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Aerodynamic Drag Modeling Of Alpine Skiers Performing Giant Slalom Turns.
MedLine Citation:
PMID:  22143110     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: Aerodynamic drag plays an important role in performance for athletes practicing sports that involve high velocity motions. In giant slalom, the skier is continuously changing his body posture and this affects the energy dissipated in aerodynamic drag. It is therefore important to quantify this energy to understand the dynamic behaviour of the skier. The aims of this study were to model the aerodynamic drag of alpine skiers in giant slalom simulated conditions, and to apply these models in a field experiment to estimate energy dissipated through aerodynamic drag. METHODS: The aerodynamic characteristics of 15 recreational male and female skiers were measured in a wind tunnel while holding nine different skiing-specific postures. The drag and the frontal area were recorded simultaneously for each posture. Four generalised and two individualized models of the drag coefficient were built, using different sets of parameters. These models were subsequently applied in a field study designed to compare the aerodynamic energy losses between a dynamic and a compact skiing technique. RESULTS: The generalized models estimated aerodynamic drag with an accuracy of between 11.00 % and 14.28 %, and the individualized models with an accuracy of between 4.52 % and 5.30 %. The individualized model used for the field study showed that using a dynamic technique lead to 10 % more aerodynamic drag energy loss than using a compact technique. DISCUSSION: The individualized models were capable of discriminating different techniques performed by advanced skiers, and appeared more accurate than the generalized models. The models presented here offer a simple yet accurate method to estimate the aerodynamic drag acting upon alpine skiers while rapidly moving through the range of positions typical to turning technique.
Authors:
Frédéric Meyer; David Le Pelley; Fabio Borrani
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-2
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1Sport Science Institute, University of Lausanne, Switzerland 2Mechanical Engineering Dept, University of Auckland, New Zealand 3Sport and Exercise Science Department, University of Auckland, New Zealand.
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