FatigueMuscle ContractionMuscle FatigueFatigue Syndrome, ChronicMental FatigueIsometric ContractionMuscle, SkeletalMyocardial ContractionUterine ContractionIsotonic ContractionElectromyographyTorqueElectric StimulationMuscle, SmoothMusclesMuscle RelaxationMuscle StrengthCalciumVasoconstrictionBiomechanical PhenomenaTime FactorsMuscle Fibers, SkeletalKneeMuscle, Smooth, VascularGuinea PigsPhysical EnduranceElbowPhysical ExertionSarcomeresPotassium ChlorideHand StrengthDose-Response Relationship, DrugRabbitsMotor NeuronsExerciseMyosinsVolitionVasoconstrictor AgentsStress, MechanicalMyographyTracheaAcetylcholineRecruitment, NeurophysiologicalRana temporariaMuscle TonusNorepinephrineQuadriceps MusclePhenylephrinePapillary MusclesMyosin Light ChainsDiaphragmAorta, ThoracicGastrointestinal MotilityRats, WistarDogsMuscle Strength DynamometerPsoas MusclesAdenosine TriphosphateMovementPhosphocreatine15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidCaffeineUrinary BladderAtropineLegRats, Sprague-DawleyMuscle Fibers, Fast-TwitchNifedipinePeristalsisCarbacholAnuraMusculoskeletal Physiological PhenomenaAnalysis of VarianceHeart RatePotassiumElasticityFingersMuscle SpindlesMuscle Fibers, Slow-TwitchSerotoninArteriesTendonsVasodilationHeartReflexAction PotentialsActomyosinCatsIleumVas DeferensModels, Biologicalrho-Associated KinasesBlood PressureThighCalcium Channel BlockersPressureHindlimbIndomethacinVasodilator AgentsMyometrium