The purpose of this study was to examine the relationships between the race performance and elapsed time in each phase composing the race. The races of Japanese top 113 male and 117 female swimmers in the 100 m freestyle event were analysed. For analysis, races were divided into four phases: start, turn, finish, and first and second half of stroke phases. Statistically significant correlations between the total race time and the times of the four phases were obtained (p<0.001). From these simple linear regression analyses, new procedure predicting the total race time from the elapsed time of the four phases was re-established. In both male and female swimmers, the time of two stroke phases (male: r=0.692, r=0.797, female: r=0.874, r=0.876) and turn phase (male: r=0.710, female: r=0.869) were highly correlated with the total race time.
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