title: Assessment of vitamin B6 status of strength and speedpower athletes.
abstract: OBJECTIVE
  The investigation was designed to obtain information concerning the vitamin B6 status in high-performance athletes.
  
  
  METHODS
  Fifty-seven strength and speedpower athletes were available for examination.
  
  
  METHODS
  Vitamin B6 status was determined by a 7-day weighed food record, enzyme activity (alpha-EGOT) measurement, whole blood concentrations (Saccharomyces carlsbergenisis and 4-pyridoxinic acid (4-PA) excretion (high-pressure liquid chromatography).
  
  
  RESULTS
  The absolute vitamin B6 intake in > 30% of the athletes was below the German recommended dietary allowance (GRDA) and, in relation to the protein intake (GRDA 0.20 mg vitamin B6/g protein), > 60% of the athletes had values below the GRDA. More than 90% of the athletes did not attain the reference value (0.88 nmol/mL) for untrained individuals in vitamin B6 whole blood concentration, and only a few athletes (< 5%) had alpha-EGOT values above the reference value of alpha-EGOT > 1.50). The 4-PA excretion was below the reference value of > 2.73 mumol/g creatinine in 18% of all athletes examined.
  
  
  CONCLUSIONS
  Vitamin B6 status can be quantified using the weighed food record, microbiological whole blood determination, and 4-PA excretion; however, limits of the individual methods must be taken into account. Vitamin B6 supply of the athletes still cannot be definitively assessed because there are no generally valid reference values.
authors.affiliation: Department of Sport and Performance Medicine, Albert-Ludwigs-University, Freiburg, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Rokitzki
authors.forename: A N
authors.initials: AN
authors.lastname: Sagredos
authors.forename: F
authors.initials: F
authors.lastname: Reuss
authors.forename: D
authors.initials: D
authors.lastname: Cufi
authors.forename: J
authors.initials: J
authors.lastname: Keul
mesh_terms: D001219:Aspartate Aminotransferases / Q000097:blood; D015930:Diet Records; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D006801:Humans; D008297:Male; D009752:Nutritional Status; D011735:Pyridoxic Acid / Q000652:urine; D011736:Pyridoxine / Q000008:administration & dosage / Q000097:blood*; D012016:Reference Values; D013177:Sports
chemical_list: D011735:Pyridoxic Acid; D001219:Aspartate Aminotransferases; D011736:Pyridoxine