Muscle ContractionMuscle, SkeletalMuscle Fibers, SkeletalIsometric ContractionMusclesTroponin CTroponinMuscle ProteinsMuscle FatigueMyosinsTropomyosinCalciumRabbitsExercise TestElectric StimulationMuscle, SmoothExerciseRegional Blood FlowExercise TherapyMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchPhysical ExertionMuscle DevelopmentMuscle, Smooth, VascularExercise ToleranceMitochondria, MuscleNerve FibersOxygen ConsumptionPhysical EnduranceMuscle RelaxationMyocardial ContractionTime FactorsMyofibrilsElectromyographyMuscle DenervationUterine ContractionSatellite Cells, Skeletal MuscleMuscular AtrophyHindlimbGlycogenMuscular DiseasesQuadriceps MuscleRats, WistarRats, Sprague-DawleyMuscle SpindlesSarcomeresMyosin Heavy ChainsDietary FiberActinsMuscle, StriatedVasoconstrictionGuinea PigsBiomechanical PhenomenaMuscle CellsMyocytes, Smooth MuscleMuscle WeaknessSarcoplasmic ReticulumDiaphragmHeart RateMyocardiumInsulinEnergy MetabolismLactic AcidTracheaIsotonic ContractionMotor NeuronsRestLegAdenosine TriphosphateKineticsRespiratory MusclesMyoblastsMyosin Light ChainsPhosphocreatineCells, CulturedModels, BiologicalNeck MusclesOculomotor MusclesRNA, MessengerGlucosePapillary MusclesDose-Response Relationship, DrugAbdominal MusclesNeuromuscular JunctionPhosphorylationPotassium ChlorideDogsAgingMuscle StrengthAdaptation, PhysiologicalPsoas MusclesAcetylcholineCaffeineSignal TransductionSarcolemmaHeartResistance TrainingMuscular Dystrophy, AnimalCatsRunning