Muscle ContractionMuscle, SkeletalIsometric ContractionMuscle FatigueElectromyographyMusclesVolitionTorqueMuscle Fibers, SkeletalElectric StimulationMuscle ProteinsHand StrengthMotor NeuronsElbowPhysical EndurancePhysical ExertionKneeRecruitment, NeurophysiologicalMuscle, SmoothTroponin CQuadriceps MuscleMuscle StrengthExerciseTroponinEvoked Potentials, MotorRegional Blood FlowH-ReflexMyosinsForearmCalciumLegRabbitsMuscle Fibers, Fast-TwitchTropomyosinReflexFingersTime FactorsAnkle JointMaximal Voluntary VentilationBiomechanical PhenomenaElbow JointMuscle, Smooth, VascularPeroneal NerveMuscle DevelopmentMuscle Fibers, Slow-TwitchMuscle SpindlesTendonsMuscle DenervationAdaptation, PhysiologicalReflex, StretchHandThumbMitochondria, MuscleFemoral NerveMuscular AtrophyMotor CortexHindlimbTibial NerveHeart RatePhosphocreatineAnkleVibrationTranscranial Magnetic StimulationPyramidal TractsMuscle RelaxationArmMovementIsotonic ContractionBlood PressurePhysical Conditioning, AnimalSympathetic Nervous SystemOxygen ConsumptionAction PotentialsIschemiaMuscle WeaknessNeuromuscular JunctionUterine ContractionStress, MechanicalMyocardial ContractionFootAnalysis of VarianceRats, WistarRunningRats, Sprague-DawleyErgometryMyofibrilsResistance TrainingGlycogenAgingPostureAbdominal MusclesBicyclingRespiratory MusclesHindlimb SuspensionAchilles TendonNeck MusclesKnee JointCatsMuscular DiseasesRest