Document Detail


Control of speed during the double poling technique performed by elite cross-country skiers.
MedLine Citation:
PMID:  19092686     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Double poling (DP) as a main technique in cross-country skiing has developed substantially over the last 15 yr. The purpose of the present study was to analyze the question, "How do modern elite skiers control DP speed?" METHODS: Twelve male elite cross-country skiers roller skied using DP at 9, 15, 21, and 27 km.h(-1) and maximum velocity (V(max)). Cycle characteristics, pole and plantar forces, and elbow, hip, and knee joint angles were analyzed. RESULT: Both poling frequency and cycle length increased up to 27 km.h (-1)(P < 0.05), with a further increase in poling frequency at V(max) (P < 0.05). Peak pole force, rate of force development, and rearfoot plantar force increased with submaximal velocities (V(sm)), whereas poling time and time-to-peak pole force gradually shortened (P < 0.05). Changes in elbow joint kinematics during the poling phase were characterized by a decreased angle minimum and an increased flexion and extension ranges of motion as well as angular velocities across V(sm) (P < 0.05), with no further changes at V(max). Hip and knee joint kinematics adapted across V(sm) by 1) decreasing angles at pole plant and angle minima during the poling phase, 2) increasing the ranges of motion and angular velocities during the flexion phases occurring around pole plant, and 3) increasing extension ranges of motion and angular velocities during the recovery phase (all P values <0.05), with no further changes at V(max). CONCLUSIONS: Elite skiers control DP speed by increasing both poling frequency and cycle length; the latter is achieved by increased pole force despite reduced poling time. Adaptation to higher speeds was assisted by an increased range of motion, smaller angle minima, and higher angular velocities in the elbow, the hip, and the knee joints.
Authors:
Stefan Josef Lindinger; Thomas Stöggl; Erich Müller; Hans-Christer Holmberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  41     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-24     Completed Date:  2009-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  210-20     Citation Subset:  IM; S    
Affiliation:
Department of Sport Science and Kinesiology, Christian Doppler Laboratory-Biomechanics in Skiing, University of Salzburg, Rifer Schlossallee 49, Hallein, Salzburg, Austria. stefan.lindinger@sbg.ac.at
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MeSH Terms
Descriptor/Qualifier:
Adult
Athletic Performance / physiology*
Biomechanics
Exercise Test
Hip Joint / physiology*
Humans
Knee Joint / physiology*
Male
Muscle Strength / physiology*
Posture / physiology
Skiing / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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