Muscle ContractionMuscle, SkeletalTorqueIsotonic ContractionMuscle FatigueElectromyographyMuscle StrengthMusclesBiomechanical PhenomenaElectric StimulationSarcomeresHand StrengthTime FactorsKneeMuscle RelaxationPhysical ExertionRana temporariaMuscle Fibers, SkeletalExerciseElbowPsoas MusclesPhysical EnduranceMyosinsMuscle Strength DynamometerPapillary MusclesRecruitment, NeurophysiologicalMusculoskeletal Physiological PhenomenaVolitionQuadriceps MuscleCalciumMyocardial ContractionStress, MechanicalRabbitsMovementMyographyLegMotor NeuronsVasoconstrictionAnuraMuscle, SmoothKnee JointElasticityFingersRana esculentaTendonsModels, BiologicalHeart RateAnalysis of VarianceThighPain MeasurementArmDose-Response Relationship, DrugAnkle JointPhosphocreatineRange of Motion, ArticularLightMuscle Fibers, Fast-TwitchMuscle, Smooth, VascularMagnetic Resonance ImagingBlood PressureAdenosine TriphosphateVasodilationMuscle TonusVasoconstrictor AgentsReproducibility of ResultsKineticsHindlimbOxygen ConsumptionAdaptation, PhysiologicalElbow JointEvoked Potentials, MotorMuscle WeaknessMotor CortexPotassium ChlorideAcetylcholinePhenylephrineWeight-BearingMuscle SpindlesEnergy MetabolismExercise TherapyPainTemperatureTetanyRegional Blood FlowForearmAgingRats, WistarExercise TestRats, Sprague-DawleyMyosin Light ChainsDogsCatsMuscle Fibers, Slow-TwitchHeartWristFluorescent DyesReflexEndothelium, VascularNeck MusclesVasodilator Agents