Muscle StrengthResistance TrainingIsometric ContractionExercise TherapyMusculoskeletal Physiological PhenomenaMuscle, SkeletalExerciseMuscle ContractionPhysical Education and TrainingRange of Motion, ArticularExercise TestLegKnee JointExercise TolerancePhysical ExertionTorqueMuscle FatigueHand StrengthIsotonic ContractionPhysical EnduranceElectromyographyTensile StrengthOxygen ConsumptionMusclesBiomechanical PhenomenaMuscle Strength DynamometerTime FactorsKneeHeart RateElectric StimulationQuadriceps MuscleShear StrengthMuscle Fibers, SkeletalSarcomeresMuscle RelaxationElbowMuscle Stretching ExercisesPhysical FitnessRestRana temporariaStress, MechanicalBicyclingBlood PressureWeight LiftingPsoas MusclesAnalysis of VarianceRunningMyosinsCompressive StrengthVolitionMyocardial ContractionMuscle WeaknessAdaptation, PhysiologicalThighPapillary MusclesRegional Blood FlowRecruitment, NeurophysiologicalPhosphocreatineMovementVasoconstrictionArmElasticityCalciumEnergy MetabolismLactic AcidMotor NeuronsOsmolar ConcentrationMyographyAgingAnaerobic ThresholdTendonsWeight-BearingRabbitsForearmVasodilationHeartPulmonary Gas ExchangeMuscle Fibers, Fast-TwitchFingersAnkle JointMuscle, SmoothMaterials TestingAnuraBreathing ExercisesModels, BiologicalRana esculentaWalkingMotor ActivityDental BondingHemodynamicsAdenosine TriphosphateHindlimbDental Stress AnalysisOxygenErgometryCardiac OutputKineticsGlycogenMuscle TonusNorepinephrine