A 3-day dietary manipulation affects muscle glycogen and results in modifications of carbohydrate and fat metabolism during exercise when hyperglycaemic

The effect of hyperglycaemia on exercise with low and elevated muscle glycogen on glucose utilization (GUR), carbohydrate and fat oxidation, hormonal and metabolite responses, as well as rating of perceived exertion (RPE) were explored.Five healthy trained males were exercised for 90 min at 70% V̇Oin two trials, while glucose was infused intravenously at rates to "clamp" blood glucose at 12 mM. On one occasion, participants were 'loaded' with carbohydrate (CHO-L), whilst on a separate occasion, participants were glycogen depleted (CHO-D). Prior exercise and dietary manipulations produced the 'loaded' and 'depleted' states.The CHO-L and CHO-D conditions resulted in muscle glycogen concentrations of 377 and 159 mmol/g dw, respectively. Hyperglycaemia elevated plasma insulin concentrations with higher levels for CHO-L than for CHO-D (P 0.05). The RPE over the exercise period was higher for CHO-D than CHO-L (P < 0.05).Hyperglycaemia during exercise, when muscle glycogen is reduced, attenuates insulin but promotes catecholamines and fat metabolites. The effect is a subsequent elevation of fat oxidation, a reduction in CHO oxidation without a concomitant increase in GUR, and an increase in RPE