophyMuscular DiseasesMuscle DenervationQuadriceps MuscleMyofibrilsMuscle CellsMuscle RelaxationPhysical ExertionInsulinTime FactorsMyosin Heavy ChainsElectromyographyPhysical EnduranceMyoblastsPhosphocreatineHindlimbRNA, MessengerOxygen ConsumptionBiomechanical PhenomenaGlucoseLegMyocytes, Smooth MuscleCells, CulturedMuscle, StriatedMuscle SpindlesMyoblasts, SkeletalRats, Sprague-DawleyRats, WistarMuscle WeaknessCitrate (si)-SynthaseMyocardial ContractionAdenosine TriphosphateSarcoplasmic ReticulumSarcolemmaActinsMyocardiumLactic AcidPhosphorylationSignal TransductionOculomotor MusclesMyostatinKineticsGlucose Transporter Type 4SarcomeresNeck MusclesEnergy MetabolismGene Expression RegulationPapillary MusclesModels, BiologicalRespiratory MusclesMyoD ProteinDiaphragmUterine ContractionCreatine KinaseAMP-Activated Protein KinasesRegenerationAbdominal MusclesAdaptation, PhysiologicalMolecular Sequence DataAgingMuscular Dystrophy, AnimalMice, Inbred C57BLMotor NeuronsThighPhysical Conditioning, AnimalPsoas MusclesVasoconstrictionMice, Inbred mdxGuinea PigsDystrophinRyanodine Receptor Calcium Release ChannelBiopsyHypertrophyInsulin ResistanceDose-Response Relationship, Drug