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    Wyświetlanie 1-10 z 10
    Tytuł:
    Mechanical energy flows between body segments in ballistic track-and-field movements (shot put, discus, javelin) as a performance evaluation method
    Autorzy:
    Błażkiewicz, Michalina
    Łysoń, Barbara
    Wit, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/307218.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomechanika
    energia mechaniczna
    tor
    biomechanics
    mechanical energy
    track and filed
    Opis:
    Seeking a method to evaluate and monitor the performance of the shot put, discus and javelin throw, we analyzed the transfer of mechanical energy between body segments. Methods: The study was conducted on groups consisting of elite throwers on the Polish National Team for each of the aforementioned sport disciplines. The movements of each throw were recorded using Vicon system and Kistler plates. The power and energy fluctuations were computed for the final acceleration phase of each throw. Results: In all three disciplines studied, we found an average energy loss of 1.63 J/kg generated from shoulder to wrist. The value of generated energy from ankle to torso initially increased in all disciplines, followed by a descent – with the exception of the javelin throw, where there was an average 27% decrease in both hip joints. We found strong correlations between relative amplitude values of energy and the athlete’s personal performance records: –0.8226 (shot put), 0.6008 (discus) and 0.7273 (javelin). Conclusions: Measuring the transfer of mechanical energy between body segments offers a useful method for evaluating the technique of ballistic movements and for monitoring training progress.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 1; 31-36
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new method of determination of phases and symmetry in stand-to-sit-to-stand movement
    Autorzy:
    Błażkiewicz, Michalina
    Wiszomirska, Ida
    Wit, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2178873.pdf
    Data publikacji:
    2014-08-06
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    sit
    stand
    symmetry
    healthy young people
    Opis:
    Objectives: Determination of the phases in a stand-to-sit-to-stand task based on a derivative of the parameter with the lowest variance calculated based on the modified symmetry index. Material and Methods: The study group comprised 11 healthy women and 11 healthy men from the University of Physical Education in Warsaw. The examination of the kinematic and kinetic parameters of sitting down and standing up from a chair was carried out using the Vicon Mx system and Kistler force platforms. Results: The modified symmetry index was employed to select the parameters used to choose those with the lowest variance. Consequently, the phases in a stand-to-sit-to-stand task were determined. Conclusions: It was demonstrated that the task of sitting down is a reverse task with respect to standing up in terms of the symmetry of the parameters analyzed.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 4; 660-671
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Types of falls and strategies for maintaining stability on an unstable surface
    Autorzy:
    Błażkiewicz, Michalina
    Wiszomirska, Ida
    Kaczmarczyk, Katarzyna
    Wit, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2162451.pdf
    Data publikacji:
    2018-05-22
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    falls
    postural stability
    biomechanics
    cluster analysis
    range of motion
    loss of balance
    Opis:
    Background Falls constitute an important health issue. They cause significant morbidity, mortality and have marked psychological effects on the individual, too. The aim of this study has been to determine parameters describing human movement strategies for balance and the reaction if balance is lost as a result of an unstable ground, and to attempt to describe the types of falls. Material and Methods The study group comprised 20 volunteers. Kinematic parameters of falling and dynamic stability were measured using the Vicon Motion System and the Biodex Balance System SD. During the test, subjects stood for 20 s on the tilting platform. The analysis was conducted based on the first recordings, when the participants were not prepared for the event and their reactions were natural. A cluster analysis tool was applied to divide the behavior of people during the test. Results Based on motion range for kinematic parameters, the cluster analysis revealed 2 types of human behavior: falling (stepping) and restoring balance. Two types of falls were also observed: side and back falls. Moreover, on the basis of angular values for tilting plate, 4 zones were determined. The frequency of access to these zones by each joint revealed 3 strategies to maintain balance: ankle, knee and hip strategy. Conclusions A set of initial conditions that may be used for future numerical simulations was also determined. Furthermore, the results presented in this study are likely to support the analysis of the effects and the falling patterns. Med Pr 2018;69(3):245–252
    Źródło:
    Medycyna Pracy; 2018, 69, 3; 245-252
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena stabilności posturalnej podczas strzelania
    Evaluation of postal stability during archery
    Autorzy:
    Błażkiewicz, Michalina
    Kędziorek, Justyna
    Bańkowska, Sylwia
    Wit, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2201481.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    stabilność posturalna
    entropia
    łucznictwo
    biomechanika
    postural stability
    entropy
    archery
    biomechanics
    Opis:
    Celem pracy była ocena stabilności posturalnej podczas strzelenia z łuku. W badaniach wzięły udział dwie grupy: zawodowi łucznicy oraz amatorzy, tzn. osoby, które nigdy nie strzelały z łuku. Badania zostały przeprowadzone przy użyciu systemu Vicon i platform Kistler. Do obliczeń zostały eksportowane położenia środka masy ciała. Następnie została policzona długość drogi CoM w przestrzeni 3D oraz współczynniki entropii próbkowej. Wykazano, że długość drogi CoM w przestrzeni 3D jest istotnie (p = 0.0001) dłuższa u łuczników podobnie jak współczynnik entropii próbkowej wzdłuż osi pionowej (p = 0.0117).
