Isometric ContractionMuscle, SkeletalMuscle ContractionMusclesElbowMuscle StrengthElectromyographyKnee JointBiomechanical PhenomenaExercise TherapyMuscle, SmoothMuscle Fibers, SkeletalMuscle FatigueMuscle ProteinsRange of Motion, ArticularTime FactorsMuscle, Smooth, VascularTorqueIsotonic ContractionMuscle DevelopmentMuscle RelaxationMuscle Fibers, Fast-TwitchPapillary MusclesMuscle Fibers, Slow-TwitchElectric StimulationMuscle DenervationQuadriceps MuscleSarcomeresPsoas MusclesMuscle SpindlesNeck MusclesMuscle WeaknessMyocytes, Smooth MuscleRana temporariaHand StrengthMitochondria, MuscleKneePhysical ExertionMuscle, StriatedCalciumRabbitsMuscle Strength DynamometerExerciseOculomotor MusclesMotor NeuronsAbdominal MusclesPhysical EnduranceMuscular AtrophyRespiratory MusclesMasseter MuscleLegMasticatory MusclesHindlimbStress, MechanicalMusculoskeletal Physiological PhenomenaMuscle CellsRecruitment, NeurophysiologicalMyocardial ContractionMovementAnuraTendonsVasoconstrictionMyosinsVolitionMyographyDiaphragmThighMyosin Heavy ChainsPhosphocreatineElasticityFacial MusclesIntercostal MusclesMuscular DiseasesRana esculentaAdenosine TriphosphateModels, BiologicalArmFingersRats, WistarAcetylcholineMuscle Stretching ExercisesAnkle JointSatellite Cells, Skeletal MuscleRats, Sprague-DawleyDose-Response Relationship, DrugTracheaActinsPotassium ChloridePectoralis MusclesVasodilationReflex, StretchAgingVasoconstrictor AgentsKineticsCatsWeight-BearingHeart RateBlood PressureRegional Blood FlowHeart