20.500.12556/RUL-146035 Mass point versus whole-body modelling of skiers for performance evaluation in alpine skiing The altitude differential of the specific mechanical energy, diff (e$_{mech}$), is used to evaluate skiing performance. It is defined as the negative differential between the skier's total specific mechanical energy (e$_{mech}$) and the altitude of the skier's center of mass (COM). Till now, e$_{mech}$ was obtained upon a mass-point (MP) model of the skier's COM, which neither considered the segmental energies of their relative movements to the COM, nor their rotational kinetic energies. The aims of the study were therefore: (a) to examine the deviations in diff (e$_{mech}$) between the MP and a more complex linked segment (LS) skier model consisting of 15 rigid bodies, which encountered the aforementioned defectiveness, (b) to compare the energy fluctuations of the two skier models, and (c) to investigate the influence of the gate setup on (a) and (b) in giant slalom. Three-dimensional whole-body kinematics of nine skiers was measured using a global navigation satellite system and an inertial motion capture system while skiing on a predefined course divided into a turny and open gate setup. Mechanical energies including their altitude differentials were calculated for the LS and MP models. There were no significant differences in e$_{mech}$ and diff (e$_{mech}$) ski turn averages, as in individual data points, between both skier models for both analyzed gate setups. The energies additionally considered by the LS model presented a negligible part regardless of the gate setup. In conclusion, the MP skier model is sufficiently accurate for the evaluation of the skiing performance with diff (e$_{mech}$). centre of mass energy dissipation linked-segment model mechanical energy biomechanics giant slalom kinematics statistical parametric mapping masno središče disipacija energije segmentalni model biomehanika veleslalom kinematika statistično parametrično kartiranje true false true Angleški jezik Slovenski jezik Članek v reviji 2023-05-18 11:03:56 2023-05-18 11:03:57 2023-07-04 03:34:57 0000-00-00 00:00:00 2023 0 0 Str. 943-953 iss. 6 Vol. 33 Jun. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531.1:796.92 0905-7188 10.1111/sms.14325 142031619 Scandinavian_Med_Sci_Sports_-_2023_-_Hladnik_-_Mass_point_versus_whole‐body_modeling_of_skiers_for_performance_evaluation.pdf Scandinavian_Med_Sci_Sports_-_2023_-_Hladnik_-_Mass_point_versus_whole‐body_modeling_of_skiers_for_performance_evaluation.pdf 1 0C9E1BD149721DEAE57D34F784563840 b94a2fb105e40e092125e2649f7412e929e44278b282562a39958c9c7f745385 e25183e8-19a5-11ee-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=170941 https://onlinelibrary.wiley.com/doi/10.1111/sms.14325 1 a9097cf6-f55a-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=169138 Fakulteta za strojništvo Fakulteta za matematiko in fiziko Fakulteta za šport 0 0 0