American Journal of Clinical Nutrition, Vol 48, 1451-1462, Copyright © 1988 by The American Society for Clinical Nutrition, Inc

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Thiamin, riboflavin, and vitamins B-6 and C: impact of combined restricted intake on functional performance in man

EJ van der Beek, W van Dokkum, J Schrijver, M Wedel, AW Gaillard, A Wesstra, H van de Weerd and RJ Hermus
Department of Human Nutrition, TNO-CIVO Toxicology and Nutrition Institute, Zeist, The Netherlands.

A double-blind study of combined restriction of thiamin, riboflavin, and vitamins B-6 and C was carried out with 23 healthy males. During 8 wk of low vitamin intake, 12 deficient subjects consumed daily a diet of normal food products, providing maximally 32.5% of the Dutch Recommended Dietary Allowances (RDA) for thiamin, riboflavin, vitamins B-6 and C. Other vitamins were supplemented at twice the RDA. Eleven control subjects consumed the same diet but with a supplementation of twice the RDA of all vitamins. In deficient subjects blood vitamin levels, urinary vitamin excretion, and erythrocytic enzyme activities decreased; in vitro enzyme stimulation increased. Vitamin depletion had no ill effects on health, physical activity, and mental performance. A significant decrease was observed in aerobic power (VO2max) and onset of blood lactate accumulation (p less than 0.001) of 9.8 and 19.6%, respectively. A combined restricted intake of thiamin, riboflavin, and vitamins B-6 and C causes a decrease in physical performance within a few weeks.

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