Effect of condition training in Thai soccer players on glutathione antioxidant

Abstract

Physical exercise is importance for soccer players in competion. However, physical exercise can induce free radicats and reduce endogenous antioxidants. The aim of this work to determine the glutathione antioxidant status in 22 soccer players engaged in condition training program at Assumption College Sriracha. Blood samples were taken at pre-training, 1st week, 2nd week of training and post-competition. The results showed that physical characteristics of the subjects were compared with reference group the same age-range and sex. The anthropometric parameters that showed slightly difference were heart rate (67.54+-10.06 beats /min), VO [subscript 2 max (50.03+-12.10ml/kg/min) and leg muscle strength (3.00+-0.054kg/kg body weight) when compared to reference group's heart rate (78.32+-10.53 beats /min), VO[subscript 2] max (45.60+-9.98ml/kg/min) and leg muscle strength (2.24+-0.052kg/kg body weight). The results showed that blood reduced glutathione was significantly decrease after 1st week of training program and slowly restored to the pre-training level in the post-competition. Erythrocyte glutathione peroxidase in the subject's blood taken at the same time as blood reduced glutathione showed the same pattern of changes as reduced glutathione (p<0.05). The exercise intensity of program that was two hours training per day, five days per week including 15 min warm up, 20 min basic technique, 20 min small game, 20 min tactical technique, 30 min full game and 15 min cool down. The average heart rate of each activity were 118.37+-11.18 beats /min, 132.98+-15.05 beats /min, 130.48+-10.41 beats /min, 141.24+-22.7 beats /min, 140.10+-29.81 beats /min and 148.60+-27.0 beats /min respectively. The average heart rate of the entire program was 134.37+-8.86 beats /min, which was 66.5% of maximum heart rate. Therefore, this program was considered to be the moderate intensity exercise according to the average heart rate. The glutathione antioxidant levels in this study demonstrated the significant decrease after the first week of training. In order to avoid this oxidative strees in young soccer players during the re-building period, coaches or trainers should consider to slowly increasing the training intensity at the beginning of the rebuilding period.