The objective of this study was to observe how disturbing swimming skill execution can influence the superficial parameters of front crawl. There was mixed random-systematic sampling among 5% of high-ability swimmers from São Caetano do Sul, enrolled with DETUR in 2008 (n=106). Disturbance was carried out by light shone onto the retina, forming a configuration according to the degree of complexity. The subjects swam at a natural rhythm. Data were analyzed using Mauchly`s Test of Sphericity and repeated measures ANOVA (Contrast). Probability was 5% (p<0.05). We observed significant differences (p<0.05) in the variable parameters (time, speed, distance and swimming strategy) of front crawl after perception manipulation, even when maintaining the distance to be executed and a normal swimming rhythm.
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