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Changes of Plasma Angiogenic Factors During Chronic Resistance Exercise in Type I Diabetic Rats



Shekarchizadeh Esfahani P1, 3 ; Gharakhanlou R2 ; Karimian J3 ; Safarzade A4 ; Khazaei M5
Authors
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Authors Affiliations
  1. 1. Dept. of Physical Education and Sports, Tarbiat Modarres University, Tehran, Iran
  2. 2. Department of Physical Education and Sports, Tarbiat Modarres University, Tehran, Iran
  3. 3. School Management and Medical Informatics, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Dept. of Exercise Physiology, University of Mazandaran, Babolsar, Iran
  5. 5. Dept. of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Pakistan Journal of Medical Sciences Published:2012

Abstract

Objective: Exercise has several beneficial effects on cardiovascular system. However, the exact mechanism is unclear. The purpose of this study was to evaluate the effects of chronic resistance exercise on some plasma angiogenic factors in type 1 diabetic rats. Methodology: Thirty male Wistar rats were divided into three groups of control, diabetic and diabetic trained (n = 10 each). Diabetes was induced by a single intraperitoneal injection of streptozotocin (55 mg/kg). The rats in the trained group undertook one training session per day, 3 days/week, for 4 weeks. Blood samples were taken and the concentrations of plasma glucose, lipid profile, nitric oxide (NO), vascular endothelial growth factor (VEGF) and soluble form of VEGF receptor-1 (sFlt-1) were determined. Results: We found a significant reduction in plasma NO concentrations in diabetic rats compared to the controls (p < 0.05). After four weeks of resistance training, plasma NO concentrations increased (p < 0.05). Plasma VEGF concentrations were not significantly different between diabetic and control groups (p < 0.05). However, plasma sFlt-1 concentrations in diabetic rats were significantly higher than the controls (p > 0.05). There were no significant differences in plasma VEGF and sFlt-1 concentrations between diabetic sedentary and trained groups (p > 0.05). Moreover, VEGF/sFlt-1 ratios in diabetic animals were lower than the control group and resistance exercise could not increase this ratio in diabetic animals (p > 0.05) Conclusion: Resistance exercise could not change plasma VEGF, sFlt-1 and VEGF/sFlt-1 ratio. However, it increased plasma NO concentrations in diabetic animals. More studies are needed to determine the effects of this type of exercise on the angiogenesis process.
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