We also examined the influence of gene polymorphisms on the extent of redox marker variations following exercise that were calculated as the ratios between post- and preexercise values. Significant differences were observed only when analyzing the impact of the GPx1 rs1800668 on AOPP and dROMs variations. In particular, growing AOPP concentration ratios were observed in GPx1 TT mutated homozygous water polo players compared with athletes having other genotypes, while a significant increase in dROM ratios was found in TT or CT subjects compared with wild-type athletes.