Psoas MusclesPsoas AbscessMuscle ContractionMusclesIsometric ContractionMuscle Fibers, SkeletalRabbitsSarcomeresMuscle, SkeletalMyosinsMuscle, SmoothMyofibrilsMuscle ProteinsMuscle RelaxationMuscle, Smooth, VascularTroponin CMagnesium CompoundsAdenosine TriphosphatePhotolysisCalciumParaspinal MusclesMuscle DevelopmentMuscle FatigueUterine ContractionActomyosinPhosphatesAdenosine DiphosphateMyocardial ContractionBiophysical PhenomenaMuscle Fibers, Fast-TwitchMuscle Fibers, Slow-TwitchActinsBiomechanical PhenomenaTroponinX-Ray DiffractionKineticsBiophysicsRetroperitoneal SpaceActin CytoskeletonGlycerolMyosin SubfragmentsMuscle DenervationModels, BiologicalElectric StimulationMyocytes, Smooth MuscleElasticityElectromyographyIsotonic ContractionRhodaminesStress, MechanicalTime FactorsOsmolar ConcentrationMitochondria, MuscleAdenosine TriphosphatasesMuscle SpindlesPapillary MusclesNeck MusclesOculomotor MusclesTemperatureMuscle, StriatedGuinea PigsRespiratory MusclesMuscle WeaknessVasoconstrictionQuadriceps MuscleAbdominal MusclesMuscle Cells