The main aims of this study were to analyze body kinematics of underwater undulatory swimming and to determine the effect of fatigue along 15m. Performance of the undulatory underwater swimming decreased as distance increased, as it was showed by the higher values of the Strouhal number and the lower velocity at 12.5m distance. The swimmers were not able to maintain the high kick frequency from 7.5m to 12.5m and decreased their ankle angle which made the velocity decrease at 12.5m distance. In spite of the fact that the time per cycle was similar at both distances, the lower velocity produced lower cycle length at 12.5m Therefore, the swimmers covered longer distance per cycle at 7.5m.
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