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Does exercise training interfere with the effects of L-carnitine supplementation?
Reury F P Bacurau1, Francisco Navarro, Reinaldo A Bassit
1Department of Histology and Embryology, University of São Paulo, São Paulo, Brazil.
Nutrition (Burbank, Los Angeles County, Calif.)
|April 8, 2003
Summary
L-carnitine supplementation enhances fatty acid oxidation and exercise performance in rats. The benefits were most pronounced in trained rats, suggesting a synergistic effect between training and L-carnitine.
Area of Science:
- Exercise Physiology
- Nutritional Biochemistry
- Skeletal Muscle Metabolism
Background:
- L-carnitine plays a crucial role in fatty acid transport into mitochondria for beta-oxidation.
- Endogenous carnitine levels and metabolic adaptations are influenced by exercise training.
- Understanding the interplay between L-carnitine supplementation and training is vital for optimizing athletic performance and metabolic health.
Purpose of the Study:
- To investigate the impact of L-carnitine supplementation on muscle carnitine content.
- To assess the effects on glucose and fatty acid metabolism in trained rats.
- To determine the ergogenic potential of L-carnitine in conjunction with exercise.
Main Methods:
- Male Wistar rats underwent a 6-week moderate-intensity training program.
- L-carnitine (28 mg/kg/day) was administered during the final 4 weeks of training.
- Muscle carnitine, coenzyme A, substrate metabolism (glucose, oleate, pyruvate), and time to exhaustion were evaluated.
Main Results:
- L-carnitine supplementation increased time to exhaustion by 14% in sedentary rats and 30.3% in trained rats.
- Supplementation significantly enhanced oleate decarboxylation (17% sedentary, 119% trained) while decreasing glucose and pyruvate decarboxylation.
- Muscle acyl-carnitine content increased significantly, particularly in trained rats.
Conclusions:
- L-carnitine supplementation boosts fatty acid oxidation in skeletal muscle.
- Increased mitochondrial carnitine and acyl-carnitine content contribute to enhanced metabolic flexibility.
- The ergogenic effects of L-carnitine are amplified in trained individuals, highlighting a synergistic relationship.