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dc.contributor.authorElfmark, Ola
dc.contributor.authorEttema, Gertjan
dc.contributor.authorGilgien, Matthias
dc.contributor.authorJølstad, Petter Andre Husevåg
dc.date.accessioned2022-08-04T11:23:35Z
dc.date.available2022-08-04T11:23:35Z
dc.date.created2022-04-11T11:10:37Z
dc.date.issued2022
dc.identifier.citationSensors. 2022, 22(2), Artikkel 540.en_US
dc.identifier.issn1424-8220
dc.identifier.urihttps://hdl.handle.net/11250/3010137
dc.descriptionThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).en_US
dc.description.abstractThe purpose of this study was to find a generic method to determine the aerial phase of ski jumping in which the athlete is in a steady gliding condition, commonly known as the ‘stable flight’ phase. The aerial phase of ski jumping was investigated from a physical point mass, rather than an athlete–action-centered perspective. An extensive data collection using a differential Global Navigation Satellite System (dGNSS) was carried out in four different hill sizes. A total of 93 jumps performed by 19 athletes of performance level, ranging from junior to World Cup, were measured. Based on our analysis, we propose a generic algorithm that identifies the stable flight based on steady glide aerodynamic conditions, independent of hill size and the performance level of the athletes. The steady gliding is defined as the condition in which the rate-of-change in the lift-to-drag-ratio (LD-ratio) varies within a narrow band-width described by a threshold τ. For this study using dGNSS, τ amounted to 0.01 s−1, regardless of hill size and performance level. While the absolute value of τ may vary when measuring with other sensors, we argue that the methodology and algorithm proposed to find the start and end of a steady glide (stable flight) could be used in future studies as a generic definition and help clarify the communication of results and enable more precise comparisons between studies.en_US
dc.language.isoengen_US
dc.subjectdGNSSen_US
dc.subjectLD-ratioen_US
dc.subjectski jumpingen_US
dc.subjectstable flighten_US
dc.subjectsteady glideen_US
dc.titleKinematic determination of the aerial phase in ski jumpingen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.rights.holder© 2022 by the authorsen_US
dc.source.pagenumber15en_US
dc.source.volume22en_US
dc.source.journalSensorsen_US
dc.source.issue2en_US
dc.identifier.doi10.3390/s22020540
dc.identifier.cristin2016670
dc.description.localcodeInstitutt for fysisk prestasjonsevne / Department of Physical Performanceen_US
dc.source.articlenumber540en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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