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Validation of physiological tests in relation to competitive performances in elite male distance cross-country skiing
Högskolan Dalarna, Akademin Utbildning, hälsa och samhälle, Idrotts- och hälsovetenskap.
Högskolan Dalarna, Akademin Utbildning, hälsa och samhälle, Idrotts- och hälsovetenskap.ORCID-id: 0000-0002-7178-5357
Högskolan Dalarna, Akademin Utbildning, hälsa och samhälle, Idrotts- och hälsovetenskap.ORCID-id: 0000-0001-8360-2100
Vise andre og tillknytning
2012 (engelsk)Inngår i: Journal of Strength and Conditioning Research, ISSN 1064-8011, E-ISSN 1533-4287, Vol. 26, nr 6, s. 1496-1504Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The purpose of the present study was to establish which physiological test parameters reflects the distance performances in the Swedish National Championships in cross-country skiing (SNC) and the International Ski Federation's ranking points for distance performances (FISdist). The present study also aimed to create multiple regression models to describe skiing performance for the SNC distance races and International Ski Federation's (FIS) ranking. Twelve male, Swedish, national elite, cross-country skiers (maximal oxygen consumption [(V) over dotO(2)max] = 5.34 +/- 0.34 L.min(-1)) volunteered to participate in the study. Their results in the 2008 SNC (15 km race [SNC15] and 30 km race [SNC30]) and FISdist points were used as performance data. On the week preceding the Championship, subjects completed a test battery consisting of 7 physiological tests: isokinetic knee extension peak torque (PT), vertical jumps (VJ), lactate threshold (LT), (V) over dotO(2)max, and 3 double poling tests of different durations (DP20, DP60, and DP360). Correlations were established using Pearson's correlation analysis, and models to describe skiing performance were created using standard multiple linear regression analysis. Significant correlations were found between the performance parameters and test parameters derived from LT, (V) over dotO(2)max, and DP60 tests. No correlations with any performance parameter were found for PT, VJ, DP20, and DP360 tests. For FISdist and SNC15, the models explain 81% and 78% of the variance in performance, respectively. No statistically valid regression model was found for SNC30. The results of this study imply that the physiological demands in male elite distance cross-country skiing performances are different in different events. To adequately evaluate a skier's performance ability in distance cross-country skiing, it is necessary to use test parameters and regression models that reflect the specific performance.

sted, utgiver, år, opplag, sider
National Strength and Conditioning Association , 2012. Vol. 26, nr 6, s. 1496-1504
Emneord [en]
(V) over dotO(2)max, double poling, lactate threshold, regression models, ski ranking
HSV kategori
Forskningsprogram
Hälsa och välfärd
Identifikatorer
URN: urn:nbn:se:du-10236DOI: 10.1519/JSC.0b013e318231a799ISI: 000304363900007OAI: oai:DiVA.org:du-10236DiVA, id: diva2:537824
Tilgjengelig fra: 2012-06-27 Laget: 2012-06-27 Sist oppdatert: 2017-12-07bibliografisk kontrollert
Inngår i avhandling
1. Physiological demands of competitive elite cross-country skiing
Åpne denne publikasjonen i ny fane eller vindu >>Physiological demands of competitive elite cross-country skiing
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Introduction Researchers have, for decades, contributed to an increased collective understanding of the physiological demands in cross-country skiing; however, almost all of these studies have used either non-elite subjects and/or performances that emulate cross-country skiing. To establish the physiological demands of cross-country skiing, it is important to relate the investigated physiological variables to the competitive performance of elite skiers. The overall aim of this doctoral thesis was, therefore, to investigate the external validity of physiological test variables to determine the physiological demands in competitive elite cross-country skiing.

Methods The subjects in Study I – IV were elite male (I – III) and female (III – IV) cross-country skiers. In all studies, the relationship between test variables (general and ski-specific) and competitive performances (i.e. the results from competitions or the overall ski-ranking points of the International Ski Federation (FIS) for sprint (FISsprint) and distance (FISdist) races) were analysed. Test variables reflecting the subject’s general strength, upper-body and whole-body oxygen uptake, oxygen uptake and work intensity at the lactate threshold, mean upper-body power, lean mass, and maximal double-poling speed were investigated.

Results The ability to maintain a high work rate without accumulating lactate is an indicator of distance performance, independent of sex (I, IV). Independent of sex, high oxygen uptake in whole-body and upper-body exercise was important for both sprint (II, IV) and distance (I, IV) performance. The maximal double-poling speed and 60-s double-poling mean power output were indicators of sprint (IV) and distance performance (I), respectively. Lean mass was correlated with distance performance for women (III), whereas correlations were found between lean mass and sprint performance among both male and female skiers (III). Moreover, no correlations between distance performance and test variables were derived from tests of knee-extension peak torque, vertical jumps, or double poling on a ski-ergometer with 20-s and 360-s durations (I), whereas gross efficiency while treadmill roller skiing showed no correlation with either distance or sprint performance in cross-country skiing (IV).

Conclusion The results in this thesis show that, depending on discipline and sex, maximal and peak oxygen uptake, work intensity at the lactate threshold, lean mass, double-poling mean power output, and double-poling maximal speed are all externally valid physiological test variables for evaluation of performance capability among elite cross-country skiers; however, to optimally indicate performance capability different test-variable expressions should be used; in general, the absolute expression appears to be a better indicator of competitive sprint performance whereas the influence of body mass should be considered when evaluating competitive distance performance capability of elite cross-country skiers.

sted, utgiver, år, opplag, sider
Umeå: Umeå University, 2015. s. 46
Serie
Umeå University medical dissertations, ISSN 0346-6612 ; 1713
Emneord
Performance capability, maximal oxygen uptake, lactate threshold, lean mass, double poling, power output, maximal speed, sprint skiing, distance skiing.
HSV kategori
Forskningsprogram
Hälsa och välfärd
Identifikatorer
urn:nbn:se:du-20624 (URN)978-91-7601-269-7 (ISBN)
Disputas
2015-06-05, Föreläsningssal 6, Högskolegatan 2, 79188, 09:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2016-01-07 Laget: 2016-01-07 Sist oppdatert: 2017-10-12bibliografisk kontrollert

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