The purpose of this study is to clarify the advantages and disadvantages of acceleration measurements in cross country skiing using a body mounted kinematical inertial measurement system. A high profile world cup athlete performed two test-runs in diagonal stride technique on skis and roller skies equipped with an inertial measurement system. In particular the acceleration of the athlete`s centre of gravity in skiing direction is of interest with respect to the efficiency of the skiing technique. Significant differences are found between skiing and roller skiing. The main benefit of inertial measurement systems can be seen in the application in field for the measurement of complete test-runs. The weight and the mechanical characteristics of the measuring system might slightly affect an athlete adversely.
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