Jo?t, Bojan; ?oh, Milan; Pustovrh, Janez; Ulaga, Maja - Analysis of selected kinematic variables of the take-off in ski jumps in the finals of the World Cup '99 at Planica

摘要

The objective of the study was to establish, by means of a 2-D kinematic analysis, the correlation between the selected kinematic parameters of the take-off of the jumpers and their performance from the aspect of the jump length, on a sample of the best ski jumpers (first series n = 42; second series n = 30) participating in the final competition of the World Cup in Ski Flights at Planica in 1999 (K 180 m). By means of an analysis of correlation and single-factor analysis of variance, a smaller number of statistically significant correlations between the defined kinematic variables and the jump length was obtained. The differences in the vertical velocity of the takeoff on the edge of the take-off platform confirmed a tendency towards positive correlation between this variable and the jump length (the group of the best ski jumpers attained the smallest vertical velocity in both jumps; in the first jump, the differences between the various quality groups of ski jumpers were statistically significant. The best group of ski jumpers showed tendencies towards a more pronounced transfer of the hips and the common centre of gravity in the forward direction (the take-off rotation factor) relative to the axis of the ankle (the differences between the various quality groups of ski jumpers were statistically significant in the second jump).