    The aim of the work was to assess postural stability during archery. Two groups participated in the study: professional archers and amateurs, i.e. people who never shot a bow. The tests were carried out using the Vicon system and Kistler platforms. Body mass center positions were exported to calculations. Next, the CoM distance in 3D space and sample entropy coefficients were calculated. It was shown that the distance of the CoM path in 3D space is significantly (p = 0.0001) longer in archers, similarly as the sample entropy coefficient along the vertical axis (p = 0.0117).
    Źródło:
    Aktualne Problemy Biomechaniki; 2019, 17; 5--10
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First signs of elderly gait for women
    Autorzy:
    Kaczmarczyk, Katarzyna
    Wiszomirska, Ida
    Błażkiewicz, Michalina
    Wychowański, Michał
    Wit, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2164082.pdf
    Data publikacji:
    2017-06-27
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    ageing
    gait analysis
    factor analysis
    spatiotemporal parameters
    elderly women
    normative data
    Opis:
    Background The aims of this study have been twofold: to attempt to reduce the number of spatiotemporal parameters used for describing gait through the factor analysis and component analysis; and to explore the critical age of decline for other gait parameters for healthy women. Material and Methods A total of 106 women (aged ≥ 40 years old (N = 76) and ≤ 31 years old (N = 30)) were evaluated using a pressure-sensitive mat (Zebris Medical System, Tübingen, Germany) for collecting spatiotemporal gait parameters. Results The factor analysis identified 2 factors – labelled Time and Rhythm – that accounted for 72% of the variation in significant free-gait parameters; the principal component analysis identified 4 of these parameters that permit full clinical evaluation of gait quality. No difference was found between the groups in terms of the values of parameters reflecting the temporal nature of gait (Rhythm), namely step time, stride time and cadence, whereas significant differences were found for total double support phase (p < 0.001). Next, seeking evidence of a critical decline in gait, we selected 3 parameters: total double support, stride time and velocity. We concluded that the women taking part in the experiment manifested significant signs of senile gait after the age of 60 years old, with the first symptoms thereof already manifesting themselves after 50 years of age. Conclusions We show that among 26 spatiotemporal parameters that may be used for characterizing gait, at least a half of them may be omitted in the assessment of gait correctness; a finding that may be useful in clinical practice. The finding that the onset of senile gait occurs in the case of women after the age of 60 years old, in turn, may be useful in evaluating the ability for performing types of physical work that mainly require ambulation. Med Pr 2017;68(4):441–448
    Źródło:
    Medycyna Pracy; 2017, 68, 4; 441-448
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite Evaluation of Broadband Internet Access in Poland
    Autorzy:
    Zawisza, Mateusz
    Kamiński, Andrzej
    Jakuczun, Wit
    Powiązania:
    https://bibliotekanauki.pl/articles/578608.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Dostęp do informacji
    Internet
    Rozwój lokalny
    Rozwój regionalny
    Access to information
    Local development
    Regional development
    Opis:
    The level of access to Internet is constantly evaluated and promoted by electronic communications regulators around the world. The issue is especially important in countries, such as Poland, where where Internet access is highly heterogenous among local markets. The objective of this paper is to identify socio-economic factors that influence the level of Internet access in local communities (gminas) in Poland. The definition of Internet access involves multiple criteria and encompasses in particular its availability, adoption, speed, quality of service and price. In the paper we propose a two-phase approach to a comparison of Internet access in various gminas. First we use Data Envelopment Analysis (DEA) to evaluate Internet broadband access depending on their demographic characteristics based on data from 2010 and 2011 collected by Poland's Office of Electronic Communications (UKE). In the second stage we explain the obtained DEA effectiveness indices using supervised learning techniques with the socio-economic status of the community as explanatory variables. We show that in the period under study rural communities experienced greater Internet access improvement than urban communities, therefore catching up with large cities and reducing technological gap. Moreover, we identify drivers of broadband Internet advancement, including: community type, community education and age structure, computerization level in schools and Herfindahl-Hirschman competition index. We show that an effective regulation may foster the advancement of fixed-location broadband Internet access.
    Źródło:
    Multiple Criteria Decision Making; 2013, 8; 160-177
    2084-1531
    Pojawia się w:
    Multiple Criteria Decision Making
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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