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Training increases cardiac glucose uptake during rest and exercise in rats
H Kainulainen1, P Virtanen, H Ruskoaho
1Department of Clinical Sciences, University of Tampere, Finland.
The American Journal of Physiology
|September 1, 1989
Summary
Chronic exercise significantly enhances glucose uptake in rat hearts, both at rest and during swimming. Training alters glucose distribution within the heart, independent of oxygen needs.
Area of Science:
- Cardiology
- Exercise Physiology
- Metabolism
Background:
- Cardiac health is influenced by energy metabolism.
- Understanding how exercise affects myocardial glucose utilization is crucial for cardiovascular research.
Purpose of the Study:
- To investigate the impact of chronic exercise training on regional glucose uptake in the rat left ventricle.
- To examine glucose uptake patterns in resting and swimming conditions.
Main Methods:
- Utilized the 2-deoxyglucose method to measure regional glucose uptake.
- Compared glucose uptake in untrained control rats versus chronically trained rats.
- Assessed glucose uptake in both resting and swimming states.
Main Results:
- Chronic exercise training significantly increased resting left ventricular glucose uptake (from 1.7 to 3.5 mumol.min-1.g protein-1).
- During swimming, trained rats showed higher glucose uptake (3.4 mumol.min-1.g protein-1) compared to untrained rats (2.3 mumol.min-1.g protein-1).
- A subendocardial to subepicardial glucose uptake gradient was observed in resting controls but not in trained or swimming groups.
Conclusions:
- Chronic exercise enhances myocardial glucose uptake capacity.
- Exercise training alters the transmural distribution of glucose uptake in the left ventricle.
- These metabolic adaptations appear independent of oxygen consumption or alternative substrate availability.