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Cocaine does not alter cardiac glycogen content at rest or during exercise
R K Conlee1, T L Berg, D H Han
1Exercise Biochemistry Laboratory, Brigham Young University, Provo, UT 84602.
Metabolism: Clinical and Experimental
|November 1, 1989
Summary
Cocaine does not affect myocardial glycogen or glucose-6-phosphate levels in rats, even during exercise. This study found no direct or indirect impact of cocaine on heart substrate storage.
Area of Science:
- Cardiology
- Pharmacology
- Exercise Physiology
Background:
- Cocaine is a sympathomimetic drug linked to cardiac events.
- Its impact on myocardial substrate utilization remains unclear.
- Understanding cocaine's cardiac effects is crucial for clinical management.
Purpose of the Study:
- To investigate the effect of cocaine on myocardial substrate utilization.
- To determine if cocaine influences glycogen and glucose-6-phosphate content in the heart.
- To assess these effects under resting and exercise conditions.
Main Methods:
- Rats were administered intravenous saline or varying doses of cocaine hydrochloride.
- Animals underwent either rest or controlled exercise for 20 minutes.
- Cardiac tissue was rapidly harvested and frozen for biochemical analysis.
Main Results:
- Resting glycogen content ranged from 24.9 to 27.0 mumol/g.
- Glucose-6-phosphate levels varied between 0.27 and 0.30 mumol/g.
- Neither cocaine administration nor exercise significantly altered these substrate levels.
Conclusions:
- Cocaine does not directly impact myocardial glycogen storage.
- Cocaine does not indirectly affect myocardial glycogen storage during exercise.
- The study suggests cocaine has no significant effect on key cardiac energy substrates under tested conditions.