BODY SWAY IN BIATLON SHOOTING

Abstract

In the 7.5 hi sprint biathlon event each competitor skis 7.5 kilometres. stopping Two times during the race to fire shots into a target. A miss means handicap circuit added to the distance charged to the skier while: completing the distance of competition. The race is capable to test the strength, endurance and skill of competitors. In biathlon shooting. two positional rules apply. ?'hey are standing-and prone (lying flat on the ground). Before the shooting. the cross-country racing loads extremely the cardio-respiratory and neuro-muscular system. In shooting. the oscillation amplitudes of body segments depend on the degree of optimalization in diminishing of' running velocity. immediately before the shooting without significant loss of time. The aim of the present study is the investigation of body sway in model-situation. in our experiments the representative biathlon tearn of Hungary. seven subjects (age: 16-28 years) as well as university students (eight subjects) have been tested. The equipment we used include microcomputer and a personal computer as well as a force platform. Two types of programs have been used for the measurements to study the movement coordination skill and the maintaining of equilibrium. The classic Romberg tests have been completed with measurements of the Equilibrium and displacement of centre of subjects in shooting position. Excerpts of results i20 s test/: traditional Romberg tests: R1 - 3 111111. 122 - 3 111111. It3 - 4 n111i ... (open eyes) R 1 - 3 tiitii. K2 - 3 timi. 113 -:6- Inn1 ... (closed eyes) Dominant frequencies in Fourier power spectra: lateral direction: !). 1 - 0.15 - 0.4 - 0.7 I IL anteroposterior direction: 0.05 - 0-25 - 0.7 1 IL (Open eyes. subject No. 2) The result verify premises concerning the balancing ability and stability of biathlon competitors.