The body vitamin Bsub(1) levels of rats fed a diet containing the minimum requirement of vitamin Bsub(1) is reduced by exercise
2013
Shibata, K. (The University of Shiga Prefecture, Hikone, Shiga (Japan). School of Human Cultures, Department of Food Science and Nutrition) | Fukuwatari, T.
It is thought that increasing energy expenditure increases consumption of vitamin Bsub(1), leading to an increase in the requirement of vitamin Bsub(1). However, evidence supporting this hypothesis is lacking. To examine the hypothesis, initially, we determined the minimum requirement of vitamin Bsub(1) for weaning rats. We found that the minimum requirement of vitamin Bsub(1) for optimum growth of weaning rats was around 0.786 mg thiamin/kg diet. Next, rats fed a diet containing the minimum requirement of vitamin Bsub(1) were forced to swim until exhaustion. Concentrations of vitamin Bsub(1) in the blood and liver as well as urinary excretion of swimming rats decreased significantly compared with those of non-swimming rats (p<0.05), while in rats fed the diet containing a sufficient amount of vitamin Bsub(1) (4.720 mg thiamin/kg diet), vitamin Bsub(1) amounts in the blood, liver and urine were not affected by swimming. We clearly and firstly showed the reduction of body vitamin Bsub(1) following increases in energy expenditure.
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