INTRODUCTION: The purpose of the investigation was to develop a set of instrumented skirolls enabling to measure the loading patterns developed by elite athletes during field tests on skating and classic skirolls. The vertical and lateral loads magnitudes and the COP trajectory under the feet during the push phase can be precisely evaluated together with the skiroll orientation: these data, combined with the poles push loads (Millet et al.,1998), can give a clear quantitative evaluation of the athlete's technique, The instrumented skiroll can therefore work as a training evaluation device that allows to correlate the foot loads with the metabolic and the EMG activity (Millet et al., 2002). METHOD: A portable data acquisition unit IMC Cronos PL3 was used for data collection in the field. The unit allows to measure 8 channels at 20 kHz sampling rate. A pair of skating skiroll and a pair of classic skiroll were instrumented with strain gauge bridges at the two extremities and calibrated in a test bench at the DolomitiCert Laboratory. Four channels on each skating skiroll enabled to evaluate the following loads: the force FN {normal to the foot sole) and its Centre of Pressure COP along the ski; the lateral forces FLA and FLP respectively at the front and rear wheels. After the application of two inertial platforms X-sense Mti to the skirolls, also the synchronous recorded orientation of the skiroll can be recorded. Two elite athletes (E1.E2) and two experienced amateurs (A1, A2) were involved in the tests on flat and uphill tarmac roads. RESULTS and DISCUSSION: The normal force FN Signals were plotted versus the COP Position in order to show the different skating and classic loading patterns of each testers (Figure 1 .a). The average normal force FN Signals of the four testers were normalized to the Body Weight and plotted versus the normalized time scale showing clear differences between the elite and the amateur athletes (Figure 1.b} in terms of magnitude and shape of the plot of the foot normal force FN. CONCLUSION: The work resulted in the development of a set of instrumented skirolls suitable for measuring the foot loads during an athlete's functional performance and biomechanical evaluation.
© Copyright 2007 4th International Congress on Science and Skiing. Julkaistu Tekijä University of Salzburg. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator