Muscle ContractionMuscle, SkeletalMuscle Fibers, SkeletalMusclesIsometric ContractionTroponin CTroponinMuscle ProteinsMyosinsMuscle FatigueTropomyosinElectric StimulationRabbitsCalciumMuscle, SmoothRegional Blood FlowMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchMuscle DevelopmentMuscle, Smooth, VascularNerve FibersMuscle DenervationMitochondria, MuscleMuscle RelaxationMyofibrilsElectromyographyMyocardial ContractionUterine ContractionHindlimbSatellite Cells, Skeletal MuscleMuscular AtrophyMuscle SpindlesMotor NeuronsTime FactorsRats, Sprague-DawleyRats, WistarMuscular DiseasesGuinea PigsSarcomeresNeuromuscular JunctionMyosin Heavy ChainsOculomotor MusclesActinsDietary FiberGlycogenMyocytes, Smooth MuscleMuscle, StriatedQuadriceps MuscleTracheaDiaphragmMuscle CellsVasoconstrictionSarcoplasmic ReticulumBiomechanical PhenomenaAcetylcholineMyocardiumPhysical ExertionCells, CulturedNeck MusclesMuscle WeaknessCatsMyoblastsMyosin Light ChainsAdenosine TriphosphateRNA, MessengerKineticsIsotonic ContractionModels, BiologicalDose-Response Relationship, DrugPapillary MusclesSympathetic Nervous SystemPotassium ChlorideDogsInsulinNorepinephrineDenervationSignal TransductionPsoas MusclesMembrane PotentialsAbdominal MusclesPhosphorylationMice, Inbred C57BLExerciseNeurons, AfferentHeartAction PotentialsCaffeineAgingRespiratory MusclesAxonsSarcolemmaGlucoseMuscular Dystrophy, AnimalAdrenergic FibersMuscle TonusImmunohistochemistryPeristalsisFacial MusclesActomyosinMyoblasts, Skeletal