A new system for analyzing swim fin propulsion based on human kinematic data |
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| Authors: | Guillaume Nicolas Benoit Bideau Nicolas Bideau Briac Colobert Gaël Le Guerroue Paul Delamarche |
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| Institution: | 1. Laboratoire M2S “Physiologie et Biomécanique”, Université de Rennes 2—ENS Cachan, Avenue Charles Tillon, 35044 Rennes, France;2. Institut de Recherche Mathématique de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France;1. Center for the Study and the Transformation of Physical Activities (CETAPS), Faculty of Sport Sciences, University of Rouen Normandy, UNIROUEN, 76821 Mont Saint Aignan, France;2. Interuniversity Biology and Motricity Laboratory (LIBM), University Savoie Mont Blanc, 73376 Le Bourget du Lac Cedex, France;3. Department of Medicine, Surgery and NeuroScience, University of Siena, Via Banchi di Sotto, 55, Siena SI, Italy;4. Sport Science Department, Medicine and Science Sport Institute, Italian National Olympic Committee (CONI), Foro Italico, Largo Lauro de Bosis 15, 00135 Roma, Italy;1. Faculty of Health Science, Department of Health and Sports, Niigata University of Health and Welfare, Japan;2. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Japan;3. Department of Physical Performance, Norwegian School of Sport Sciences, Norway;4. Department of Mechanical Engineering, Meiji University, Japan;5. Faculty of Health and Sport Sciences, University of Tsukuba, Japan;6. Faculty of Health Sciences, The University of Sydney, Australia;1. Universidade Católica de Brasília, Programa de Mestrado e Doutorado em Educação Física, QS 07 lote 01 EPCT, bloco G, sala 116, 71966-900 Brasília, DF, Brazil;2. Universidade Federal do Vale do São Francisco, Petrolina, PE, Brazil |
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| Abstract: | The use of swim fins has become popular in various water sport activities. While numerous models of swim fin with various innovative shapes have been subjectively designed, the exact influence of the fin characteristics on swimming performance is still much debated, and remains difficult to quantify. To date, the most common approach for evaluating swim fin propulsion is based on the study of “swimmer-fins” as a global system, where physiological and/or biomechanical responses are considered. However, reproducible swimming technique is difficult (or even impossible) to obtain on human body and may lead to discrepancies in data acquired between trials. In this study, we present and validate a new automat called HERMES which enables an evaluation of various swim fins during an adjustable, standardized and reproducible motion. This test bench reliably and accurately reproduces human fin-swimming motions, and gives resulting dynamic measurements at the ankle joint. Seven fins with various geometrical and mechanical characteristics were tested. For each swim fin, ankle force and hydromechanical efficiency (useful mechanical power output divided by mechanical power input delivered by the motors) were calculated. Efficiencies reported in our study were high (close to 70% for some swim fins) over a narrow range of Strouhal number (St) and peaks within the interval 0.2<St<0.4, as shown in previous studies on flying or swimming animals. Therefore, an interesting prospect in this work would be to accurately study the impact of adjustable fin kinematics and material (design and mechanical properties) on the wake structure and on efficiency. |
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