BicyclingHead Protective DevicesSkatingCraniocerebral TraumaExercise TestProtective ClothingFisheriesAccident PreventionExerciseProtective DevicesAccidents, TrafficOpen Reading FramesTransportationWounds and InjuriesOxygen ConsumptionEnvironment DesignAlismatidaeAthletic InjuriesHeart RateSportsTheftExercise ToleranceRestConservation of Natural ResourcesSafetyPhysical FitnessOff-Road Motor VehiclesFacial InjuriesSupine PositionRenewable EnergyEquipment DesignCardiac OutputHemodynamicsMotor VehiclesStrikes, EmployeeTime FactorsPublic FacilitiesPhysical EnduranceErgometryPulmonary Gas ExchangeWarMotorcyclesReading FramesBlood PressureAngina PectorisRespirationElectrocardiographyAccidentsLaryngeal MasksExercise TherapyFishesMolecular Sequence DataLactatesBase SequenceHealth PromotionStroke VolumeAutomobile DrivingLegLactic AcidAmino Acid SequenceBiomechanical PhenomenaAnaerobic ThresholdEchocardiography, StressInjury Severity ScoreEchocardiography, DopplerHeart FailureWalkingCitiesSchoolsSeat BeltsBelgiumPropranololHealth EducationReproducibility of ResultsRadionuclide AngiographyCloning, MolecularQueenslandGated Blood-Pool ImagingCoronary DiseaseMotor ActivityTravelVentricular Function, LeftMuscle, SkeletalAdrenergic beta-AntagonistsHeart Function TestsEchocardiographyPostureMarylandCarbon DioxidePindololIsraelWashingtonDouble-Blind MethodHeartVascular ResistanceSensitivity and SpecificityEcosystemMetoprololSex FactorsResidence Characteristics