Mobility LimitationSocial ParticipationMuscle StrengthTennesseeWalkingDisabled PersonsMuscle Strength DynamometerActivities of Daily LivingAgingDisability EvaluationLongitudinal StudiesLower ExtremityHealthGeriatric AssessmentMotor ActivityPostural BalanceGaitHand StrengthPennsylvaniaAge FactorsCross-Sectional StudiesHealth StatusTestosteroneRisk FactorsOdds RatioMolecular Sequence DataProspective StudiesUnited StatesProportional Hazards ModelsQuestionnairesBase SequenceObesityAmino Acid SequenceProtein BindingCell LineElectrophoretic Mobility Shift AssaySocial Mobility