[Metabolic changes in the isolated rat jejunum exposed to continuous light or darkness]

Rats were kept for about seven weeks in continuous light or darkness. The oxygen consumption and glucose consumption by the isolated small intestine were determined. Data were compared to those of control animals kept under a light-dark cycle. Continuous exposure to light resulted in a 21% increase in anaerobic glycolysis. Continuous exposure to darkness increased anaerobic glycolysis by 18 and 12% respectively.