Muscle ContractionMuscle, SkeletalTorqueIsotonic ContractionMuscle FatigueElectromyographyMuscle StrengthMusclesBiomechanical PhenomenaElectric StimulationSarcomeresHand StrengthMuscle RelaxationKneeRana temporariaMuscle Fibers, SkeletalElbowPsoas MusclesPhysical ExertionTime FactorsMyosinsMuscle Strength DynamometerPapillary MusclesExerciseMusculoskeletal Physiological PhenomenaPhysical EnduranceVolitionMyocardial ContractionRecruitment, NeurophysiologicalStress, MechanicalMyographyQuadriceps MuscleCalciumVasoconstrictionMovementMotor NeuronsRabbitsLegMuscle, SmoothElasticityAnuraKnee JointRana esculentaFingersTendonsAnkle JointMuscle, Smooth, VascularArmThighRange of Motion, ArticularPhosphocreatineVasoconstrictor AgentsMuscle TonusMuscle Fibers, Fast-TwitchVasodilationAdenosine TriphosphateHeart RateDose-Response Relationship, DrugBlood PressurePotassium ChlorideAcetylcholineElbow JointPhenylephrineMuscle WeaknessMuscle SpindlesHindlimbWeight-BearingTetanyAnalysis of VarianceKineticsModels, BiologicalAdaptation, PhysiologicalMyosin Light ChainsMuscle Fibers, Slow-TwitchAorta, ThoracicHeartVasodilator AgentsEndothelium, VascularMotor CortexTracheaReflex, StretchEvoked Potentials, MotorForearmComputer SimulationDogsAgingPhosphatesActomyosinDiaphragmNorepinephrineEnergy MetabolismRegional Blood FlowRana pipiensWristThumbArteriesHolothurinAlgorithmsNeck MusclesMuscle Stretching Exercises