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A comparison of mechanical parameters between the counter movement jump and drop jump in Biathletes

100%

Król H. , Mynarski W.

Journal of Human Kinetics

2012

tom 34

nr 1

59-68

The main objective of the study was to determine to what degree higher muscular activity, achieved by increased load in the extension phase (eccentric muscle action) of the vertical jump, affects the efficiency of the vertical jump. Sixteen elite biathletes participated in this investigation. The biathletes performed tests that consisted of five, single “maximal” vertical jumps (counter movement jump - CMJ) and five, single vertical jumps, in which the task was to touch a bar placed over the jumping biathletes (specific task counter movement jump - SCMJ). Then, they performed five, single drop jumps from an elevation of 0.4m (DJ). Ground reaction forces were registered using the KISTLER 9182C force platform. MVJ software was used for signal processing (Król, 1999) and enabling calculations for kinematic and kinetic parameters of the subject’s jump movements (on-line system). The results indicate that only height of the jump (h) and mean power (Pmean) during the takeoff are statistically significant. Both h and Pmean are higher in the DJ. The results of this study may indicate that elite biathletes are well adapted to eccentric work of the lower limbs, thus reaching greater values of power during the drop jump. These neuromuscular adaptive changes may allow for a more dynamic and efficient running technique.

The Complex Analysis of Movement in the Evaluation of the Backward Somersault Performance

80%

Król H. , Klyszcz-Morciniec M. , Sobota G. , Nowak K.

Physical Activity Review

2016

tom 4

28-39

Complex methodology was applied to study a movement structure in the standing back tuck somersault (SBTS). We have checked the usefulness of the multi-modular measuring system (SMART-E, BTS, Company, Italy) consisting of six infrared cameras, and the wireless module Pocket EMG, for measuring muscle bioelectric activity and force plate (AMTI, USA). Software Smart Analyser was used to create a database allowing the chosen parameters to be compared. Using a comprehensive methodology in the studies of the back somersault, performed with the landing at the same place (salto – S), allows for the presentation of the external and internal structure of the movement of this exercise.