O efeito do aquecimento no rendimento dos 50 m de nado.

Warm-up procedures are usually used by coaches and their swimmers. It is assumed that competitive performance is positively affected, but the literature regarding this matter is ambiguous. The aim of this study was to assess the effect of typical warm-up, used by the swimmers, in the 50 m front crawl swimming performance. 10 national-level swimmers (M ± SD; age: 15.4 ± 1.1 years, height: 1.73 ± 5.1 m, body mass: 62.3 ± 3.9 kg) swam the 50 m front crawl, at maximum velocity, after previous warm-up and without performing the same, in the day after. Capillary blood lactate concentration was assessed after the swimming test (1st and 3rd min of recovery) and the Borg ratings of perceived exertion scale were used. The 50 m swimming times were not different with and without warming up (29.35 ± 1.14 s and 29.35 ± 1.41 s, respectively; p = .86). No differences were observed in lactate values (9.73 ± 1.81 mmol.l-1 and 9.16 ± 2.74 mmol.l-1, respectively; p = .68), as well as in the ratings of perceived exertion (15.10 ± 1.20 e 14.89 ± 1.36, respectively; p = .52). These results suggest that the commonly warm up used by the swimmers does not cause significant changes in the 50 m front crawl swimming performance. [ABSTRACT FROM AUTHOR]