Abstract
Muscle fatigue in adolescent soccer athletes can degrade performance during a match. A low Glycemic Load (GL) diet before exercise is believed to improve soccer athlete performance because it can decrease carbohydrate oxidation during exercise and has a lower increase in lactic acid levels than a high GL diet. The study aimed to identify the effect of low and high glycemic load diets on muscle fatigue in adolescent soccer athletes. A quasi experimental with multiple series group design was conducted in November 2019 on 22 adolescent soccer athletes aged 15-17 at the Terang Bangsa Soccer School Semarang. The low GL group was given food with GL 9.15; while the high GL group contained GL 27.29. Diets given once in 2 hours before exercise. Each group was triggered by RAST (Running based Anaerobic Sprint Test) to cause anaerobic muscle fatigue. Muscle fatigue is measured using blood lactic acid, BUN (Blood Urea Nitrogen), and fatigue index. There were no significant differences in blood glucose, lactic acid, and BUN levels between the low GL and high GL groups (p>0.05). Nonetheless, a low GL diet had a smaller increase in blood glucose levels (1.91 mg/dL vs 4.09 mg/dL) and lactic acid (4.5 mg/dL vs 4.7 mg/dL) after exercise than high BG diet. A low GL diet also has a lower fatigue index than a high GL. Keyword: glycemic load diet, muscle fatigue, lactic acid, blood urea nitrogen.
Highlights
There has been a decline in achievement on the Indonesian U-19 national soccer team
This study aims to analyze the differences in the effect of giving low and high glycemic load diets 2 hours before training on muscle fatigue of teenage soccer athletes characterized by levels of lactic acid, blood urea nitrogen (BUN), and fatigue index
There is no significant difference in blood glucose levels at all three times between the two groups (p> 0.05) (Table 3)
Summary
There has been a decline in achievement on the Indonesian U-19 national soccer team. In 2013, the U-19 national team won the AFF (ASEAN Football Federation) trophy. This study aims to analyze the differences in the effect of giving low and high glycemic load diets 2 hours before training on muscle fatigue of teenage soccer athletes characterized by levels of lactic acid, BUN, and fatigue index. The data of fatigue index, lactic acid and BUN levels before intervention, immediately after exercise, 1 hour after exercise (recovery period), and subject characteristics between the two groups were examined using the independent-t-test and Mann-Whitney test. Low consumption levels of carbohydrate intake in both groups led to a lack of muscle and liver glycogen stores This can reduce the rate of ATP regeneration and Ca2+ release in the sarcoplasmic reticulum (RS) during exercise (Ørtenblad et al 2013). This possible occurred because in this study, the carbohydrate content in the low BG group was too low at only 30%
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