The Effect On Human Performance And Blood Antioxidant Capacity When Ingesting Glycopeptide Beverage On One-off Resistance Exercise

Purpose:high-intensity exercise induces excessive production of free radicals and reinforcement reaction of lipid peroxidation in the human body, leading to damage tissues and cells. Many studies have shown that added antioxidants can reduce oxidative damage and improve antioxidant capacity, but mostly from the changes of post-exercise antioxidant enzyme activity and free radical product to research. In this study, to observe the influence on human serum antioxidant capacity and motor ability when intake glycopeptides beverage on one-off resistance exercise, in terms of phase changes of antioxidant enzyme activity, free radicals product under xanthine oxidase pathway.Methods:30 male athletes as subjects were randomly divided into three groups, completed 3 sets of 8 repetition maximum strength training at 80%,100%,100%, respectively. Repetitions in the third set were recorded. Each set of exercise consist of bench press, 1at pull-down, leg extension and leg curl. Completion time of each movement less than 20 seconds, rest intervals between each movement was 20 seconds, rest intervals between each set was 120 seconds. At 30 minutes before exercise(6ml/kg), immediately after the second set exercise(3ml/kg) and immediately after the third set exercise(6ml/kg), three different beverages HCP, CP, CHO were received respectively, which HCP glycopeptides ratio of 2:1, CP glycopeptides ratio of 4:1, CHO is a pure carbohydrate beverage. Antecubital vein blood were drawn at before exercise, immediately after exercise, 1h post-exercise,6h post-exercise and 24h post-exercise, to measure biochemical parameters.Results:(1)Non-significant difference between groups were found in the overall load per lean body mass to volitional fatigue; Time-varying differences in blood glucose and lactate were highly significant (P<0.01), insulin with a significant(P<0.05); At 1h post-exercise blood glucose level in A group was higher than C group, the difference was highly significant(P<0.01). (2)Serum superoxide dismutase activity, glutathione peroxidase activity, total antioxidant capacity level and malondialdehyde concentration differences between groups have no significant; Time-varying differences in serum T-AOC level and MDA concentration were highly significant(P<0.01), SOD activity with a significant(P<0.05), GSH-Px activity with no significant. (3)Serum hypoxanthine, xanthine, uric acid concentrations differences between groups have no significant; Time-varying differences were highly significant(P<0.01).Conclusions:(1) Intake of glycopeptides beverage on one-off resistance exercise does not improve athlete's movement. Compared with taking simple sugar beverage, glycopeptides beverage has the tendency to promote insulin secretion. (2) The effect of enhancing antioxidant capacity of human blood when intake glycopeptides beverage on one-off resistance exercise was not obvious. (3) The influence on free radicals generation through xanthine oxidase pathway when intake glycopeptides beverage on one-off resistance exercise was not noticeable.