Events longer than 50 meters require some tactical skills in order to manage the increase of fatigue, such as distributing the effort evenly over the whole distance. Kinaesthetic differentiation skills are required to achieve a very high precision of the movements. The repeatability of two procedures, aimed to measure the kinaesthetic differentiation abilities of swimmers was studied and the correlations between the actual performances and the expected performances with respect to gender and to the degree of change in velocity, were observed. Collecting the data in a single day and during four days running resulted in reliable results. Male swimmers seem to differentiate better than females and show a generally higher coefficient of correlation between the actual and the expected performance.
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