dc.contributor.author | Yamazaki, Junya | |
dc.contributor.author | Gilgien, Matthias | |
dc.contributor.author | Kleiven, Svein | |
dc.contributor.author | McIntosh, Andrew S. | |
dc.contributor.author | Nachbauer, Werner | |
dc.contributor.author | Müller, Erich | |
dc.contributor.author | Bere, Tone Tufte | |
dc.contributor.author | Bahr, Roald | |
dc.contributor.author | Krosshaug, Tron | |
dc.date.accessioned | 2016-06-29T10:52:24Z | |
dc.date.available | 2016-06-29T10:52:24Z | |
dc.date.issued | 2015-06 | |
dc.identifier.citation | Medicine & Science in Sports & Exercise. 2015, 47, 1113-1118 | nb_NO |
dc.identifier.uri | http://hdl.handle.net/11250/2394604 | |
dc.description | Dette er siste tekst-versjon av artikkelen, og den kan inneholde små forskjeller
fra forlagets pdf-versjon. Forlagets pdf-versjon finner du på www.lww.com:
http://dx.doi.org/10.1249/MSS.0000000000000511 / This is the final text version of the article, and it may contain minor differences
from the journal's pdf version. The original publication is available at
www.lww.com: http://dx.doi.org/10.1249/MSS.0000000000000511 | nb_NO |
dc.description.abstract | Traumatic brain injury (TBI) is the leading cause of death in alpine skiing. It has been found that helmet use can reduce the incidence of head injuries between 15% and 60%. However, knowledge on optimal helmet performance criteria in World Cup alpine skiing is currently limited owing to the lack of biomechanical data from real crash situations.
Purpose: This study aimed to estimate impact velocities in a severe TBI case in World Cup alpine skiing.
Methods: Video sequences from a TBI case in World Cup alpine skiing were analyzed using a model-based image matching technique. Video sequences from four camera views were obtained in full high-definition (1080p) format. A three-dimensional model of the course was built based on accurate measurements of piste landmarks and matched to the background video footage using the animation software Poser 4. A trunk–neck–head model was used for tracking the skier’s trajectory.
Results: Immediately before head impact, the downward velocity component was estimated to be 8 m·s-1. After impact, the upward velocity was 3 m·s-1, whereas the velocity parallel to the slope surface was reduced from 33 m·s-1 to 22 m·s-1. The frontal plane angular velocity of the head changed from 80 rad·s-1 left tilt immediately before impact to 20 rad·s-1 right tilt immediately after impact.
Conclusions: A unique combination of high-definition video footage and accurate measurements of landmarks in the slope made possible a high-quality analysis of head impact velocity in a severe TBI case. The estimates can provide crucial information on how to prevent TBI through helmet performance criteria and design | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | American College of Sports Medicine | nb_NO |
dc.subject | traumatic brain injury | nb_NO |
dc.subject | skiing injury | nb_NO |
dc.subject | alpine skiing | nb_NO |
dc.subject | helmet | nb_NO |
dc.subject | biomechanics | nb_NO |
dc.subject | model-based image matching technique | nb_NO |
dc.title | Analysis of a severe head injury in world cup alpine skiing | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.subject.nsi | VDP::Social science: 200 | nb_NO |
dc.subject.nsi | VDP::Social science: 200::Social science in sports: 330 | nb_NO |
dc.subject.nsi | VDP::Social science: 200::Social science in sports: 330::Other subjects within physical education: 339 | nb_NO |
dc.source.journal | Medicine & Science in Sports & Exercise | nb_NO |
dc.identifier.doi | 10.1249/MSS.0000000000000511 | |
dc.description.localcode | Seksjon for fysisk prestasjonsevne / Department of Physical Performance | nb_NO |