Inter- and Intra-Individual Variability of the Ski-Jumper's Take-Off

Some theoretical and experimental studies, e.g. [1] [4] [7] [8] [9], have considered the take-off as a key phase of the ski-jump. The transition from the in-run to the flight position determines the initial conditions of the flight phase. The dominant role of this important phase has also been confirmed during training. In contrast to the above statements, statistical analyses of the biomechanical take-off data have indicated a relatively low level dependence between the partial information of the take-off and the criterion the length of jump). In many studies, e.g. [1] [2] [3] [8] [9] [13] [17], the correlation coefficients between the biomechanical parameters describing the take-off and the length of jump have occured mainly in the interval r=0.3-0.6, with the percentage of the variability explained by the criterion being relatively low R²=0.10-0.35.