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Forward acceleration of the centre of mass during ski skating calculated from force and motion capture data
AuthorGöpfert, Caroline ; Pohjola, Mikko V. ; Linnamo, Vesa ; Ohtonen, Olli ; Rapp, Walter ; Lindinger, Stefan J.
Published in
Sports Engineering, Berlin, 2016, Vol. 2016, page 1-13
PublishedSpringer, 2016
Document typeJournal Article
Keywords (EN)Cross-country skiing / Propulsion / 3D motion analysis / System acceleration / Centre of mass
URNurn:nbn:at:at-ubs:3-1966 Persistent Identifier (URN)
 The work is publicly available
Forward acceleration of the centre of mass during ski skating calculated from force and motion capture data [1.29 mb]
Abstract (English)

The purpose of this paper was to present and evaluate a methodology to determine the contribution of bilateral leg and pole thrusts to forward acceleration of the centre of mass (COM) of cross-country skiers from multidimensional ground reaction forces and motion capture data. Nine highly skilled cross-country (XC) skiers performed

leg skating and V2-alternate skating (V2A) under constant environmental conditions on snow, while ground reaction forces measured from ski bindings and poles and 3D motion with high-speed cameras were captured. COM acceleration determined from 3D motion analyses served as a reference and was compared to the results of the

proposed methodology. The obtained values did not differ during the leg skating push-off, and forcetime curves showed high similarity, with similarity coefficients (SC)[0.90 in the push-off and gliding phases. In V2A, leg and pole thrusts were shown to contribute 35.1 and 65.9% to the acceleration of the body, respectively. COM acceleration derived from ground reaction forces alone without

considering the COM position overestimated the acceleration compared to data from motion analyses, with a mean difference of 17% (P\0.05) during leg push-off, although the shapes of forcetime curves were similar (SC = 0.93). The proposed methodology was shown to be appropriate for determining the acceleration of XC skiers during leg skating push-off from multi-dimensional ground reaction forces and the COM position. It was demonstrated that both the COM position and ground reaction forces are needed to find the source of acceleration.

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