Influence/effectiveness of carrot and orange mix juice on ṼO2Max in soccer players

Background: Cardiorespiratory endurance is one of the main factors for exercising. Cardiorespiratory endurance can be known by measuring ṼO2max. Fruits and vegetables intake can give beneficial impact for endurance athletes. Fruits and vegetables are thought to affect endurance by delaying fatigue caused by nutrients contained such as carbohydrates, vitamins, minerals, and phytochemicals. Previous studies stated that fruit sources of carbohydrates are known to improve ṼO2maks. Beta carotene and vitamin C have been proven to increase endurance. Carrots and oranges are high in beta carotene and vitamin C. Carrot and orange also contain a high level of potassium. Potassium is one of the main mineral which is needed for endurance exercise and it also has the potential to help carbohydrates metabolism in converting glucose to glycogen which later saved by the liver as an energy source. The effect of the combination of beta carotene, vitamin C and potassium on carrot and orange juice on cardiorespiratory endurance in athletes requires further analysis. Indonesian Journal of Nutrition and Dietetics Vol. 7, No. 1, 2019: 23-30 Available online at: http://ejo rnal.almaat . ac.id/index.php/IJND DOI : http://dx.doi. org/10.21927/ijnd.2019. 7(1). 23-30 24 Yeri A. Putri, Eni Yusniati, Diana Nurrohima, Herviana, Desty Ervira Puspaningtyas,Yuni Afriani, Vol 7 No. 1, 2019: 23-30 Carrots and oranges are natural sources of carbohydrates and electrolytes. Carrots are a type of vegetable that is high in carbohydrates, potassium, and antioxidants. The kind of simple carbohydrates in citrus fruits are fructose, glucose, and sucrose which can provide energy source quickly (9). The high content of beta-carotene from carrots and high vitamin C content in orange have the potential as antioxidants to help oxidative inhibition that can occur during endurance exercise thus preventing fatigue and improving cardiorespiratory endurance. Potassium in carrots and oranges works for fluid balance of the body and is responsible for delivering nerve impulses and muscle contractions. A study states thatincreased activity of Na +, K +, and ATPase during exercise can stabilize the concentration of sodium and potassium in the membrane so that it can prevent fatigue (10). Potassium also influences the uptake and transport of glucose in the small intestine for it to can be used as an energy source (11). UKM bola UAD (Universitas Ahmad Dahlan) has a training schedule for four times a week with 90 minutes duration in each timeline. The endurance training program carried out in the form of jogging, zig-zag running, hurdles, and twisting which done for 40 minutes every three times a week. On the average, the Members of UKM have an excellent nutritional status which is around 77.27% of the population. According to the last ṼO2max records which were measured by using bleep test, it shows the mean of ṼO2max that had been accomplished by the population only around 43.74 ml/kg/min which Objectives: The purpose of this study was to assess the effect of carrot-orange juice on ṼO2max in soccer players. Methods: This study was a quasi-experimental with pre-post test without control group design. There were nine soccer players from Universitas Ahmad Dahlan Yogyakarta that were taken by using purposive sampling which is match with criteria. The subject had been given 250 ml of carrot-orange juice for 13 days. ṼO2max was measured by using a yoyo intermittent recovery test I. All data were analyzed by paired T-test. Results: The mean of ṼO2max in soccer players before consuming carrot-orange juice is 44.02 ± 2.66 ml /kg /min and after consuming carrot-orange juice is 45.88 ± 3.11 66 ml /kg /min. There was significant ṼO2max difference after carrot-orange (p= 0.003). Conclusion: Consumption of carrot-orange juice for 13 days effectively increase ṼO2max level of soccer players.