Leitão, L.Karsai, I.Louro, HugoGarrido, N.Conceição, A.Conceição, Ana2026-02-132026-02-1320091303-2968http://hdl.handle.net/10400.15/6000OBJECTIVE: A swimmers performance results from the interaction of propulsive and resistive forces, which can only increase by reducing the resistive forces, or increase the propulsives forces (Toussaint, 2006). Researchers have developed many methods for this type of evaluation, tethered swim (Dopsaj et al., 2003, Taylor et al., 2001) and Mad System (Toussaint, 2006). METHODS: Six males’ swimmers of the portuguese national team (21.8+.9yrs,73.64+6.9 bm,182.26+6.1bh) performed only the arm crawl swimming task, on an ergometer without breathing, with tied and supported legs, and with the head placed in a helmet containing a sensor of force, connected to a computer. The frequency increment was set at 5 cycle/min(C/M) from 35C/M to 55C/M. Four underwater cameras were used to kinematical analysis with APAS. Descriptive statistics were used, and Pearson correlation to identify the correlation between the increase of the propulsive force and swim rate, with a level of significance of p. DISCUSSION & CONCLUSION: The most effective swim rate is the 45C\\M which the swimmer can develop greater propulsive force (128.01 N) whether or not the fastest swim rate analyzed, and the insweep action is the most propulsive on all stroke phases.engTethered SwimPropulsive ForceCrawlSwimming Biomechanicsjournal article