ANALYSIS OF CORRELATION BETWEEN SELECTED KINEMATIC VARIABLES OF THE TAKE-OFF AND THE LENGHT OF THE SKI-JUMP

  • Bojan Jost
  • Milan Coh
  • Pustovrh Janez
Keywords: ski jumps, kinematics, take-off analysis, World Cup Competition, Planica K 180 m

Abstract

The objective of the study was to establish, by means of 2-D kinematic analysis, the correlation between 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). Analysis of correlation and single-factor analysis of variance were used. A smaller number of statistically significant correlations between the defined kinematic variables and the jump length was determined. The differences in the vertical velocity of the take-off on the edge of the take-off platform confirmed a tendency towards positive correlations 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).
Section
Coaching and Sports Activities