THE NON-LINEAR PHENOMENA OF A DROP-JUMP-TEST UNDER CONDITIONS OF INCREASED LOAD

Abstract

The team of research workers attempted to answer the following question: In which way do continuous and discontinuous changes of chosen kinematical, dynamical and psycho-physiological parameters occur under the conditions of increased load during a sport movement ?For our investigations we conceived a complex test under laboratory conditions. Every subject carried out a series of drop jumps on a force plate. The increased load was realised by a step by step gradual increased in the number of jumps pertime unit. The six subjects jumped for two minutes per load intensity, the breaks lasting for 4 minutes. The poster discusses the results of one subject. The time series of biomechanical, physiological and psycho-physiological parameters were determined. The time series of ground reaction forces, cardiac rhythms and reaction time were analysed. For a quantitative analysis of the change in these parameters we used the correlation dimension according to GRASSBERGER/PROCACCIA (1984). The results found out that the correlation dimension of these quantities increase with higher loads.