Acute Changes in Vitamin B6, Status in Endurance Athletes before and after a Marathon

Abstract

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.

Plasma Vitamins, Amino Acids, and Renal Function in Postexercise Hyperhomocysteinemia

“…Differences in physical activities and experimental models may explain those discrepancies. On the other hand, increased concentrations of PLP have been described after exercise in marathon runners and attributed to the mobilization of the hepatic and erythrocytic reservoirs (24); therefore, an association of independent effects of acute exercise on changes in plasma B vitamins and aminothiols cannot be excluded in our study.…”

- Fluid and Electrolyte Requirements for Female Athletes

“…In spite of reported intakes that meet dietary recommendations, several studies have documented poor vitamin B 6 status (Telford et al 1992;Fogelholm et al 1993;Manore 1994Manore , 2000Rokitzki et al 1994b). For example, Telford et al (1992) studied 86 male and female athletes before and after an 8-month training period.…”

A–Z of nutritional supplements: dietary supplements, sports nutrition foods and ergogenic aids for health and performance: Part 41

“…Although no studies directly investigated the effects of riboflavin on performance in athletes, it was reported that dieting and exercise increase the intake of riboflavin needed to maintain adequate status 17. Several researchers have shown that exercise modifies pyridoxine metabolism with one study reporting losses of 1 mg during a marathon race 18. However, there are no studies on the effects of pyridoxine supplementation on performance per se.…”