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dc.date.accessioned2020-05-09T19:56:15Z
dc.date.created2019-11-25T14:38:32Z
dc.date.issued2020
dc.identifier.citationGløersen, Øyvind Nøstdahl Gilgien, Matthias Dysthe, Dag Kristian Malthe-Sørenssen, Anders Losnegard, Thomas Johansen . Oxygen Demand, Uptake, and Deficits in Elite Cross-country Skiers during a 15-km Race. Medicine & Science in Sports & Exercise. 2019
dc.identifier.urihttp://hdl.handle.net/10852/75344
dc.description.abstractPurpose This study aimed to quantify the repeated oxygen deficits attained during intermittent endurance exercise by measuring oxygen consumption (V˙O2) and oxygen demand (V˙O2dem) throughout a simulated roller ski race. Methods Eight male elite cross-country skiers (V˙O2peak, 77.4 ± 4.4 mL·kg−1⋅min−1) raced a 13.5-km roller ski time trial on a World Cup course. On two additional days, athletes completed (i) six submaximal loads (~5 min) and ~4-min maximal trial to establish athlete-specific estimates of skiing economy, V˙O2peak, and maximal ΣO2def (MAOD); and (ii) a simulation of the time trial on a roller skiing treadmill. During the simulation, external work rate (Pprop) and skiing speed (v) were adjusted to match the Pprop and v measured during the time trial, and pulmonary V˙O2 was measured breath by breath. V˙O2dem and ΣO2def were calculated using an athlete-specific model for skiing economy throughout the treadmill simulation. Results During the treadmill simulation, V˙O2 was on average 0.77 V˙O2peak, and active V˙O2dem (i.e., excluding the time in simulated downhill) was on average 1.01 V˙O2peak. The athletes repeatedly attained substantial oxygen deficits in individual uphill sections of the treadmill simulation, but the deficits were typically small compared with their MAOD (average 14%, range ~0%–50%). However, the ΣO2def summed over all periods of active propulsion was on average 3.8 MAOD. Conclusion Athletes repeatedly attain substantial oxygen deficits in the uphill segments of a distance cross-country ski race. Furthermore, the total accumulated oxygen deficit of all these segments is several times higher than the athletes’ MAOD. This suggests that the rapid recovery of the energy stores represented by the oxygen deficit is necessary during downhill sections, and that this might be an important determinant of distance skiing performance.en_US
dc.languageEN
dc.publisherAmerican College of Sports Medicine
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleOxygen Demand, Uptake, and Deficits in Elite Cross-country Skiers during a 15-km Raceen_US
dc.typeJournal articleen_US
dc.creator.authorGløersen, Øyvind Nøstdahl
dc.creator.authorGilgien, Matthias
dc.creator.authorDysthe, Dag Kristian
dc.creator.authorMalthe-Sørenssen, Anders
dc.creator.authorLosnegard, Thomas Johansen
cristin.unitcode185,15,4,0
cristin.unitnameFysisk institutt
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.cristin1751963
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Medicine & Science in Sports & Exercise&rft.volume=&rft.spage=&rft.date=2019
dc.identifier.jtitleMedicine & Science in Sports & Exercise
dc.identifier.volume52
dc.identifier.issue4
dc.identifier.startpage983
dc.identifier.endpage992
dc.identifier.pagecount45
dc.identifier.doihttps://doi.org/10.1249/MSS.0000000000002209
dc.identifier.urnURN:NBN:no-78401
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0195-9131
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/75344/5/Gloersen%2BMed%2B%26%2BSci%2BIn%2BSports%2B%26%2BExercise%2B2019.pdf
dc.type.versionPublishedVersion


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