233 KB0 KB200520252018Jošt, Bojanštevilka:3/4letnik:66str. 129-135ISSN:0353-7455COBISSID:5457585URN:URN:NBN:SI:doc-24WETIP5slFakulteta za športŠport (Ljubljana)odrivna močsmučarski skokitestiranjezimski športiStruktura povezanosti spremenljivk izometrične in dinamične odrivne moči smučarjev skakalcev|The purpose of the research study was to establish the structure of correlations among the selected variables of ski jumpers' isometric and dynamic push-off power. Both types affect the realisation of ski jumpers' push-off power. The sample consisted of 46 Slovenian ski jumpers, aged between 16 and 19. The study subjects first carried out a vertical take-off on a standard force plate, during which variables of dynamic push-off power were measured (i.e. push-off velocity, push-off acceleration, push-off acceleration in the first half of the push-off time, push-off acceleration in the second half of the push-off time). The isometric push-off power was tested with a special measuring device which is used to determine thrust force in a squatting position. A situation in the first phase of muscle tension at 0.2 sec was established, along with maximum isometric force. Correlations among push-off power variables were high and statistically significant. A similar situation was also established in manifest correlations among isometric power variables. Using a factor analysis component, three significant factors were ruled out (eigenvalue was higher than 1). Projections of push-off acceleration were predominant in the first factor of dynamic push-off power. In the second factor of maximum isometric push-off power, two variables of maximum thrust force prevailed. The third factor was determined by projections of isometric thrust power in the initial push-off phase. A statistically significant correlation (r = .33, p= 0.05) was established between the second and third factors. Based on the study results it is possible to confirm the hypothesis that the dynamic and isometric components of the push-off power are mainly independentNamen raziskovalne študije je bil ugotoviti strukturo povezanosti med izbranimi spremenljivkami izometrične in dinamične odrivne moči smučarjev skakalcev. Obe obliki moči vplivata na uspešnosti realizacije odrivne moči smučarjev skakalcev. V raziskavi je sodelovalo 46 slovenskih smučarjev skakalcev, starih od 16 do 19 let. Merjenci so najprej izvedli vertikalni odskok na standardni tenziometrični plošči, pri čemer so bile izmerjene spremenljivke dinamične odrivne moči (hitrost odriva, pospešek odriva, pospešek odriva v prvi polovici časa odriva, pospešek odriva v drugi polovici časa odriva). Izometrična odrivna moč je bil testirana na posebni merilni aparaturi za ugotavljanje potisne sile v počepu. Ugotovljeno je bilo stanje v prvi fazi mišičnega naprezanja v času 0,2 sek. in maksimalna izometrična sila. Korelacije spremenljivk dinamične odrivne moči so bile visoke in statistično značilne. Podobno stanje je bilo ugotovljeno tudi pri manifestni korelacijski povezanosti spremenljivk izometrične moči. S pomočjo komponente faktorske analize so bili izločeni trije značilni faktorji (lastna vrednost je bila večja od 1). Na prvem faktorju dinamične odrivne moči so dominirale projekcije odrivnih pospeškov. Na drugem faktorju maksimalne izometrične odrivne moči sta prevladovali spremenljivki maksimalne potisne sile. Tretji faktor so določale projekcije izometrične potisne moči v začetni fazi odriva. Med drugim in tretjim faktorjem je bila ugotovljena značilna medsebojna povezanost (r = .33, p = 0,05). Na podlagi rezultatov raziskave je moč potrditi hipotezo, da sta dinamična in izometrična komponenta odrivne moči v veliki meri med seboj neodvisniTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za šport