Muscle StrengthMotor NeuronsMotor Neuron DiseaseNeuronsMuscle Strength DynamometerMusclesMuscle, SkeletalRespiratory MusclesMuscle WeaknessSurvival of Motor Neuron 1 ProteinNeurons, AfferentMuscle ContractionHand StrengthCell SurvivalMotor CortexMuscle ProteinsIsometric ContractionSurvival of Motor Neuron 2 ProteinEvoked Potentials, MotorSurvival RateMuscle Fibers, SkeletalMuscle, SmoothMotor ActivityAmyotrophic Lateral SclerosisSpinal CordNeuromuscular DiseasesElectromyographyQuadriceps MuscleTime FactorsMuscle, Smooth, VascularMuscular Atrophy, SpinalMuscle DevelopmentResistance TrainingMuscle FatigueTensile StrengthAxonsElectric StimulationAction PotentialsTorqueKneeSMN Complex ProteinsCells, CulturedMovementNerve Tissue ProteinsExercise TherapyMuscle DenervationAbdominal MusclesWeight LiftingBiomechanical PhenomenaNeck MusclesPhysical EnduranceMuscle Fibers, Fast-TwitchMuscular AtrophyNeuromuscular JunctionDisease-Free SurvivalImmunohistochemistryMice, TransgenicAnalysis of VarianceSynapsesBreathing ExercisesElectrophysiologyAgingTreatment OutcomeMuscle Fibers, Slow-TwitchLegMuscle, StriatedSurvivalSarcopeniaDisease Models, AnimalMolecular Motor ProteinsInspiratory CapacityNerve DegenerationPhysical FitnessOculomotor MusclesMice, Inbred C57BLMaximal Voluntary VentilationSynaptic TransmissionRange of Motion, ArticularGanglia, InvertebrateExerciseKnee JointWalkingMuscle SpindlesThighInhalationPostural BalanceSurvival AnalysisShear StrengthInterneuronsSignal TransductionMuscular DiseasesMitochondria, MuscleMyocytes, Smooth MuscleMutationMembrane PotentialsMuscle RelaxationRats, Sprague-DawleyNeural ConductionSuperoxide DismutaseAnimals, Newborn