The effects of red ginseng intake on central and peripheral fatigue in non-trained and trained mice = The effects of red ginseng intake on central and peripheral fatigue in non-trained and trained mice
저자
발행기관
학술지명
권호사항
발행연도
2015
작성언어
Korean
주제어
KDC
692
자료형태
학술저널
수록면
23-29(7쪽)
제공처
중단사유
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Exercise training is a process of enhancing one’s performance level by using the adaptability of the body towards certain exercise stimulus. Fatigue is an inevitable physiological phenomenon that develops in accordance with training that is caused by the peripheral and central nervous systems. Fatigue is mainly divided into central nervous system fatigue, which the cerebrum perceives, and peripheral fatigue, which occurs in muscle and nerve tissues. There are a few natural substances that are so-called adaptogen in Korea, including Korean ginseng and red ginseng (RG), as well as otherfamiliar medicinal herbs. Ginsenoside (Rg1, Rb1, Rg2, etc.) is known to be the main ingredient that shows such effects in RG. Also, it has been found to have beneficial effects on physical and brain activity. This study aims to analyze energy utilization from RG administration alone and from the combination of RG administration and exercise, and to investigate the mechanism and the effect of RG administration on exercise-induced fatigue by analyzing 5-HT mRNAs, a central nervous system fatigue factor that is induced during pre-exercise, post-exercise, and recovery, energy utilization during resting and exercise (a peripheral fatigue factor), and glycogen contents in tissues and change in proteins related to energy control through 2 weeks intervention of RG and treadmill training in an animal model. In study 1, the resting metabolic rate was measured for 24 hours before and after the 2 week experimental periods. The total amount of food intake was significantly higher in the RG group than in the control group (CON) (p<0.05), whereas mean body weight was the same. Oxygen uptake during 24 hours both before and after the experimental session was the same between the two groups. Resting carbohydrate oxidation and fat oxidation were the same between the two groups. Likewise, there was no difference in the expression of mRNAs related to energy substrate utilization in skeletal muscle (gastrocnemius) between the groups. Accordingly, we suggest that for the administration of red ginseng at rest to be more effective, a follow-up study (Study 2) was needed as the administration of RG at rest was different from that during exercise. In study 2, the neurotransmitter associated with central fatigue, TPH and 5-HTT mRNAs appeared to be not significantly different in the brain. And, in the RG group with treadmill exercise training (RG-Tr), the expression of 5-HTT and 5-HT1A and 5-HT2A m RNA in the hypothalamus, dorsal raphe and hippocampus were lower compared to the CON-Tr group. The inhibition of expression of 5-HTT and the 5-HT receptors (5-HT1A and 5-HT2A) was shown to be effective on fatigue caused by exercise. However, in this study brain analysis showed only a tendency, not a significant difference, which was caused by the limited number of analyzed subjects (n=3). The changes in energy utilization parameters associated with peripheral fatigue, and the resting metabolic rate for 24 hours were measured before and after the 2 week experimental periods. There was no change in resting metabolism between the CON-Tr and RG-Tr groups. However, the increased fat oxidation occurred after the initial 20 min of the 1 hour exercise period. Also it significantly saved glycogen in the liver. The glycogen saving effect tended to increase in white gastrocnemius after the 2 week training, immediately after 1 hour of exercise. Nevertheless, there were no changes in related expression of mRNA related to carbohydrate or fat metabolism in the gastrocnemius muscle. In conclusion, sole intake of RG did not induce any noticeable effect on resting (study 1). However, RG intake did have an effect on the response to body’s changing conditions from exercise, which induces strenuous impact to body like disruptive homeostasis and induced exercise stress. Therefore, the results of our study taken together, show that the intake of RG is an effective ergogenic aid in improving endurance exercise. From this study, it is seen that further research on finding a supplement (ergogenic aids) that helps improve exercise ability is required.
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