Abstract:
PURPOSE:This study aimed to quantify the repeated oxygen deficits attained during intermittent endurance exercise by measuring oxygen consumption (V˙O2) and oxygen demand (V˙O2) throughout a simulated roller ski race. METHODS:Eight male elite cross-country skiers (V˙O2peak, 77.4 ± 4.4 mL·kg⋅min) 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 ΣO2 (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˙O2 and ΣO2 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˙O2 (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 ΣO2 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.
journal_name
Med Sci Sports Exercjournal_title
Medicine and science in sports and exerciseauthors
Gløersen Ø,Gilgien M,Dysthe DK,Malthe-Sørenssen A,Losnegard Tdoi
10.1249/MSS.0000000000002209subject
Has Abstractpub_date
2020-04-01 00:00:00pages
983-992issue
4eissn
0195-9131issn
1530-0315journal_volume
52pub_type
杂志文章abstract::The knee joints of 81 veteran soccer players between ages 40 and 74 were examined. An analysis of and relationships between soccer practice at a top level, osteoarthritis, meniscectomy, and leg axes were evaluated. One-hundred and sixty-two knees were assessed through clinical examination and X-ray examination using a...
journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:10.1249/00005768-198508000-00005
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journal_title:Medicine and science in sports and exercise
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doi:10.1097/00005768-199808000-00016
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pub_type: 杂志文章,随机对照试验
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更新日期:2015-03-01 00:00:00
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pub_type: 杂志文章,评审
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journal_title:Medicine and science in sports and exercise
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journal_title:Medicine and science in sports and exercise
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更新日期:1991-04-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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doi:10.1097/00005768-200109000-00014
更新日期:2001-09-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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doi:10.1249/00005768-198512000-00007
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
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更新日期:1991-07-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章,评审
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更新日期:1991-10-01 00:00:00
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doi:10.1249/MSS.0000000000000126
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pub_type: 杂志文章
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更新日期:1991-03-01 00:00:00
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journal_title:Medicine and science in sports and exercise
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更新日期:1985-10-01 00:00:00
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更新日期:1995-11-01 00:00:00
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1995-10-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
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更新日期:1990-02-01 00:00:00
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journal_title:Medicine and science in sports and exercise
pub_type: 杂志文章
doi:
更新日期:1992-08-01 00:00:00