The purpose of this study was to examine the force pattern produced during the front crawl swimming cycle, plus to analyze possible relationships of intra-cyclic force variation (dF) with swimming performance. Thirty four competitive swimmers, representing various levels of competitive performance (17.2 ± 2.72 yrs; 1.76 ± 0.09 m; 67.4 ± 9.94 kg; personal best 100 m long course freestyle swimming: 58.39 ± 2.19 s), randomly performed the tethered and free swimming tests. The free swimming velocity was found to be negatively correlated with dF (r = -0.85; p < 0.001). Adding dF with maximum impulse per cycle into a multiple regression model, it was possible to explain 87.6% of the 50 m performance variation. This novel parameter (dF) showed to be a valuable variable to evaluate the swimmers ability to effectively apply force in the water.
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