Whole Body ImagingLeukocyte CountPlatelet CountCD4 Lymphocyte CountPlethysmography, Whole BodyWhole-Body CountingCell CountBlood Cell CountMuscle, SkeletalVibrationBody CompositionWhole-Body IrradiationColony Count, MicrobialLymphocyte CountErythrocyte CountEnergy MetabolismLeucineSperm CountHeat Stress DisordersTime FactorsGlucoseBody WeightAbsorptiometry, PhotonInsulinHyperthermia, InducedAdipose TissueOxygen ConsumptionLiverExerciseBody TemperatureBody Temperature RegulationBlood GlucoseRadiation DosagePhysical EnduranceGlucose Clamp TechniqueTissue DistributionFatty Acids, NonesterifiedInsulin ResistanceRegional Blood FlowPotassium RadioisotopesHIV InfectionsCalorimetry, IndirectRadiometryBone DensityProteinsLegSkinLipid MetabolismRadiation Injuries, ExperimentalGlycogenPhenylalanineParasite Egg CountKineticsReference ValuesOxidation-ReductionRadiopharmaceuticalsRadiation-Protective AgentsNitrogenModels, BiologicalPositron-Emission TomographyReticulocyte CountSensitivity and SpecificityDietSplanchnic CirculationMuscle ProteinsMetabolic Clearance RateBody Fluid CompartmentsIodine RadioisotopesOrgan SizeFastingAnalysis of VarianceBody BurdenMice, Inbred C57BLSweatWeight LiftingTreatment OutcomeBed RestRats, Sprague-DawleyDose-Response Relationship, RadiationHomeostasisBody WaterHormonesReproducibility of ResultsGamma RaysProspective StudiesPhysical ExertionRadioisotope Dilution TechniqueHematocritMagnetic Resonance ImagingLipolysisNitrogen IsotopesHuman BodySweatingRheniumObesityAgingBiological MarkersHot TemperatureFluorodeoxyglucose F18Viscera