FatigueMuscle FatigueFatigue Syndrome, ChronicMental FatigueDepressionQuestionnairesSeverity of Illness IndexQuality of LifeSymptom AssessmentTreatment OutcomeTime FactorsPainSleep DisordersPsychiatric Status Rating ScalesMuscle ContractionAnxietyMuscle, SkeletalFibromyalgiaPrevalenceProspective StudiesIsometric ContractionFollow-Up StudiesCross-Sectional StudiesBehavioral SymptomsNeoplasmsDepressive DisorderPhysical EnduranceRisk FactorsStress, PsychologicalLongitudinal StudiesElectromyographyChronic DiseasePsychometricsAsthenopiaAffective SymptomsPain MeasurementAnalysis of VarianceOccupational DiseasesExerciseActivities of Daily LivingComorbidityDyspneaTorqueHealth StatusAffectSurvivorsCognitive TherapyAdaptation, PsychologicalCohort StudiesStress Disorders, Post-TraumaticSickness Impact ProfileRetrospective StudiesReproducibility of ResultsSex FactorsCase-Control StudiesDiaphragmHeadachePhysical ExertionSleepPostpoliomyelitis SyndromeSleep Initiation and Maintenance DisordersNeurastheniaMuscle StrengthAge FactorsGastrointestinal DiseasesElectric StimulationAsthmaRegression AnalysisPilot ProjectsMultiple SclerosisSelf ReportCoughWork Schedule ToleranceNauseaExercise TherapyMolecular Sequence DataDisorders of Excessive SomnolenceNeuropsychological TestsCognition DisordersSchizophreniaRespiration DisordersHealth SurveysExercise TestDrug Administration ScheduleLogistic ModelsMotor ActivityNetherlandsMagnetic Resonance ImagingPsychophysiologic DisordersLower Urinary Tract SymptomsDisability EvaluationQuadriceps MuscleExercise ToleranceGastroesophageal RefluxSchizophrenic PsychologyMood DisordersDizzinessFractures, StressRespiratory Tract DiseasesPsychotic Disorders