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    Wyświetlanie 1-9 z 9
    Tytuł:
    Nonlinear measures in posturography compared to linear measures based on yoga poses performance
    Autorzy:
    Błażkiewicz, MIchalina
    Powiązania:
    https://bibliotekanauki.pl/articles/27324088.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    postural control
    center of pressure
    yoga
    complexity
    regularity
    kontrola postawy
    środek nacisku
    joga
    złożoność
    prawidłowość
    Opis:
    Yoga is known as a type of exercise that combines physical, mental and spiritual aspects. There has not been much research on the postural control in various yoga poses. The aim of this study was to examine CoP regularity in both yoga instructors and novices during the performance of four yoga poses, and to verify the sensitivity of linear and nonlinear methods for assessing postural stability. Methods: The dynamic characteristics of CoP fluctuations were examined using linear and nonlinear methods on a group of 22 yoga instructors (Y) and 18 age-matched non-practitioners of yoga (NY). The study involved maintaining a balance for 20 seconds while performing four yoga poses. Results: Conventional analysis of CoP trajectories showed that NY and Y exhibited similar control of postural sway, as indicated by similar CoP path-length and area values observed in both groups. These results suggest that the special balance yoga training received by Y may not have an impact on less challenging balance conditions, such as the poses used in this experiment. Interestingly, nonlinear dynamical analysis of CoP showed that Y exhibited less CoP regularity and more complex signal than NY, as evidenced by higher values of sample entropy and fractal dimension. Conclusions: The results shed light on the surplus values of CoP trajectories in the nonlinear dynamical analysis to gain further insight into the mechanisms involved in posture control.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 4; 15--21
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena stabilności posturalnej w funkcji różnego ustawienia stóp na podłożu przy wykorzystaniu miar dynamiki nieliniowej
    Assessment of postural stability as a function of changing support surface
    Autorzy:
    Kędziorek, Justyna
    Błażkiewicz, Michalina
    Powiązania:
    https://bibliotekanauki.pl/articles/2201496.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    stabilność posturalna
    miary nieliniowe
    biomechanika
    postural stability
    non-linear measures
    biomechanics
    Opis:
    Celem pracy była ocena stabilności posturalnej w różnych warunkach podparcia: stanie obunóż, jednonóż i w tandemie przy oczach otwartych. W badaniach wzięła udział grupa trzydziestu trzech zdrowych osób w wieku 21.88 ± 1.65 lat. Badania zostały przeprowadzone przy użyciu platformy AMTI AccuSway (30 sekund – każda próba). Do obliczeń eksportowano położenia środka nacisku stóp na podłoże (CoP) w płaszczyznach x i y. Następnie została policzona długość drogi CoP i współczynniki dynamiki nieliniowej: entropia próbkowa, wymiar fraktalny i wykładnik Lapunowa. Wykazano, że zmniejszenie pola powierzchni podparcia powoduje istotny wzrost współczynnika entropii próbkowej i wymiaru fraktalnego.
    The aim of the study was to assess postural stability under different base of support: both foot standing, one-leg standing and tandem with eyes open. A group of thirty-three healthy persons aged 21.88 ± 1.65 years participated in the study. The tests were carried out using the AMTI AccuSway platform. The locations of the center of foot pressure (CoP) in the X and Y planes were exported. Then the CoP path length and nonlinear dynamics coefficients were calculated: sample entropy, fractal dimension and Lapunov exponent. It has been shown that the reduction of the support surface area causes a significant increase in the sample entropy factor and the fractal dimension.
    Źródło:
    Aktualne Problemy Biomechaniki; 2020, 19; 20--26
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ buta typu Walker z zegarem na zmianę parametrów kinematycznych w stawach kończyn dolnych w chodzie
    The influence of rom walker on lower limb kinematics during gait
    Autorzy:
    Lann vel Lace, Karol
    Błażkiewicz, MIchalina
    Powiązania:
    https://bibliotekanauki.pl/articles/2201484.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    orteza
    analiza chodu
    parametry kinematyczne
    biomechanika
    orthosis
    gait analysis
    kinematic parameters
    biomechanics
    Opis:
    Celem pracy jest określenie wpływu różnych ustawień ortezy typu Walker na zmianę kątów w stawach kończyn dolnych podczas chodu. W badaniach wzięło udział 10 zdrowych osób. Do badań czterech rodzajów chodu -jeden bez ortezy i trzy w różnych ustawieniach ortezy wykorzystano system Vicon. Udowodniono, że sposób ustawienia ortezy ma istotny wpływ na zmianę kątów w stawie kolanowym i biodrowym kończyny dolnej, na której jest noszona orteza. Bardzo korzystny jest brak wpływu ortezy na kinematykę kończyny wolnej od ortezy.
    The aim of the work is to determine the effect of various settings of Walker type orthosis on lower limb kinematics parameters during walking. 10 healthy people participated in the study. The Vicon system was used to test four types of the gait - one without an orthosis and three in different orthosis settings. It has been proven that the way the orthosis is positioned has a significant impact on changing the angles in the knee and hip joints of the lower limb, on which the orthosis is worn. The absence of the orthotic effect on the kinematics of the limb free from orthosis is very beneficial.
    Źródło:
    Aktualne Problemy Biomechaniki; 2019, 17; 35--42
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Comparison of muscle activity during hand rim and lever wheelchair propulsion over flat terrain
    Autorzy:
    Błażkiewicz, Michalina
    Wiszomirska, Ida
    Fiok, Krzysztof
    Mróz, Anna
    Kosmol, Andrzej
    Mikicin, Mirosław
    Molik, Bartosz
    Marszałek, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/306401.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomechanika
    aktywność mięśni
    EMG
    wózek inwalidzki
    biomechanics
    assistive technology
    muscle activity
    wheelchair
    lever
    Opis:
    The aim of this study was to compare the activity of upper limb muscles during hand rim wheelchair propulsion and lever wheelchair propulsion at two different velocity levels. Methods: Twenty male volunteers with physical impairments participated in this study. Their task was to push a lever wheelchair and a hand rim wheelchair on a mechanical wheelchair treadmill for 4 minutes at a speed of 3.5 km/h and 4.5 km/h in a flat race setting (conditions of moving over flat terrain). During these trials, activity of eight muscles of upper limbs were examined using surface electromyography. Results: The range of motion in the elbow joint was significantly higher in lever wheelchair propulsion (59.8 ± 2.43°) than in hand rim wheelchair propulsion (43.9 ± 0.26°). Such values of kinematics resulted in a different activity of muscles. All the muscles were more active during lever wheelchair propulsion at both velocity levels. The only exceptions were extensor and flexor carpi muscles which were more active during hand rim wheelchair propulsion due to the specificity of a grip. In turn, the examined change in the velocity (by 1 km/h) while moving over flat terrain also caused a different EMG timing of muscle activation depending on the type of propulsion. Conclusions: Lever wheelchair propulsion seems to be a good alternative to hand rim wheelchair propulsion owing to a different movement technique and a different EMG timing of muscle activity. Therefore, we believe that lever wheelchair propulsion should serve as supplement to traditional propulsion.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 67-74
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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