Abstract des Autors

The vitamin B1 status of 62 athletes in various types of sports was determined by vitamin B1 intake (7-day weighed food record), whole blood (Lactobacillus viridescens), enzyme activation measurement (alpha-ETK) and urine vitamin B1 (HPLC). The analysis of weighed food record showed that 16.1% of the athletes have an intake below that recommended by the German Nutrition Council (1.2-1.4 mg/d). With respect to vitamin B1/1000 kcal (recommended value 0.5 mg B1/1000 kcal), 35.4% of the athletes have values below the recommended value. Compared with the reference values for controls, 33.8% of the athletes have absolute vitamin B1 intake and 76.2% have relative B1 intake that are below the standard. Only 13.1% of the athletes showed satisfactory vitamin B1 blood levels compared with the reference value of 294+/-26 nmol/l. There is a correlation of r=0.42 between vitamin B1 intake (7-day food record) and blood vitamin B1. By contrast, alpha-ETK showed nearly all athletes to be in the range of reference values (alpha-ETK 1.21+/-0.11). No significant correlations could be determined between vitamin B1 intake and alpha-ETK or with the vitamin B1 urine excretion. Overall, 49.9% of the athletes are below the reference range of the controls with respect to urine excretion. The correlation between the mean vitamin B1 intake over 7 days is r=0.63 and the vitamin B1 intake on the last day (day 7 of the food record) prior to urine collection is r=0.92, between vitamin B1 blood and urine excretion r=0.52. Combined measurement of vitamin B1 intake and thiamine blood concentration appears to be the most suitable procedure in determining vitamin B1 supply/status. Additional studies are necessary for a definitive statement concerning vitamin B1 requirements in intensive physical exertion.
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