Several recent studies have documented an apparent increase in riboflavin requirements accompanying an increase in physical exercise in human subjects. This may reflect the fact that anabolic influences and the accretion of new lean body mass creates a demand for the vitamin, for mitochondrial accretion.
Intriguingly, there is also some evidence that indices of neuromuscular function, as illustrated by 'hand-steadiness, may be influenced by riboflavin status in communities where riboflavin deficiency is endemic. If confirmed, this might raise the possibility that peripheral neurological function could be affected by riboflavin status in mammals, including humans, as it is in birds.
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