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    Wyświetlanie 1-3 z 3
    Tytuł:
    The level of body balance in standing position and handstand in seniors athletes practicing artistic gymnastics
    Autorzy:
    Puszczałowska-Lizis, Ewa
    Omorczyk, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/306238.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pozycja stojąca
    stanie na rękach
    stabilność
    standing position
    handstand
    stabilometry
    Opis:
    The aim of the study was to compare the values of selected stability indices registered in the trials in standing with eyes open and without visual control, and in handstand in athletes practicing artistic gymnastics at the highest level of advancement. Methods: The study included 20 athletes practicing artistic gymnastics. The research tool was posturograph CQ-Stab 2P. The results obtained in individual trials were compared using Friedman repeated measures analysis of variance by ranks and then subjected to Dunn post-hoc test with Bonferroni adjustment. Results: Statistically significant differences in the values of stability indices recorded in individual samples were found. Exceptions are the results obtained in the trials with eyes open and without visual control with regard to the size of the surface area delineated by the COP ( p = 0.173) and the frequency of corrective reactions ( p = 0.464), as well as the length of the statokinesiogram path in the mediolateral direction ( p = 0.342), mean velocity of COP movement in the mediolateral direction ( p = 0.246), maximal amplitude of the COP in the mediolateral direction ( p = 0.342) and number of COP displacements in the mediolateral direction ( p = 0.246). Conclusions: In seniors, disabling visual control during free standing as well as adopting a handstand position result in deterioration of the stability indices, which is a resultant of the COP displacement in both directions as well as in the anteroposterior direction. Lack of differences in the values of stability indices in the mediolateral direction suggest that in a free standing position, seniors practicing artistic gymnastics control the movement of the center of foot pressure in the mediolateral direction and eye control is not important for the stability of the body in the frontal plane.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 37-44
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Balance in handstand and postural stability in standing position in athletes practicing gymnastics
    Autorzy:
    Omorczyk, J.
    Bujas, P.
    Puszczałowska-Lizis, E.
    Biskup, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/306945.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    równowaga
    stanie na rękach
    pozycja wolnostojąca
    gimnastyka
    balance
    handstand
    free standing position
    gymnastics
    Opis:
    Purpose: The aim of this study was to compare and analyse of relationships between stability indices registered in two positions: standing and handstand in athletes practicing gymnastics at various levels of advancement. Methods: The study included 46 athletes practicing gymnastics. The research tool was posturograph CQ-Stab 2P. Results: In both standing position and handstand in the seniors there were statistically significantly lower values of such indicators as: sway area delimited by the center of pressure ( p = 0.004, p = 0.014), mean amplitude of COP ( p = 0.021, p = 0.017), mean displacement of the center of feet/hands pressure in medio-lateral direction ( p = 0.011, p = 0.003) and maximal displacement of the center of feet/hands pressure in mediolateral direction ( p = 0.036, p = 0.036). In the standing position, seniors also had statistically significantly lower values of the statokinesiogram path length, both total ( p = 0.000) as well as in anteroposterior ( p = 0.001) and mediolateral ( p = 0.002) directions. In the seniors group there were statistically significant correlations between variables obtained in standing position and handstand. Conclusions: The level of sport advancement significantly differentiates the stability of a body in standing position and handstand. The seniors practicing gymnastics, compared to juniors, are characterized by a better ability to control the position of the body in both positions. The lack of relationships between stability indices registered in standing and handstand in juniors suggests that the analysis of the values of stability indices obtained in a standing position does not provide the possibility of predicting the ability to maintain balance in the handstand during the recruitment of candidates for gymnastics.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 139-147
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A computational evaluation of sedentary lifestyle effects on carotid hemodynamics and atherosclerotic events incidence
    Autorzy:
    Caruso, M. V.
    Serra, R.
    Perri, P.
    Buffone, G.
    Calio, F. G.
    Franciscis, S.
    Fragomeni, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/307512.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siedzący tryb życia
    pozycja siedząca
    komputerowa mechanika płynów
    CFD
    miażdżyca
    sedentary lifestyle
    sitting
    computational fluid dynamics
    carotid bifurcation
    atherosclerosis
    standing
    Opis:
    Purpose: Hemodynamics has a key role in the atheropathogenesis. Indeed, atherosclerotic phenomena occur in vessels characterized by complex geometry and flow pattern, like the carotid bifurcation. Moreover, the lifestyle is a significant risk factor. The aim of this study is to evaluate the hemodynamic effects due to two sedentary lifestyles -sitting and standing positions- in the carotid bifurcation in order to identify the worst condition and to investigate the atherosclerosis incidence. Methods: The computational fluid dynamics (CFD) was chosen to carry out the analysis, in which in-vivo non-invasive measurements were used as boundary conditions. Furthermore, to compare the two conditions, one patient-specific 3D model of a carotid bifurcation was reconstructed starting from computer tomography. Different mechanical indicators, correlated with atherosclerosis incidence, were calculated in addition to flow pattern and pressure distribution: the time average wall shear stress (TAWSS), the oscillatory shear index (OSI) and the relative residence time (RRT). Results: The results have highlighted that the bulb and the external carotid artery emergence are the most probable regions in which atherosclerotic events could happen. Indeed, low velocity and WSS values, high OSI and, as a consequence, areas with chaotic-swirling flow, with stasis (high RRT), occur. Moreover, the sitting position is the worst condition: considering a cardiac cycle, TAWSS is less than 17.2% and OSI and RRT are greater than 17.5% and 21.2%, respectively. Conclusions: This study suggests that if a person spends much time in the sitting position, a high risk of plaque formation and, consequently, of stenosis could happen.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 43-52
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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