M. Straczkowski et al., The effect of a single bout of exhaustive exercise on muscle carbohydrate and lipid metabolism in a rat model of type 2 diabetes mellitus, ACT DIABETO, 37(1), 2000, pp. 47-53
The aim of the present study was to estimate whether a single bout of exhau
stive exercise influences the glycogen and triglyceride (TG) content in red
and white: gastrocnemius muscle and in the liver of rats with experimental
type 2 diabetes. Experiments were carried out on male Wistar rats fed from
8 to 11 weeks of age with isocaloric standard or high-fat diet (HFD) with
a previous injection of low-dose of streptozotocin (STZ) or vehicle at 2 da
ys of age (I, control group; II, HFD; III, STZ; IV, STZ + HFD). Group IV (S
TZ + HFD) represents a model of type 2 diabetes. Basal liver glycogen was m
arkedly lower in all the studied groups compared to controls. Glycogen conc
entration after exercise fell significantly in the examined tissues in all
groups in comparison to basal conditions. A significant TG accumulation in
examined tissues was observed in all the studied groups in comparison to co
ntrols. Exercise decreased tissue TG content in all the groups, but it rema
ined significantly higher in the experimental groups vs, control. We conclu
de that in this model of type 2 diabetes,a single bout of exercise reveals
defective utilization of tissue carbohydrates and lipids.