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Repeated double-poling sprint training in hypoxia by competitive cross-country skiers
Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland.
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (NVC)
Department of Sport Science, University of Wuppertal, Wuppertal, Germany.
Department of Sport Science, University of Wuppertal, Wuppertal, Germany.
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2015 (English)In: Medicine & Science in Sports & Exercise, ISSN 0195-9131, E-ISSN 1530-0315, Vol. 47, no 4, 809-817 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: Repeated-sprint training in hypoxia (RSH) was recently shown to improve repeated-sprint ability (RSA) in cycling. This phenomenon is likely to reflect fiber type-dependent, compensatory vasodilation, and therefore, our hypothesis was that RSH is even more beneficial for activities involving upper body muscles, such as double poling during cross-country skiing. Methods: In a double-blinded fashion, 17 competitive cross-country skiers performed six sessions of repeated sprints (each consisting of four sets of five 10-s sprints, with 20-s intervals of recovery) either in normoxia (RSN, 300 m; FiO2, 20.9%; n = 8) or normobaric hypoxia (RSH, 3000 m; FiO2, 13.8 %; n = 9). Before (pre) and after (post) training, performance was evaluated with an RSA test (10-s all-out sprints-20-s recovery, until peak power output declined by 30%) and a simulated team sprint (team sprint, 3×3-min all-out with 3-min rest) on a double-poling ergometer. Triceps brachii oxygenation was measured by near-infrared spectroscopy. Results: From pretraining to posttraining, peak power output in the RSA was increased (P < 0.01) to the same extent (29% ± 13% vs 26% ± 18%, nonsignificant) in RSH and in RSN whereas the number of sprints performed was enhanced in RSH (10.9 ± 5.2 vs 17.1 ± 6.8, P < 0.01) but not in RSN (11.6 T 5.3 vs 11.7 ± 4.3, nonsignificant). In addition, the amplitude in total hemoglobin variations during sprints throughout RSA rose more in RSH (P < 0.01). Similarly, the average power output during all team sprints improved by 11% T 9% in RSH and 15% T 7% in RSN. Conclusions: Our findings reveal greater improvement in the performance of repeated double-poling sprints, together with larger variations in the perfusion of upper body muscles in RSH compared with those in RSN. © 2014 by the American College of Sports Medicine.

Place, publisher, year, edition, pages
2015. Vol. 47, no 4, 809-817 p.
Keyword [en]
altitude training, cross-country ski, performance, repeated sprints
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-25809DOI: 10.1249/MSS.0000000000000464ISI: 000351587800017Scopus ID: 2-s2.0-84925605618OAI: oai:DiVA.org:miun-25809DiVA: diva2:852797
Note

Export Date: 28 August 2015

Available from: 2015-09-10 Created: 2015-08-28 Last updated: 2016-09-22Bibliographically approved

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