20.500.12556/RUL-137125 Application of experimental measurements in a wind tunnel to the development of a model for aerodynamic drag on elite slalom and giant slalom alpine skiers Aerodynamic drag is a major cause of energy losses during alpine ski racing. Here we developed two models for monitoring the aerodynamic drag on elite alpine skiers in the technical disciplines. While 10 skiers assumed standard positions (high, middle, tuck) with exposure to different wind speeds (40, 60, and 80 km/h) in a wind tunnel, aerodynamic drag was assessed with a force plate, shoulder height with video-based kinematics, and cross-sectional area with interactive image segmentation. The two regression models developed had 3.9–7.7% coefficients of variation and 4.5–16.5% relative limits of agreement. The first was based on the product of the coefficient of aerodynamic drag and cross-sectional area (C$_d$·S) and the second on the coefficient of aerodynamic drag C$_d$ and normalized cross-sectional area of the skier S$_n$, both expressed as a function of normalized shoulder height (h$_n$). In addition, normative values for C$_d$ (0.75 ± 0.09–1.17 ± 0.09), S$_n$ (0.51 ± 0.03–0.99 ± 0.05), h$_n$ (0.48 ± 0.03–0.79 ± 0.02), and C$_d$·S (0.23 ± 0.03–0.66 ± 0.09 m$^2$) were determined for the three different positions and wind speeds. Since the uncertainty in the determination of energy losses due to aerodynamic drag relative to total energy loss with these models is expected to be <2.5%, they provide a valuable tool for analysis of skiing performance. sport biomechanics mechanical modelling energy dissipation energy loss coefficient of aerodynamic drag cross-sectional area performance GNSS GPS šport biomehanika mehansko modeliranje energija disipacija izguba energije površina preseka izvedba alpsko smučanje slalom veleslalom true false true Angleški jezik Slovenski jezik Članek v reviji 2022-06-01 13:43:43 2022-06-01 13:43:45 2022-09-15 04:14:39 0000-00-00 00:00:00 2022 0 0 11 str. iss. 2, art. 902 Vol. 12 Jan. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 796.9 2076-3417 10.3390/app12020902 93746179 applsci-12-00902.pdf applsci-12-00902.pdf 1 9FEBAE78C866EA499B0367A7ACAB6542 8130882b5a7c029c6fca015dc61cff738e1dd8550b318ba76e94a38316f4dfde 469eb74f-e1a0-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156966 https://www.mdpi.com/2076-3417/12/2/902 1 f2828962-e19f-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=156965 Fakulteta za šport 0 0 0