| Literature DB >> 3202095 |
E J van der Beek1, W van Dokkum, J Schrijver, M Wedel, A W Gaillard, A Wesstra, H van de Weerd, R J Hermus.
Abstract
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.Entities:
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Year: 1988 PMID： 3202095 DOI： 10.1093/ajcn/48.6.1451
Source DB: PubMed Journal: Am J Clin Nutr ISSN： 0002-9165 Impact factor: 7.045