title: [No relationship between so-called 'haemopyrrollactamuria' and fatigue in secondary-school students].
abstract: OBJECTIVE
  To determine the relationship between urinary haemopyrrollactam (HPL) and subjective fatigue in secondary-school students.
  
  
  METHODS
  Cross-sectional and descriptive.
  
  
  METHODS
  Urine samples were collected from 75 secondary-school students (43 boys and 32 girls, aged 16-18 years) in Nijmegen, the Netherlands. The samples were tested for HPL complex at the Centre for Environmental Medicine (Klinisch Ecologisch Allergie Centrum; KEAC) in Weert. Students also completed the 'Abbreviated fatigue questionnaire'. A score of 21 points was considered the threshold for fatigue.
  
  
  RESULTS
  Of the 75 participants, 22 (29%) had increased HPL complex excretion, including 15 boys (35%) and 7 girls (22%). Overall, 19 (25%) had a fatigue score > 21: 16 boys (37%) and 3 girls (9%). There was no statistical relationship between increased HPL complex excretion and fatigue score.
  
  
  CONCLUSIONS
  These findings do not support a relationship between fatigue and increased urinary HPL complex excretion.
authors.affiliation: Stedelijk Gymnasium Nijmegen, Nijmegen. abby87@gmail.com
authors.forename: A
authors.initials: A
authors.lastname: Konijnenberg
authors.forename: M P T
authors.initials: MP
authors.lastname: Megens
authors.forename: P M W
authors.initials: PM
authors.lastname: Willems
mesh_terms: D000293:Adolescent; D003430:Cross-Sectional Studies; D005221:Fatigue / Q000652:urine*; D005260:Female; D006801:Humans; D008297:Male; D011758:Pyrroles / Q000652:urine*; D011795:Surveys and Questionnaires; D016482:Urinalysis / Q000379:methods*
chemical_list: D011758:Pyrroles; C016485:hemopyrrole