Pole Length’s Influence on Performance During Classic-Style Snow Skiing in Well-Trained Cross-Country Skiers
| Autor: | Erik Trøen, Øyvind Karlsson, Camilla Høivik Carlsen, Matthias Gilgien, Ola Kristoffer Tosterud, Thomas Losnegard, Gøran Paulsen, Bjarne Rud |
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| Rok vydání: | 2020 |
| Předmět: |
Male
Body height Physical Exertion Physical Therapy Sports Therapy and Rehabilitation Athletic Performance 030204 cardiovascular system & hematology Sports Equipment Young Adult 03 medical and health sciences Sex Factors 0302 clinical medicine Animal science Time trial Heart Rate Skiing Snow Task Performance and Analysis Heart rate Humans Orthopedics and Sports Medicine Mathematics Rating of perceived exertion Cross country 030229 sport sciences Body Height Confidence interval Improved performance Motor Skills Female Perception |
| Zdroj: | International Journal of Sports Physiology and Performance. 15:884-891 |
| ISSN: | 1555-0273 1555-0265 |
| DOI: | 10.1123/ijspp.2019-0310 |
| Popis: | Purpose: To investigate how self-selected pole length (PL) of ∼84% (PL84%) compared with ∼90% (PL90%) of body height influenced performance during a 700-m time trial with undulating terrain on snow. Methods: Twenty-one cross-country skiers, 7 of whom were women, performed 4 trials at a maximal effort in a counterbalanced fashion with PL84% and PL90% separated by 20-minute breaks between trials. In trials I and II, only double poling was allowed, while in trials III and IV, skiers used self-selected classical subtechniques. Continuous speed, cyclic parameters, and heart rate were collected using microsensors in addition to a post-time-trial rating of perceived exertion (RPE). Results: The 700-m times with only double poling were significantly shorter with PL90% than PL84% (mean ± 95% confidence limits –1.6% ± 1.0%). Segment analyses showed higher speed with PL90% in uphill sections than with PL84% (3.7% ± 2.1%), with the greatest difference found for the female skiers (5.6% ± 2.9%). In contrast, on flat terrain at high skiing speeds, speed was reduced with PL90% compared with PL84% (–1.5% ± 1.4%); this was only significant for the male skiers. During free choice of classical subtechniques, PL did not influence performance in any segments, choice of subtechnique, or cycle rate during the trials. No differences in rating of perceived exertion or heart rate between PLs were found. Conclusions: PL90% improved performance in uphills at low speeds when using double poling but hindered performance on flat terrain and at higher speeds compared with self-selected PLs. Choice of PL should, therefore, be based on racecourse topography, preferred subtechniques, and the skier’s physiological and technical abilities. |
| Databáze: | OpenAIRE |
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