Cross-country skiing movement factorization to explore relationships between skiing economy and athletes' skills
(Faktorisierung der Bewegung beim Skilanglauf, um die Beziehung zwischen der Skilaufökonomie und den Fertigkeiten der Sportler)
We investigated the relationships between the biomechanics of the double poling (DP) technique in cross-country skiing, its economy and athletes skill. To this aim, skiers motion has been factorized into components through principal component analysis (PCA).Eight high-level (HL) and eight region...al level (RL) male cross-country skiers performed a 5-min submaximal DP trial while roller skiing on a treadmill at 14 km h-1 and 2° incline. Whole-body kinematics was recorded with a motion capture system. PCA was applied to markers coordinates to extract principal movements (PMk), which were ranked by their variance. Energy cost of locomotion (EC) was calculated from ergospirometric measurements.
Results showed that 96.7 ± 0.6% of total skiing pattern variance can be described with the first three PMk. (Shoulder and trunk flexion-extension are described PM1 and PM2 and elbow flexion-extension are mainly represented in PM2 and PM3. The variance of further components, consisting of residual movements (e.g., slow postural changes or high-frequency vibrations), was greater for the RL than the HL skiers (4.0 ± 0.5% vs. 2.6 ± 0.3%; p < 0.001) and was positively correlated with EC (R2 = 0.646; p < 0.001).
PCA permitted to describe the biomechanics of the DP technique through a limited set of principal movements. Skiing skills and economy appeared to be related to a skier's ability to simplify movement complexity, suggesting that an efficient skier is better able to reduce superfluous movement components during DP.
Copyright © 2018 Scandinavian Journal of Medicine & Science in Sports. Blackwell Publishing. Alle Rechte vorbehalten.
|Schlagworte:||Skilanglauf Bewegung Bewegungskoordination Energiestoffwechsel Technik Bewegungshandlung Bewegungsfertigkeit Bewegungsmerkmal Fertigkeit Leistungsfähigkeit Analyse Relation Leistungsfaktor|
|Veröffentlicht in:||Scandinavian Journal of Medicine & Science in Sports|