| This paper observed the changes of free radical metabolism of college athletes after incremental-load exhaustive exercise, and grey correlation analysis was run to determine the relationship between the antioxidants for the first time. The results showed that, (a) lipid peroxide increased after incremental-load exhaustive exercise; MDA in serum, red blood cell, urine all significantly increased 5 minutes after exercise, and MDA in urine was not back to the normal 20 hours after exercise, (b) T-AOC in serum decreased significantly 5 minutes after exercise, and did not go back to the normal 20 hours after exercise. T-SOD activity in serum and urine increased significantly 5 minutes after exercise, and went back to the normal 20 hours after exercise; CuZn-SOD activity in red blood cell had a downtrend after exercise, but the change were meaningless in statistics; vitamin E in serum decreased significantly 5 minutes after exercise, and went back to the normal 20 hours after exercise, (c) T-SOD activity and MDA in urine are sensitive to exercise, (d) grey correlation analysis revealed that, the relationships between different antioxidants were not the same; T-SOD activity in urine was mainly influenced by the free radical metabolism of kidney; the increase of MDA in urine was mainly caused by the MDA that other organs generated which was discharged by kidney; the MDA that kidney generated also parcipitate in it.
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