INTRODUCTION: In a cross-country (CC) skiing competition, a V2 skate technique (V2) has in recent years become more widely applied on uphill terrain, where V1 skate technique typically was used with the appearance of the sprint race. Skiers perform one double pole stroke on each leg push-off in a V2. The purpose of this study was to examine the influence of an inclination on a V2 motion. METHOD: One CC skier (woman, age 23 yr, height 159 cm, weight 57 kg) volunteered as a subject in the study. The measurements on roller skis on a treadmill (length of 3.1m, width of 1.8m) with different inclination and a velocity of 5 ms-1 were carried out. The subject performed V2 a minimum of 60 seconds under five uphill conditions (3, 5, 7, 9 and 11%). In-shoe foot plantar pressures of the ball of the big toe were measured with a force sensor, of which were sampled at a rate of 500Hz. The motions were analyzed by a three-dimensional cinematographic technique (60fps). We measured the following four items: the time used for one cycle, the time used for one slide, the impulse in each slide, and the ski-opening angle between skis in one cycle (V angle). All data was evaluated by means of one-way ANOVA and a multiple comparisons method. RESULTS: There was no significant difference in the time used for one cycle, the time used for one slide, and the impulse in each slide. However, the V angle increased as the inclination of treadmill increased (Figure 1). There were statistical differences between V angle at an inclination of 3% and those at inclinations of 9 and 11% (p<0.05). DISCUSSION: It was determined that the Increase of the V angle of skis with increasing of the inclination of treadmill enlarged a propulsion component. We also speculated that the subject gained propulsion by pole-push as an inclination increased. CONCLUSION: The changes of motion of a V2 skate were measured on roller skis with increasing of inclination of treadmill by the motion analysis and the measurement of plantar pressure. According to the results, the skier enlarged the degree of V angle of skis as the inclination increased. The measurement of poling force should be a focus of research in the future.
© Copyright 2007 4th International Congress on Science and Skiing. Julkaistu Tekijä University of Salzburg. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator