Abstract

Background & aim: Lipid metabolism disorder plays an important role in insulin resistance in skeletal muscle and lipid drop proteins such as perlipine 2 (PLIN2) are effective in regulating intracellular fat metabolism. One of the suggested pathways for the effects of endurance activity in metabolic diseases is the effect of physical activity on intramuscular. Therefore, the purpose of this study was compare the intensity of aerobic exercise intensity (low intensity and high intensity) on expression of PLIN2 skeletal muscle, serum glucose and insulin levels in streptozotocin-diabetic rats.

Methods: In this experimental study, 24 male Wistar rats were randomly divided into three groups of 8, including two intervention groups (low intensity endurance training group and high intensity continuous exercise group) and one control group. After induction of diabetic rats by injection streptozotocin (55 mg / kg body weight), Intraperitoneally, endurance training was applied for eight weeks, three sessions per week in diabetic rats. Exercise intensity in the low-intensity group was equal to 5-8 m / min (equivalent to 50-60% Vo2max), the intensity of training in a high intensity training group was equivalent to a speed of 22-25 m / min (equivalent to 80% Vo2max) and the control group did not receive intervene in this time. Relative protein expression of PLIN2 was performed using western blot technique. Data were analyzed by one-way ANOVA and Tukey's post hoc test.

Results: The results of the intergroup comparison revealed a significant difference among three groups in the PLIN2 variables (p = 0.037). The results of post hoc test showed a significant increase in PLIN2 in high intensity training diabetic group compared to the control group (p = 0.033) However, there was no significant difference in PLIN2 level in the low exercise group compared to the control group (p = 0.18). Also, there was no significant difference between the low intensity and high intensity training groups (p = 0.66). Serum glucose and insulin levels were significantly different between diabetic control groups and low intensity and high intensity training (p = 0.001). This difference was between the high intensity training group with low intensity group (p = 0.04, p = 0.01), diabetes control (p = 0.001, p = 0/000), respectively.

Conclusion: Regarding the results of the study, modulation effects of high intensity endurance exercises on increasing the expression of PLIN2 in diabetic specimens were noted.