The Effect of Giving Red Guava Fruit Juice towards Haemoglobin and Vo2max Contents on Maximum Physical Activity

Physical activity can cause to increased production of free radicals that can be reduced the antioxidant so as to affect performance athletes due to happened sport anemia. Free radicals can be prevented or reduced to the delivery of antioxidant. It have been known fruit red guava containing various types of natural antioxidant but never researched for its usefulness to reduce free radical production triggered by physical activity. This study aims to know the effect of giving guava fruit juice towards haemoglobin and VO2max contents on maximum physical activity. Type of this study was experimental research with Randomized Control Group Pretest-Posttest Design. It was conducted at Medan State University Stadium and Physiology Laboratory Faculty Of Sport Science, Medan State University. It was conducted in 3 Months. The population and sample were 20 students of sport which fulfilled the criteria and it was divided into group, namely experimental group and control group. In this study was conducted by measurement Haemoglobin and VO2 content when doing pretest and posttest. Based on the results of data analysis, it found that the red guava juice during training program can increase Hb and VO2max levels in maximum physical activity.