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Exerc Sci > Volume 24(3); 2015 > Article
Exercise Science 2015;24(3): 233-242. doi: https://doi.org/10.15857/ksep.2015.24.3.233
L-arginine와 GPLC의 투여가 고교 축구선수의 혈중 산화질소, 에너지기질 및 피로 물질 변화에 미치는 영향
양승훈1, 권훈겸1, 곽이섭2
1성균관대학교 스포츠과학과
2동의대학교 체육학과
The Effects of L-arginine and GPLC supplementation on plasma nitric oxide, energy substrates and fatigue factors in high school football players
Seung-Hoon Yang1, Hun-Kyeom Kwon1, Yi-Sub Kwak2
Correspondence  Yi-Sub Kwak , Tel: +82-51-890-1546, Email: ysk2003@deu.ac.kr
Received: February 23, 2015;  Accepted: August 18, 2015.  Published online: August 30, 2015.
ABSTRACT
PURPOSE:
The purpose of this study was to investigate the effects of L-arginine and GPLC supplementation on plasma nitric oxide, energy substrates and fatigue factors to football players. 16 football players were recruited from the high school and they were divided into two groups (L-arginine group, n=8; GPLC group, n=8). It is also aimed to evaluate the effect of ergogenic aids (L-arginine, GPLC) administration on the football players performance using Yo-Yo intermittent recovery test (Level 2), which is aerobic-anaerobic mixed exercise similar to actual football game.
METHODS:
Height, weight and body fat were measured before the test in 16 high school football players. At the experiment of pre-administration and post-administration of ergogenic aids (L-arginine, GPLC), blood was collected 3 times (before exercise, after exercise and 30 minutes at recovery stage) to measure and analyze nitric oxide in the blood, fatigue substances (lactate, ammonia and phosphorus) and energy substrate (Glucose and FFA) respectively. During aerobic-anaerobic mixed exercise, when ergogenic aids (L-arginine and GPLC) was administered to the football players, NO concentration is increased in two groups after administration compared to pre-administration at each stage.
RESULTS:
There was significant difference at the recovery stage to L-arginine administration group (p=.003). As for change of energy substrate, human serum glucose concentration decreased significantly in statistics at each stage to L-arginine group (pre, p=.014, post, p=.026, recovery p=.025), and decreased significantly right after exercise and at the recovery stage to GPLC group (p=.047, p=.000). The serum FFA (free fatty acids) concentration by the administration of ergogenic aids (L-arginine, GPLC) had no statistically significant difference in every stage. Among the fatigue substances, serum phosphorus concentration decreased significantly at each stage of L-arginine (p=.031, p=.002, p=.001), and decreased significantly at the recovery stage of GPLC group (p=.014). Ammonia concentration decreased significantly to L-arginine group more than GPLC group at each stage after administration compared to pre-administration (L-arginine: p=.005, p=.005, p=.003, GPLC: p=.002, p=.079, p=.003). And there were significant differences before exercise and at the recovery stage to GPLC group. Lactate decreased significantly at each stage after administration to L-arginine and it significantly decreased before exercise and right after exercise to GPLC like in ammonia (L-arginine: p=.012, p=.022, p=.017, GPLC: p=.006, p=.015).
CONCLUSIONS:
As a result of this research, it was found that NO expression significantly increased from L-arginine dosage group in time of recovery. The generated NO increased the supply and absorption of energy substrates in skeletal muscle metabolism through vasodilation, and decreased accumulation of fatigue substance and delayed the depletion of glucose by having an influence on the increase in blood flow by exercise. n addition, in order to use the method for increasing practical motion performance capability through this research result, it's necessary to take into account a lot more diverse forms of exercise events, exercise intensity, time and frequency, etc. It is thought that there will be the need to do continuous research on this field later.
Key words: Ergogenic aids, L-arginine, GPLC(Glycine propiony-L-carnitine), Nitric oxide, Energy substrates and fatigue factor
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