3D measurements of alpine skiing with an inertial sensor motion capture suit and GNSS RTK system
Deutscher übersetzter Titel: | 3D-Messung im alpinen Skisport mit einem bewegungsmessenden Trägheitssensoranzug und dem GNSS-RTK-System |
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Autor: | Supej, Matej |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 28 (2010), 7, S. 759-769, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640411003716934 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201406005263 |
Quelle: | BISp |
Abstract
To date, camcorders have been the device of choice for 3D kinematic measurement in human locomotion, in spite of their limitations. This study examines a novel system involving a GNSS RTK that returns a reference trajectory through the use of a suit, imbedded with inertial sensors, to reveal subject segment motion. The aims were: (1) to validate the system’s precision and (2) to measure an entire alpine ski race and retrieve the results shortly after measuring. For that purpose, four separate experiments were performed: (1) forced pendulum, (2) walking, (3) gate positions, and (4) skiing experiments. Segment movement validity was found to be dependent on the frequency of motion, with high accuracy (0.88, s = 0.68) for 10 s, which equals ~10 slalom turns, while accuracy decreased slightly (2.1°, 3.3°, and 4.2° for 0.5, 1, and 2 Hz oscillations, respectively) during 35 s of data collection. The motion capture suit’s orientation inaccuracy was mostly due to geomagnetic secular variation. The system exhibited high validity regarding the reference trajectory (0.008 m, s = 0.0044) throughout an entire ski race. The system is capable of measuring an entire ski course with less manpower and therefore lower cost compared with camcorder-based techniques. Verf.-Referat