Hydrodynamics optimization in butterfly swimming: position, drag coefficient and performance.
A kinematic study allowed to define the three most propulsive positions during a butterfly swimming cycle, which were: the end of the external sweep, the end of the internal sweep and the end of thrust. These instantaneous positions were different for the ex-world champion Pankratov when compared to another swimmer. Using manikins and a drag-measuring device, we showed that the end of the internal sweep induced the highest drag values and that Pankratov may reduce energy expenditure by taking up a particular position during the end of the swimming cycle. These results point out the relations between swimming movements, passive drag and swimmers' performance.
Taïar
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R
Centre de Recherche et d'Innovation sur le Sport, Université Claude Bernard, Villeurbanne, France. taiar@univ-lyon1.fr
Sagnes
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P
Henry
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C
Dufour
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Rouard
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AH
D001696:Biomechanical Phenomena; D004734:Energy Metabolism; D006801:Humans; D008348:Manikins; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D012212:Rheology; D013550:Swimming / Q000502:physiology*; D014741:Video Recording; D014867:Water
D014867:Water