Kineziologija, Vol. 29 No. 1, 1997.
Izvorni znanstveni članak
Analysis of kinematic variables and their relation to the performance of ski jumpers at the world championship in ski flights at Planica in 1994
Bojan Jošt
; Faculty of Sport, University of Ljubljana, Slovenia
Otmar Kugovnik
; Faculty of Sport, University of Ljubljana, Slovenia
Vojko Strojnik
; Faculty of Sport, University of Ljubljana, Slovenia
Istok Colja
; Faculty of Sport, University of Ljubljana, Slovenia
Sažetak
The objective of this study has been to establish on a sample of the best ski jumpers (n=28) participating in the World Championship in ski flights at Planica in 1994 (K=180 m) by means of a 3-D kinematic analysis the relation between the selected kinematic parameters of the jump of a ski jumper and his performance from the aspect of the flight length. By means of correlation analysis and univariate factor analysis of variance, some statistically significant relations of the kinematic variables to the length of the jump (p<.05) were established. The most important predictor of a successful jump was the angle of elevation in the middle part of the jump (r = -.78). The results have also shown that in order to achieve a high performance level from the aspect of the length a ski jumper must maximize the resultant of the speed of movement of the body’s centre of gravity in the first part of the flight; maximize the horizontal component of the speed of movement of the body’s centre of gravity during the entire flight and in particular in the first part of the flight; decrease the angle between the longitudinal and horizontal axis of the body, above all in the middle part of flight; decrease the angle between the longitudinal axis of the body and the skis in all phases of the flight; optimize the angle between the longitudinal axis of the upperpart of the body and the skis in the take-off phase and minimize it in the middle part of the flight, where this requirement is combined with the requirement for the minimization of the angle between the skis and the horizontal.
Ključne riječi
ski flights, kinematic variables, analysis, performance
Hrčak ID:
255891
URI
Datum izdavanja:
15.4.1997.
Posjeta: 474 *