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KMID : 1101720160200040048
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Physical Activity and Nutrition
2016 Volume.20 No. 4 p.48 ~ p.52
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Relationship between FAT/CD36 Protein in Skeletal Muscle and Whole-body Fat Oxidation in Endurance-trained Mice
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Kim Ji-Su
Lim Ki-Won
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Abstract
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[Purpose] We investigated the effects of endurance training on the expression of long-chain fatty acid transport proteins in the skeletal muscle and whole-body fat oxidation during endurance exercise.
[Methods] Seven-week-old male ICR mice (n = 12) were divided into 2 groups, namely, Sed (sedentary; non-trained) and Tr (endurance-trained) groups. The Tr group was adapted to treadmill training at a fixed intensity (15 m/min, 8° slope) for 3 days. Next, the exercise intensity was increased while maintaining the 8° slope. In the last week of training, the exercise intensity was set at 25 m/min for 50 min (about 70?75% maximal oxygen uptake for 4 weeks). After the protocol ended, the mice were sacrificed, and tissues were collected for western blot analysis.
[Results] Four weeks of endurance training resulted in a significant increase in the protein levels of FAT/CD36 and CPT?. The FAT/ CD36 protein level in the Tr group was about 1.3-fold greater than that in the Sed group (p < 0.01). Furthermore, the increased CPT? indicated higher activity (19% upregulation) in the Tr group compared to the Sed group (p < 0.05). The FAT/CD36 protein level and the estimated whole-body fat oxidation rate during 1-h exercise were found to be significantly correlated (r = 0.765, p < 0.01).
[Conclusion] We suggest that the increase in FAT/CD36 protein in skeletal muscle by endurance training might be positively associated with whole-body fat oxidation, which might enhance endurance exercise capacity.
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KEYWORD
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FAT/CD36, CPT?, Long-chain fatty acid proteins, Endurance exercise
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