The purpose of this study was to investigate the relationship between the kinematical parameters and the sprint ability in front crawl swimming. The subjects were nine well-trained male swimmers. They performed front crawl swimming with five different velocities (1.1-1.9 m/s) in swimming flume. The hand trajectory was obtained by three dimensional motion analysis. The propulsive phase was defined as the duration to push water backward. It was observed that there was a significant correlation between the relative propulsive duration in the trial 1.7 m/s and the best record of 50 m freestyle (r = -0.67, p < .05). The relative propulsive duration would have a possibility to be one of the parameters to evaluate the sprint ability in front crawl swimming, although it was difficult to discuss the swimming propulsion using only the kinematical parameter
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