Muscle ContractionMuscle, SkeletalTorqueIsotonic ContractionMuscle FatigueElectromyographyOpen Reading FramesMuscle StrengthMusclesBiomechanical PhenomenaElectric StimulationSarcomeresHand StrengthMuscle RelaxationKneeRana temporariaMuscle Fibers, SkeletalElbowPsoas MusclesPhysical ExertionTime FactorsMuscle Strength DynamometerMyosinsPapillary MusclesExerciseMusculoskeletal Physiological PhenomenaPhysical EnduranceMyocardial ContractionCalciumVolitionRecruitment, NeurophysiologicalMyographyQuadriceps MuscleStress, MechanicalVasoconstrictionRabbitsMovementMotor NeuronsLegMuscle, SmoothRana esculentaAnuraKnee JointFractures, OpenElasticityFingersTendonsRange of Motion, ArticularAnkle JointMolecular Sequence DataModels, BiologicalAdenosine TriphosphateThighMuscle, Smooth, VascularArmPhosphocreatineMuscle TonusMuscle Fibers, Fast-TwitchElbow JointVasoconstrictor AgentsVasodilationHeart RateDose-Response Relationship, DrugAcetylcholinePotassium ChlorideBlood PressurePhenylephrineMuscle WeaknessMuscle SpindlesKineticsAmino Acid SequenceWeight-BearingHindlimbTetanyAorta, ThoracicBase SequenceAnalysis of VarianceMyosin Light ChainsMuscle Fibers, Slow-TwitchHeartTracheaEndothelium, VascularEvoked Potentials, MotorVasodilator AgentsMotor CortexForearmRana pipiensOpen BiteReflex, StretchDogsActomyosinThumbDiaphragmPhosphatesRegional Blood FlowWristNorepinephrineAdaptation, PhysiologicalRats, WistarArteries