Physical EnduranceRunningPhysical Conditioning, AnimalExercisePhysical Education and TrainingMuscle, SkeletalBicyclingAthletesSportsOxygen ConsumptionAthletic PerformancePhysical FitnessMuscle FatiguePhysical ExertionCitrate (si)-SynthaseExercise TestTrack and FieldMuscle StrengthAnaerobic ThresholdExercise ToleranceAdaptation, PhysiologicalExercise TherapyResistance TrainingRespiratory MusclesSwimmingLactic AcidWeight LiftingMitochondria, MusclePerformance-Enhancing SubstancesGlycogenEnergy MetabolismBreathing ExercisesMusculoskeletal Physiological PhenomenaIsometric ContractionMuscle ContractionQuadriceps MuscleSports MedicineHeart RateJoggingMaximal Voluntary VentilationRestBackPhysical Conditioning, HumanAltitudeBody CompositionTime FactorsMuscle Fibers, SkeletalCardiovascular Physiological PhenomenaWalkingFatiguePulmonary Gas Exchange3-Hydroxyacyl CoA DehydrogenasesMuscle Fibers, Fast-TwitchElbowLegPulmonary Disease, Chronic ObstructiveDietary CarbohydratesCardiomegaly, Exercise-InducedRespirationBody WeightCross-Over StudiesElectromyographyPulmonary VentilationSkiingDyspneaLactatesAgingInspiratory CapacityBlood GlucoseMotor ActivityHand StrengthDiaphragmMuscle Fibers, Slow-TwitchMalpighiaceaeAthletic TapeWork of BreathingFatty Acids, NonesterifiedAnalysis of VarianceMusclesOxygenMuscle WeaknessMitochondrial TurnoverMuscle ProteinsDouble-Blind MethodDoping in SportsVital CapacityForced Expiratory VolumeThighTask Performance and AnalysisMyosin Heavy ChainsOxidation-ReductionInhalationLipid MetabolismSoccerRespiratory Function TestsLung Diseases, ObstructiveHormonesRats, WistarCalorimetry, Indirect