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Exercise training restores abnormal myocardial glucose utilization and cardiac function in diabetes
Tom L Broderick1, Paul Poirier, Melissa Gillis
1Department of Physiology, Midwestern University, 19555 59th Avenue, Glendale, AZ 85308, USA. tbrode@midwestern.edu
Diabetes/Metabolism Research and Reviews
|September 24, 2004
Summary
Exercise training prevents reduced myocardial glucose metabolism and improves cardiac function in diabetic rats. This intervention enhances glucose oxidation and recovery after ischemia, highlighting exercise benefits for diabetic cardiomyopathy.
Area of Science:
- Cardiovascular Physiology
- Metabolic Disease Research
- Exercise Science
Background:
- Diabetic cardiomyopathy is linked to reduced myocardial glucose utilization.
- This study investigates exercise training's effect on diabetic heart metabolism.
Purpose of the Study:
- To determine if exercise training can prevent reduced glucose utilization in the diabetic rat heart.
- To assess exercise training's impact on cardiac function and response to ischemia in diabetic rats.
Main Methods:
- Diabetes induced via streptozotocin in Sprague-Dawley rats.
- 10 weeks of treadmill running followed by isolated working heart perfusions.
- Assessment of myocardial glucose utilization, cardiac function, and response to ischemia/reperfusion.
Main Results:
- Diabetic hearts showed lower glucose oxidation and glycolysis, with impaired cardiac function.
- Exercise training restored glucose metabolism and improved cardiac performance in diabetic rats.
- Exercise attenuated the decrease in glycolysis during ischemia and enhanced functional recovery post-ischemia.
Conclusions:
- Exercise training effectively prevents the decline in myocardial glucose metabolism in diabetic rats.
- Improved glucose metabolism and cardiac function suggest exercise benefits for diabetic cardiomyopathy.
- Exercise training enhances the heart's resilience to ischemic events in diabetes.