Muscle, SkeletalMuscle ContractionMuscle FatigueMuscle Fibers, SkeletalMusclesIsometric ContractionMuscle ProteinsMuscle, SmoothTroponin CTroponinMyosinsElectric StimulationCalciumRabbitsTropomyosinMuscle DevelopmentMuscle, Smooth, VascularMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchBiomechanical PhenomenaElectromyographyRegional Blood FlowMitochondria, MuscleMuscle RelaxationMyocardial ContractionUterine ContractionMuscle DenervationMuscular AtrophySatellite Cells, Skeletal MuscleQuadriceps MuscleMuscle WeaknessMyofibrilsMuscle StrengthHindlimbTorqueTime FactorsMuscular DiseasesOculomotor MusclesMuscle SpindlesModels, BiologicalDiaphragmNeck MusclesMotor NeuronsMuscle CellsRats, Sprague-DawleyMyocytes, Smooth MusclePsoas MusclesPhysical ExertionRats, WistarGlycogenTendonsMuscle, StriatedSarcomeresRespiratory MusclesMuscular Dystrophy, AnimalAbdominal MusclesSarcoplasmic ReticulumStress, MechanicalMyoblastsMyosin Heavy ChainsGuinea PigsPapillary MusclesMasticatory MusclesVasoconstrictionActinsThighMyocardiumExerciseRecruitment, NeurophysiologicalCells, CulturedBite ForceMice, Inbred mdxLegPhysical EnduranceInsulinAdenosine TriphosphateWeight-BearingKineticsRNA, MessengerTracheaMyoblasts, SkeletalIsotonic ContractionOxygen ConsumptionDystrophinDose-Response Relationship, DrugPotassium ChlorideGlucoseEnergy MetabolismSarcolemmaPhosphorylationCaffeineSignal TransductionDogsMice, Inbred C57BLMyostatinMyoD ProteinAgingNeuromuscular JunctionPhysical Conditioning, AnimalAcetylcholine