HolothuriaHousing, AnimalEnvironment, ControlledSurgical EquipmentAnimals, ZooPostural BalanceAquacultureExplosive AgentsVentilationOperating RoomsSpace FlightSpatial BehaviorCaenorhabditis elegansBehavior, AnimalSexual Behavior, AnimalBody SizeDairyingSpace PerceptionCaenorhabditis elegans ProteinsOrientationSeasonsAnimal HusbandryReproductionGoatsSunlightEnvironmentSocial BehaviorLarvaGeologic SedimentsBody WeightEcosystemMotor ActivityWater-Electrolyte BalanceTime FactorsSpecies SpecificitySensation DisordersEnergy MetabolismNitrogenAccidental FallsAcid-Base EquilibriumGaitVestibular DiseasesTh1-Th2 BalancePostureDietary ProteinsVestibular Function TestsEatingEnergy IntakeModels, BiologicalHomeostasisNutritional RequirementsDietGait Disorders, NeurologicProprioceptionSignal TransductionFecesWalkingSodiumPhosphorusExercise TherapyBiomechanical PhenomenaAnalysis of VarianceMice, Inbred C57BLBody Temperature RegulationVestibule, LabyrinthHypothalamusAgingLeptinVideo GamesOxidation-ReductionGeriatric AssessmentAnimal FeedAdaptation, PhysiologicalMuscle StrengthDizzinessMice, KnockoutCanesMineralsBody CompositionAgouti-Related ProteinAnimal Nutritional Physiological PhenomenaAbsorptionDigestionCalorimetry, IndirectObesityCells, CulturedMuscle, SkeletalAmino AcidsPhysical Therapy ModalitiesElectrolytesExerciseFeeding BehaviorIntestinal AbsorptionBasal MetabolismKidneyMovementRNA, MessengerParenteral Nutrition, TotalPro-OpiomelanocortinWeight Gain