Body CompositionBody Mass IndexBody WeightObesityMuscle, SkeletalMusclesRisk FactorsMass SpectrometryMuscle ProteinsAnthropometrySarcopeniaOverweightMuscular AtrophyThinnessMuscle Fibers, SkeletalCross-Sectional StudiesAdipose TissueAbsorptiometry, PhotonMyostatinMuscle, SmoothBody HeightMuscle DevelopmentProspective StudiesExerciseCohort StudiesMuscle ContractionBody WaterAge FactorsSex FactorsRegression AnalysisWeight LossTime FactorsMuscle, Smooth, VascularBody ConstitutionBlood GlucoseWaist CircumferenceOrgan SizeLinear ModelsAgingWaist-Hip RatioCase-Control StudiesBlood PressureAdiposityWeight GainMuscle StrengthSkinfold ThicknessPrevalenceInsulin ResistanceFollow-Up StudiesNutritional StatusLongitudinal StudiesWhole-Body IrradiationDietInsulinEnergy MetabolismEnergy IntakeObesity, MorbidBody SizeElectric ImpedanceReference ValuesBiological MarkersBone DensityMuscle Fibers, Fast-TwitchMuscle WeaknessHypertensionLeptinDiabetes Mellitus, Type 2QuestionnairesMuscle Fibers, Slow-TwitchLogistic ModelsTandem Mass SpectrometryMuscle FatigueAnalysis of VarianceMotor ActivityCardiovascular DiseasesSpectrometry, Mass, Electrospray IonizationMuscle DenervationSeverity of Illness IndexSmokingBody Weights and MeasuresSex CharacteristicsQuadriceps MuscleMultivariate AnalysisRetrospective StudiesEuropean Continental Ancestry GroupLipidsMitochondria, MusclePredictive Value of TestsPotassium RadioisotopesJapanUnited StatesTreatment OutcomeTriglyceridesBody Fat DistributionBasal MetabolismOdds RatioRisk AssessmentPhysical FitnessMetabolic Syndrome XOxygen Consumption