INTRODUCTION: In a previous work it has been demonstrated how the increasing of the gradient will lead to a significant changes in the parameters that characterize poling action of diagonal stride of roller skiing on a treadmill. The aim of this work is to study if these changes are gender related. METHOD: 5 male and 12 female members of the Italian cross-country ski team were requested to ski with roller skis on a treadmill at constant speed (10km/h for M and 9km/h for F) using diagonal stride. Treadmill slope was increased of 1° every 3min from 2° until 8°. Total power Output P was calculated from slope, roller friction and speed. Poling force was measured by means of load cells rnounted on the poles and pole inclination was determined by a motion capture system. For each grade, cycle time (CT), duty cycle (DC), total (PF) and parallel (pPF) poling force averaged over the cycle, pole inclination at the beginning of poling phase, poling power PP and ration between poling power and power output pP/P were calculated. In order to better underline Variation across grades, the perceptual Variation for each grade respect to the values found a 2° were then calculated for each parameters. Differences between gender were assessed by means of a 2-way (sex and slope) ANOVA RESULTS and DISCUSSION: A significant and linear increase with slope for DC, PF, pPF, vel and PP has been seen for both F and M. On the contrary, a decrease of pole inclination and PP/P ratio has been calculated. Differences between gender have been detected for inc, hF, pP with greater variations for female group. On the contrary, decrease of pP/P is greater for male skiers. Values at lower grade and Variation at higher grade are reported While similar Variation has been found for cycle time and force, it has been seen that female athletes have a higher rate of poling power increment. This could be related to both an higher Variation of pole inclination, that leads at a higher increment of parallel force component and duty cycle, parameters that indeed play a role in power resultant. CONCLUSION: The increment in the requested power Output has been sustained by male and female athletes adopting two different strategies. As female athletes appear able to greater increment of propulsive power with equal increment of force, their strategy to sustain power output increment seem to be more efficient.
© Copyright 2007 4th International Congress on Science and Skiing. Julkaistu Tekijä University of Salzburg. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator