The vitamin status of 13 endurance athletes was determined by whole blood (microbiological) and urine 4-pyridoxic acid (4-PA) (HPLC), serum vitamin (pyridoxal, pyridoxol, pyridoxamin) (HPLC), and erythrocyte α- EGOT measurements with the aid of 7-day records. In addition, blood and serum samples and urine were collected before (Time A), directly after (Time B), and 2 hr after a marathon race (Time C). The total energy intake was 12,303 ± 3,464 Wday (34% fat, 48% carbohydrates, 14% protein). The vitamin intake, serum concentrations, α-EGOT value, and 4-PA excretion were higher than the reference values at Time A. Only the vitamin whole blood levels were below the normal level at Time A. The vitamin B, status of the athletes corresponded essentially to reference values obtained for untrained individuals. There was a mean loss of about 1 mg vitamin as a result of the marathon race. Vitamin supplementation does not appear necessary if a balanced diet is consumed.
L. Rokitzki, M. Büchner, and J. Keul are with the Medizinische Klinik Abt. Sportund Leistungsmedizin. A.N. Sagredos is with the Institut für natunvissenschaftliche, technische Dienste, Hamburg. F. ReuB is with Abt. fur Angewandte Physiologie und Sportmedizin der Universitat Ulm. Direct correspondence to L. Rokitzki, Benedikt Kreutz Rehabilitationszentmm für Herz- und Kreislaufkranke e.V., Südring 15,79189 Bad Krozingen, Germany.