Muscle, SkeletalMuscle ContractionMuscle Fibers, SkeletalMusclesMuscle ProteinsIsometric ContractionMuscle FatigueTroponin CTroponinMuscle, SmoothMyosinsRabbitsCalciumTropomyosinElectric StimulationMuscle DevelopmentMitochondria, MuscleMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMuscle, Smooth, VascularRegional Blood FlowExerciseSatellite Cells, Skeletal MuscleGlycogenMuscular AtrophyMuscle DenervationMuscular DiseasesQuadriceps MuscleMyofibrilsMuscle CellsMuscle RelaxationPhysical ExertionInsulinTime FactorsMyosin Heavy ChainsPhysical EnduranceElectromyographyMyoblastsPhosphocreatineHindlimbRNA, MessengerOxygen ConsumptionGlucoseLegMyocytes, Smooth MuscleMuscle, StriatedCells, CulturedMuscle SpindlesMyoblasts, SkeletalCitrate (si)-SynthaseSarcoplasmic ReticulumMuscle WeaknessRats, WistarAdenosine TriphosphateSarcolemmaRats, Sprague-DawleyLactic AcidMyocardial ContractionPhosphorylationOculomotor MusclesMyostatinGlucose Transporter Type 4MyocardiumKineticsNeck MusclesSignal TransductionActinsSarcomeresEnergy MetabolismGene Expression RegulationMyoD ProteinPapillary MusclesUterine ContractionRespiratory MusclesMolecular Sequence DataDiaphragmCreatine KinaseAMP-Activated Protein KinasesModels, BiologicalAbdominal MusclesRegenerationAgingAdaptation, PhysiologicalMotor NeuronsMuscular Dystrophy, AnimalMice, Inbred C57BLThighBiomechanical PhenomenaVasoconstrictionPhysical Conditioning, AnimalPsoas MusclesRyanodine Receptor Calcium Release ChannelBiopsyNeuromuscular JunctionMice, Inbred mdxGuinea PigsInsulin ResistanceDystrophinCaffeineDose-Response Relationship, Drug