The aim of the study is to identify the forces sagging the monofin during swimming. 14 high level swimmers first swam 50 m under water with maximal speed using a standard monofin. Next they swam anchored on the strain-gauge-equipped rope using the monofin famished with the gauges (in the middle and at the tail of its surface). The comparison of forces produced in both trials (using the dynamic statistics methods) demonstrated that the forces sagging the monofin in reaction to water resistance could be interpreted as the only source of swimmer's propulsion.
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