Abstract
We examined the effects of a 4% erythritol drink (drink 1) and a 4% glucose drink (drink 2) on alterations in concentrations of plasma glucose, blood lactate, and serum insulin, free fatty acids (FFA) and ketone bodies induced by 90min aerobic exercise. We further examined the effects of 2% erythritol/2% fructose drink (drink 3) and 2% erythritol/1.1% fructose/0.8% glucose drink (drink 4) on alterations in these parameters. Intake of drink 2 during exercise tended to increase the concentrations of plasma glucose and serum insulin, but intake of drink 1 did not. Concentrations of serum FFA and ketone bodies gradually increased with both drink 1 and drink 2, but the increases were higher with drink 1. The values immediately after exercise and 30min later were significantly different between the tests of the two drinks. The blood lactate concentration was not raised during exercise in either test and was not different between the two tests. Intake of drink 3 or drink 4 did not affect exercise-induced alterations in the concentrations of plasma glucose and serum insulin. On the other hand, exercise-induced increases in serum FFA and ketone body concentrations were greater in the test of drink 3, which did not include glucose, and the values after exercise were significantly higher in the test of drink 3 than in the test of drink 4. These results suggest that the fatty acid metabolism promoted by aerobic exercise is inhibited by intake of 0.8-4.0% glucose solution during exercise, but not by intake of 4% erythritol solution or 2% erythritol/2% fructose solution.
