Muscle ContractionMuscle, SkeletalTorqueIsotonic ContractionMuscle FatigueElectromyographyMuscle StrengthMusclesBiomechanical PhenomenaElectric StimulationSarcomeresTime FactorsHand StrengthKneeMuscle RelaxationRana temporariaMuscle Fibers, SkeletalElbowPsoas MusclesPhysical ExertionMuscle Strength DynamometerExerciseMyosinsPapillary MusclesModels, BiologicalMusculoskeletal Physiological PhenomenaMovementStress, MechanicalCalciumPhysical EnduranceVolitionMyocardial ContractionRabbitsRecruitment, NeurophysiologicalQuadriceps MuscleMyographyMotor NeuronsVasoconstrictionLegMuscle, SmoothKnee JointAnuraDose-Response Relationship, DrugElasticityFingersHistory, 20th CenturyRana esculentaTendonsRange of Motion, ArticularKineticsCost-Benefit AnalysisArmAnkle JointAnalysis of VarianceAdenosine TriphosphateThighModels, MolecularMuscle, Smooth, VascularHeart RateBlood PressureVasodilationPhosphocreatineMuscle TonusMolecular Sequence DataVasoconstrictor AgentsMuscle Fibers, Fast-TwitchTreatment OutcomeWeight-BearingElbow JointAgingPotassium ChlorideAcetylcholineHistory, 21st CenturyAdaptation, PhysiologicalHindlimbMuscle WeaknessQualitative ResearchPhenylephrineDogsMuscle SpindlesFocus GroupsUnited StatesHistory, 19th CenturyHeartAttitude of Health PersonnelTetanyMotor CortexAmino Acid SequenceRats, WistarEndothelium, VascularProtein ConformationVasodilator AgentsRats, Sprague-DawleyPostureEnergy MetabolismMyosin Light ChainsNeck MusclesQuestionnairesTracheaComputer Simulation