THE CHANGES WITHIN COORDINATION STRUCTURE OF ATHLETES' MOVEMENTS AT VARIOUS CONDITIONS OF GRAVITATION INTERACTIONS

  • A. Laputin
  • I.V. Khmelnitskaya

Abstract

INTRODUCTION - The changes within coordination structure of athletes' complex motions under simulation of various conditions of gravitation interactions were studied at the experiment. Motion actions of basketballers who performed the throw into basket at jumping: under natural conditions A; under condition B - with weights being positioned on the body so that the geometry of athletes' body masses to keep with the man; under condition C - with weight placed locally on the body (waistcoat) were controlled by the using of videocomputer analysis, the tensodynamography. RESULTS - The characteristics of vertical component of supporting response as well as the kinematic parameters were registered. Computed t-statistics about the time of the achieving of supporting response' maximum vertical component plus the time of the taking off platform Tmax + Tt for compared samples A and B is -2.3128 at significance level 0.0231, for samples A and C is -1.0704 at significance level 0.2874. Computed t-statistics about the gradient of supporting response' vertical component F'(t) for compared samples A and B is 2.1351 at significance level 0.0355, for samples A and C is 0.4043 at significance level 0.6870. Computed t-statistics about the impulse of supporting response' vertical component I F(t)dt for compared samples A and B is - 3.5362 at significance level 6.5E4, for samples A and C is -1.4528 at significance level 0.1498. Computed t-statistics about the total time of the jump Tsum for compared samples A and B is -1.2286 a significance level 0.2225, for samples / and C is -0.0218 at significance level 0.0986. The results of hypothesis test for Ho about the differences=O (at Alpha=O 05 between these statistical samples each b! number of observations equal of 4! showed: I) the hypothesis Ho is not rejected , the differences equal 0 at the comparison between samples of condition A and B; 2) the hypothesis Ho is rejected , the differences are not equal 0 at the comparison between samples of condition A and C. CONCLUSION - The experiments proved the weights being positioned so that the geometry of body mass to keep did not influence essentially onto kinematic structure of throw technique. At the same time the weight of the same mass that is fixed locally on the body cause: pronounced changes within the coordination structure of the throw particularly with the time. Experiments showed the positioning of weights at the keeping of masses’ geometry allows to create for examinees the artificial gravitational surround adequate with a motional tasks and so gives the possibility to increase essentially their power potential and to improve greatly the coordination of motions during sport exercises.