Muscle ContractionMuscle, SkeletalIsometric ContractionMusclesMuscle Fibers, SkeletalMuscle FatigueRana temporariaMuscle ProteinsRana pipiensAnuraCalciumElectric StimulationMyosinsMuscle, SmoothRanidaeTroponin CTroponinElectromyographyRabbitsRana esculentaTropomyosinMyofibrilsSarcomeresMuscle, Smooth, VascularMuscle RelaxationRana catesbeianaMuscle DevelopmentIsotonic ContractionTorqueMuscle Fibers, Fast-TwitchTime FactorsRegional Blood FlowMyocardial ContractionMuscle Fibers, Slow-TwitchMitochondria, MuscleTetracaineSarcoplasmic ReticulumUterine ContractionMotor NeuronsQuadriceps MuscleElbowBiomechanical PhenomenaRecruitment, NeurophysiologicalMembrane PotentialsCaffeinePapillary MusclesMuscle DenervationPhysical ExertionPhysical EnduranceMuscle SpindlesMuscle StrengthPsoas MusclesKineticsHindlimbSatellite Cells, Skeletal MuscleKneeModels, BiologicalAdenosine TriphosphateMuscular AtrophyAction PotentialsPotassiumVasoconstrictionNaphthalenesulfonatesRats, WistarActinsMuscle WeaknessMuscular DiseasesPhosphocreatineExerciseElectrophysiologyRats, Sprague-DawleyStress, MechanicalDose-Response Relationship, DrugMusculoskeletal Physiological PhenomenaGuinea PigsSarcolemmaEnergy MetabolismMyocytes, Smooth MuscleMuscle CellsLegPotassium ChlorideMyocardiumArsenazo IIIGlycogenMuscle, StriatedVolitionMasseter MuscleTracheaRyanodine Receptor Calcium Release ChannelAcetylcholineMyosin Heavy ChainsHypertonic SolutionsThighElectric ConductivityMyoblastsNeck MusclesDantroleneOxygen ConsumptionIon ChannelsMyography