Muscle Fibers, SkeletalMusclesMuscle, SkeletalMuscle Fibers, Slow-TwitchMuscle Fibers, Fast-TwitchMuscle ContractionMuscle ProteinsMuscle DenervationMuscle DevelopmentMuscle, SmoothHindlimb SuspensionMuscular AtrophyMuscle FatigueMuscle, Smooth, VascularMyosin Heavy ChainsIsometric ContractionMitochondria, MuscleMuscle SpindlesMyofibrilsHindlimbElectromyographyElectric StimulationNerve FibersRats, WistarMotor NeuronsOculomotor MusclesNeuromuscular JunctionH-ReflexMuscle RelaxationSarcomeresMuscle WeaknessMuscular DiseasesMuscle, StriatedMyocytes, Smooth MuscleGlycogenTime FactorsPsoas MusclesNeck MusclesRana temporariaCalciumSatellite Cells, Skeletal MuscleImmobilizationDiaphragmRespiratory MusclesQuadriceps MuscleMuscular Dystrophy, AnimalBiomechanical PhenomenaPapillary MusclesCatsMasseter MuscleRats, Sprague-DawleyRabbitsAbdominal MusclesMuscle CellsRegenerationMasticatory MusclesClenbuterolMotor EndplateReflex, StretchIntercostal MusclesFacial MusclesOrgan SizeHistocytochemistryMice, Inbred mdxDietary FiberMyosinsTendonsSarcolemmaMembrane PotentialsSkeletal Muscle MyosinsRats, Inbred StrainsPhysical Conditioning, AnimalAction PotentialsPectoralis MusclesRana pipiensIsotonic ContractionSarcoplasmic ReticulumRNA, MessengerAgingInsulinBody WeightPhysical ExertionAnuraProtein IsoformsLegHypertrophyMicroscopy, ElectronGlucoseThoracicaTarsus, AnimalNeural ConductionMyostatinStress, MechanicalDystrophinCells, CulturedAdaptation, PhysiologicalCaffeineCitrate (si)-SynthaseMyoD ProteinReceptors, Cholinergic