Tethered swimming has been in use for long in order to measure and evaluate swimmers propulsive force (Magel, 1970; Yeater et al., 1981). Besides being a valid and reliable test (Dopsaj et al., 2003 and Kjendlie & Thorsvald, 2006) its relationship with performance in swimming is questioned (Smith et al., 2002), mainly because changes of arm and hand action seem to occur (Maglischo & Maglischo, 1984). Gathering these factors, studies developed with elite swimmers are required. The aim of the present study was to analyze the relationship among forces and velocity produced by elite swimmers in tethered and free swimming.
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