PhosphocreatineExercise TestMagnetic Resonance SpectroscopyCreatineExerciseExercise TherapyExercise ToleranceEnergy MetabolismAdenosine TriphosphateMuscle, SkeletalPhysical ExertionOxygen ConsumptionCreatine KinasePhosphatesPhosphorus IsotopesLactic AcidPhosphorusLactatesPhysical EnduranceAdenosine DiphosphateCreatine Kinase, BB FormCreatine Kinase, MM FormMitochondria, MuscleGlycogenMusclesMuscle ContractionHydrogen-Ion ConcentrationCreatine Kinase, Mitochondrial FormGlycolysisOxidative PhosphorylationRestMyocardiumMuscle FatigueBicyclingHeart RateTime FactorsErgometryGuanidinoacetate N-MethyltransferaseAdenine NucleotidesOxygenLegPulmonary Gas ExchangeAspartic AcidBrainHypoxia, BrainHeartPhysical FitnessIsometric ContractionRegional Blood FlowInosine MonophosphateQuadriceps MuscleAdenosine MonophosphateResistance TrainingKineticsDichloroacetic AcidRunningAnaerobic ThresholdMuscle Stretching ExercisesGlucoseAcetylcarnitinePhysical Conditioning, HumanMyocardial ContractionHemodynamicsBlood PressurePerfusionPhosphorus CompoundsAdaptation, PhysiologicalAnoxiaRats, Inbred StrainsAcidosisCholineReference ValuesBrain ChemistryIodoacetic AcidCarbon DioxidePyruvate Dehydrogenase ComplexBreathing ExercisesBlood GlucosePyruvic AcidGlycerylphosphorylcholineAnalysis of VarianceKneeMagnetic Resonance ImagingPerhexilineIodoacetatesRats, WistarForearmAdenylate KinaseHeart FailurePyruvatesProtonsPhysical Education and TrainingMitochondria, HeartDinitrofluorobenzenePropionatesAsthma, Exercise-InducedOxidation-ReductionAmidinotransferasesExercise Movement TechniquesMuscle Fibers, Fast-Twitch