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Using the power balance model to simulate cross-country skiing on varying terrain

Authors Moxnes JF, Sandbakk, Hausken K

Received 24 August 2013

Accepted for publication 17 October 2013

Published 7 May 2014 Volume 2014:5 Pages 89—98


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

John F Moxnes,1 Øyvind Sandbakk,2 Kjell Hausken3

1Department for Protection, Norwegian Defence Research Establishment, Kjeller, Norway; 2Center for Elite Sports Research, Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway; 3Faculty of Social Sciences, University of Stavanger, Stavanger, Norway

Abstract: The current study adapts the power balance model to simulate cross-country skiing on varying terrain. We assumed that the skier’s locomotive power at a self-chosen pace is a function of speed, which is impacted by friction, incline, air drag, and mass. An elite male skier’s position along the track during ski skating was simulated and compared with his experimental data. As input values in the model, air drag and friction were estimated from the literature based on the skier's mass, snow conditions, and speed. We regard the fit as good, since the difference in racing time between simulations and measurements was 2 seconds of the 815 seconds racing time, with acceptable fit both in uphill and downhill terrain. Using this model, we estimated the influence of changes in various factors such as air drag, friction, and body mass on performance. In conclusion, the power balance model with locomotive power as a function of speed was found to be a valid tool for analyzing performance in cross-country skiing.

Keywords: air drag, efficiency, friction coefficient, speed, locomotive power

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