DIFFERENCES BETWEEN JUMPS ON HARD AND ELASTIC SURFACES

Abstract

The purpose of the present study was to analyze differences of jumps under several conditions. A measuring unit with two dynamometric platforms and a synchronized highspeed video was used. One platform was prepared with a special elastic element of elastic swing floor. Participants were 160 sport students (72 male, 88 female). Tasks were counter movement jumps and drop jumps. In this group 12 students (5 male, 7 female) performed the test program with additional EMG signal recording. The results showed that the contact time and the height of jumps were significantly differentiated between the performances on the hard and the elastic surfaces. On the special elastic surface the contact time was shorter and both types of jumps were higher. In addition, the ground reaction force and the EMG activity were different under the two conditions.