The most strategic part of a triathlon is the cycle-run transition. According to the bibliography it is important to remark that authors have used non-specific tests, because physiological (lactate and heart rate) and velocity variables have shown considerable differences between the values obtained from laboratory-based studies and those from real competition (Tables 1 & 2). However, there is a need to perform these kind of studies in competition, when the triathletes are highly motivated and the effort is maximum [1]. Therefore, the objective of the present study was to study the changes in running pattern comparing a top-level competition with relation to laboratory-based studies and to examine the possible differences between men and women elites. The results show significant differences (p<0.05) between men and women in many of the variables analysed. Also, significant differences (p<0.05) were found in men's stride length and velocity between laps.
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