Povezanost modulacije refleksa H pri prehodu iz leže v stojo in mejami stabilnosti v stoji pri baletnih plesalcih : diplomsko delo

Lešnik, Tjaša (author), Tomažin, Katja (mentor)

Da bi ugotovili povezanost modulacije refleksa H in mej stabilnosti pri baletnih plesalcih, smo izmerili amplitudo refleksa H in izvedli štirismerni test mej stabilnosti. Refleks H je bil izmerjen osmim profesionalnim baletnim plesalcem, aktivnim članom baletnega ansambla Slovenskega narodnega gledališča Ljubljana in Maribor (1 moški in 7 žensk, povprečna starost: 25±4,2 let, povprečna višina: 169,25±5,4 cm in povprečna teža: 56,45± 10,1 kg). Vsi merjenci so zaključili najmanj 10 let plesnega izobraževanja. Refleks H je bil izmerjen v 3 pogojih; v leži, dvonožni stoji in enonožni stoji. Rezultati so pokazali, da je bilo razmerje največji val H/val M v bipedalni in unipedalni stoji nižje kot v leži. Razmerje največji val H/ val M se je pri prehodu iz leže v bipedalno stojo znižalo za 53,3±22,6 % (P<0,001) glede na ležo, v unipedalni stoji pa je bilo razmerje za 45,2±26,1 % (P<0,001) nižje kot v leži. Do znižanja modulacije refleksa H je prišlo zaradi predsinaptične inhibicije. Med merjenimi spremenljivkami testa mej stabilnosti giba smo negativno povezavo ugotovili le s spremenljivko največji kot nagiba telesa v vseh štirih smereh. Zgleda, da modulacija refleksa H v bipedalni in unipedalni stoji ni primeren test za oceno aktivnega prenosa teže znotraj podporne ploskve.

• Language: Slovenian
• Keywords: refleks H, meje stabilnosti, balet
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FŠ - Faculty of Sport
• Year: 2017
• PID: 20.500.12556/RUL-95286
• COBISS.SI-ID: 5270193
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: Conection of h-reflex modulation from prone to standing and limits of stability in professional ballet dancers

Abstract

In order to determine the correlation between the H- reflex modulation and limits of stability in ballet dancers, we measured the amplitude of H-reflex and performed four-way-leaning test of limits of stability. H-reflex was measured to eight professional ballet dancers, active members of Slovenian national ballet in Ljubljana and Maribor (1 male and 7 female, mean age: 25±4,2 years, mean height: 169,25±5,4 cm and an average weight: 56,45±10,1 kg). All participants completed at least 10 years of dance education. Reflex H was measured in 3 conditions: prone, bipedal stance and unipedal stance. The results showed that the ratio of the largest wave H/wave M in bipedal and unipedal stance was lower than in prone. The ratio of the maximum wave H/wave M decreased by 53.3±22.6 % (P <0.001) from prone to the bipedal stance, compared with prone, while in the unipedal stance ratio was 45.2±26.1 % (P <0.001) lower than in prone. The decrease in modulation of reflex H was due to pre-synaptic inhibition. Among the measured variables of the four-way leaning test of limits of stability, the negative connection was determined only with the variable maximal body lean in all four directions. It seems that the modulation of the reflex H in the bipedal and unipedal stance is not a suitable test for assessing the active weight transfer within the support surface.

• Keywords: reflex H, limits of stability, ballet