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    Tytuł:
    Force-Velocity Characteristics of Individual Human Skeletal Muscles: TBCIat and TBCIong. Outline of the Method
    Autorzy:
    Kornecki, S.
    Siemieński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/90398.pdf
    Data publikacji:
    1998
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    force-velocity characteristics
    modeling of the locomotor system
    muscle synergy problem
    iteration procedure
    układ ruchowy
    staw łokciowy
    synergia mięśniowa
    Opis:
    The aim of the work is to outline a procedure of finding force-velocity (F-V) characteristics (F = f(V)) of individual skeletal muscles of the human locomotor system. The presentation is based on an example concerning extensors of the elbow joint: the lateral and long heads of triceps brachii (TBCIat and TBCIong). The experimental part of the procedure involves a natural movement of using the upper extremity to push an external object of variable, adjustable load, engaging both the elbow and shoulder joint. Five men aged 23 took part in the experiment. Their task was to push the handle of a physical pendulum whose moment of inertia could be adjusted within the range of 58 kg ∙ m2-450 kg ∙ m2, so as to give it maximum angular velocity. During each trial the movement of the trunk, of the upper extremity and of the pendulum was video recorded and the force applied with the hand to the handle of the pendulum was measured. In order to find the F-V characteristics a simulation model SHOULDER was used, which is capable of solving the synergy problem for muscles of the arm and the shoulder girdle. It was found that despite considerable dispersion of experimental points the respective regression lines revealed a clear tendency of decreasing muscle force for increased shortening velocity of the monoarticular head (TBCIat) and of increasing muscle force for increased lengthening velocity of the Particular head (TBCIong) of the triceps brachii muscle.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1998, 4, 1; 75-83
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ratios of torques of antagonist muscle groups in female soccer players
    Autorzy:
    Struzik, A.
    Siemieński, A.
    Bober, T.
    Pietraszewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/307148.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    staw kolanowy
    asymetria
    ścięgna
    asymmetry
    knee joint
    hamstring-to-quadriceps ratio
    Opis:
    An increase in the value of the hamstring-to-quadriceps (H/Q) ratio with an increase in angular velocity may effectively prevent injuries of the back of the thigh. Previous studies have found that the conventional H/Q ratio was unaltered along with an increasing angular velocity in females. Therefore, this study aimed to investigate the relationships between the conventional H/Q ratio and angular velocity in a group of female soccer players. Methods: The study was carried out on a group of 16 female soccer players (age: 20.7 ± 3.9 years, body height: 166.1 ± 5.8 cm, body mass: 58.4 ± 6.2 kg, training experience: 8.8 ± 4.1 years). Measurements of peak torque of extensors and flexors of the knee joint under static conditions and under isokinetic conditions (at angular velocities of 30°/s, 60°/s, 90°/s and 120°/s) were carried out using a Biodex dynamometer. Results: There was a statistically significant increase in the conventional H/Q ratio with an increase in angular velocity. These differences occurred between measurements at angular velocities of 0°/s and 30°/s, and 30°/s and 60°/s. Conclusions: As previously found for males, an increase in conventional H/Q ratio with increased angular velocity was also present in this group of female players. This phenomenon should reduce the number of injuries of the muscles of back of the thigh. Coaches should pay attention to increasing the level of strength in the group of knee joint flexor muscles so as to make the value of the H/Q ratio appropriately high and increasing with increasing angular velocity.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 153-158
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower extremity power in female soccer athletes : a pre-season and in-season comparison
    Autorzy:
    Pietraszewski, B.
    Siemieński, A.
    Bober, T.
    Struzik, A.
    Rutkowska-Kucharska, A.
    Nosal, J.
    Rokita, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307077.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    skoki
    trening plyometryczny
    energia
    biomechanika
    countermovement jump
    drop jump
    plyometric training
    relative power
    Opis:
    Purpose: Lower extremity power is an important physical capacity of a soccer athlete. Power represents, and can be modified by, the training of strength and speed. Pre-season and in-season training differs in the relative emphasis on these two quantities. It is nevertheless desirable that the mechanical power remain the same or become higher during the in-season period. The purpose of this study was to identify changes in quantities related to “explosive strength” and to check whether, in collegiate female soccer players, pre- and inseason lower extremity power will remain unaltered. Methods: Twenty collegiate female soccer players, representing all field positions, participated. Lower extremity power was assessed by a series of drop jumps executed from four different heights (15, 30, 45, and 60 cm). Mechanical power was calculated using subject’s mass, jump height, and acceleration due to gravity. This value was further normalized by body mass of each athlete to obtain the relative (or normalized) mechanical power. Results: The normalized lower extremity mechanical power was highest when landing from the 30 cm height for both pre- and inseason periods. However, contrary to expectations, it turned out lower during the in-season than during the pre-season test, even though no significant differences were found between the corresponding jump heights. Conclusions: It is concluded that altered, perhaps inadequate, training strategies were employed during the in-season period. Besides, advantages of adding the relative mechanical power as a season readiness indicator are underlined compared with relying on the jump height alone.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 129-135
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar drgań krystalizatora ciągłego odlewania stali (COC) na cele diagnostyczne - badania modelowe
    Continuous steel casting machine mould oscilation measurement and analysis - simulation investigations
    Autorzy:
    Bień, A.
    Siemieński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/320243.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ciągłe odlewanie stali
    drgania krystalizatora
    Continuous Steel Casting Machine
    mould oscillations
    Opis:
    Artykuł przedstawia propozycję analizy stanów pracy krystalizatora w urządzeniu COS na podstawie pomiaru przyspieszenia występującego na krystalizatorze. Autorzy dają krótki opis technologii COS, dzięki któremu łatwiej będzie Czytelnikowi zrozumieć źródło pomysłu proponowanego rozwiązania, prosty model drgań krystalizatora -wykorzystany do badań symulacyjnych, wyniki pomiarów przeprowadzonych na rzeczywistym obiekcie oraz ich analizę widmową. Podsumowaniem jest porównanie wyników badań symulacyjnych z wynikami pomiarów i przedstawienie możliwych perspektyw rozwoju proponowanego rozwiązania.
    The paper puts forth a proposal to analyze work of Continuous Steel Casting Machine mould by measurement of its acceleration. Authors outline short description of Continuous Steel Casting technology which will allow reader to understand origin of the proposed solution, simple model of mould oscillations that was used for simulations, and real measurements results and their analyzes. Summary of the paper is comparison of measurements and simulations results as well as prospect for further development of enrolled conception.
    Źródło:
    Elektrotechnika i Elektronika; 2007, 26, 1--2; 7-13
    1640-7202
    Pojawia się w:
    Elektrotechnika i Elektronika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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