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The effect of light reflections from the snow on kinematic data collected using stereo-photogrammetry with passive markers
Department of Health Science and Technology, Center for Sensory-Motor Interaction, Aalborg University, Aalborg, Denmark.
Department of Health Science and Technology, Center for Sensory-Motor Interaction, Aalborg University, Aalborg, Denmark.
Department of Health Science and Technology, Center for Sensory-Motor Interaction, Aalborg University, Aalborg, Denmark.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
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2014 (English)In: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 17, no 2, 97-102 p.Article in journal (Refereed) Published
Abstract [en]

This study aimed to compare kinematic data collected during ski-cross starts outdoors on snow in daylight (high albedo) to similar data collected indoors with infiltrating sunlight but without light reflections from the snow (low albedo) using a video-based motion capture system with the active filtering function enabled. A 12-camera 3D motion capture system (Qualisys AB, Sweden) was used to measure test objects and eight skiers performing a ski-cross start on a slope outdoors and on a wooden start ramp indoors. The average residuals and standard deviations of the length of the calibration wand calculated indoors and outdoors by the calibration software were compared using descriptive statistics. Static and moving fixed length measures and thigh length measures were compared using Bland-Altman plots. Calibration residuals were slightly increased outdoors (1.77 mm) compared to indoors (1.54 mm), while wand length varied by 3.63 and 1.51 mm, respectively. Fixed static lengths differed by -8.65 ± 4.94 mm (shorter indoors), whereas fixed moving lengths differed by 0.85 ± 1.05 mm (longer indoors). A randomly chosen marker pair on one segment (Thigh) showed a mean difference of 1.19 ± 22.05 mm (longer indoors). It is concluded that 3D motion capture outdoors on snow in daylight is feasible, provides kinematic data comparable to indoors, and could be used to research biomechanics in snow sports.

Place, publisher, year, edition, pages
2014. Vol. 17, no 2, 97-102 p.
Keyword [en]
3D motion capture system, Active filtering, Outdoor, Ski-cross, Snow
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:miun:diva-20919DOI: 10.1007/s12283-013-0140-0Scopus ID: 2-s2.0-84900512574OAI: oai:DiVA.org:miun-20919DiVA: diva2:683025
Projects
Swedish Winter Sports Research Centre
Note

Published online 11 Oct 2013.

Available from: 2014-01-01 Created: 2014-01-01 Last updated: 2014-05-28Bibliographically approved

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