Muscle ContractionIsometric ContractionExercisePhysical ExertionMuscle, SkeletalExercise TestMusclesMovementExercise TherapyHeart RateMuscle FatigueMuscle, SmoothBlood PressureLaser-Doppler FlowmetryHand StrengthChoroidRegional Blood FlowElectromyographyExercise ToleranceOxygen ConsumptionMuscle ProteinsMuscle Fibers, SkeletalElectric StimulationMuscle, Smooth, VascularTime FactorsPhysical EnduranceIntraocular PressureLegReflexTonometry, OcularBlood Flow VelocityCardiac OutputMuscle RelaxationPhysical Conditioning, AnimalMyocardial ContractionCalciumSympathetic Nervous SystemRunningTorqueBiomechanical PhenomenaUterine ContractionIsotonic ContractionMuscle DevelopmentMuscle Fibers, Fast-TwitchHeartResistance TrainingPhysical FitnessBicyclingAdaptation, PhysiologicalCross-Over StudiesEye MovementsLactic AcidHemodynamicsMuscle Fibers, Slow-TwitchRabbitsPulmonary Gas ExchangeMuscle SpindlesFovea CentralisEnergy MetabolismAnalysis of VarianceQuadriceps MuscleVasoconstrictionVascular ResistanceMyosinsPapillary MusclesCardiovascular Physiological PhenomenaMuscle StrengthCold TemperatureMotor NeuronsMotor ActivityTracheaSarcomeresPeptides, CyclicNeck MusclesGuinea PigsMyocytes, Smooth MuscleMitochondria, MuscleReceptor, Endothelin AMuscle DenervationHindlimbAgingRespirationMuscle WeaknessKineticsSportsPhysical Therapy ModalitiesMuscle, StriatedRats, Sprague-DawleyPotassium ChlorideModels, BiologicalRats, WistarRestAcetylcholineMyosin Light ChainsActinsRespiratory MusclesOculomotor MusclesAbdominal MusclesDouble-Blind MethodDose-Response Relationship, Drug