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Mass point versus whole-body modelling of skiers for performance evaluation in alpine skiing
ID
Hladnik, Jurij
(
Avtor
),
ID
Svenšek, Daniel
(
Avtor
),
ID
Jerman, Boris
(
Avtor
),
ID
Supej, Matej
(
Avtor
)
PDF - Predstavitvena datoteka,
prenos
(4,36 MB)
MD5: 0C9E1BD149721DEAE57D34F784563840
URL - Izvorni URL, za dostop obiščite
https://onlinelibrary.wiley.com/doi/10.1111/sms.14325
Galerija slik
Izvleček
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$_{mech}$).
Jezik:
Angleški jezik
Ključne besede:
centre of mass
,
energy dissipation
,
linked-segment model
,
mechanical energy
,
biomechanics
,
giant slalom
,
kinematics
,
statistical parametric mapping
Vrsta gradiva:
Članek v reviji
Tipologija:
1.01 - Izvirni znanstveni članek
Organizacija:
FS - Fakulteta za strojništvo
FMF - Fakulteta za matematiko in fiziko
FŠ - Fakulteta za šport
Status publikacije:
Objavljeno
Različica publikacije:
Objavljena publikacija
Leto izida:
2023
Št. strani:
Str. 943-953
Številčenje:
Vol. 33, iss. 6
PID:
20.500.12556/RUL-146035
UDK:
531.1:796.92
ISSN pri članku:
0905-7188
DOI:
10.1111/sms.14325
COBISS.SI-ID:
142031619
Datum objave v RUL:
18.05.2023
Število ogledov:
817
Število prenosov:
59
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Objavi na:
Gradivo je del revije
Naslov:
Scandinavian journal of medicine & science in sports
Založnik:
Wiley
ISSN:
0905-7188
COBISS.SI-ID:
230378
Licence
Licenca:
CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:
http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:
Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Sekundarni jezik
Jezik:
Slovenski jezik
Ključne besede:
masno središče
,
disipacija energije
,
segmentalni model
,
biomehanika
,
veleslalom
,
kinematika
,
statistično parametrično kartiranje
Projekti
Financer:
ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:
P5-0147
Naslov:
Kineziologija monostrukturnih, polistrukturnih in konvencionalnih športov
Financer:
ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:
L5-4142
Naslov:
Vpiv širine smuči na varnost pri alpskem smučanju
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