Psoas MusclesPsoas AbscessMusclesMuscle Fibers, SkeletalMuscle ContractionRabbitsSarcomeresIsometric ContractionMyosinsMyofibrilsMuscle, SkeletalMuscle ProteinsMagnesium CompoundsMuscle RelaxationTroponin CPhotolysisAdenosine TriphosphateParaspinal MusclesMuscle, SmoothPhosphatesMuscle, Smooth, VascularBiophysical PhenomenaAdenosine DiphosphateCalciumActomyosinMuscle Fibers, Fast-TwitchMuscle DevelopmentMuscle Fibers, Slow-TwitchTroponinX-Ray DiffractionBiophysicsRetroperitoneal SpaceKineticsGlycerolActinsBiomechanical PhenomenaMyosin SubfragmentsActin CytoskeletonElasticityRhodaminesModels, BiologicalMuscle FatigueAdenosine TriphosphatasesMuscle DenervationDiscitisOsmolar ConcentrationThighLumbosacral PlexusStress, Mechanical