Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "muscle force" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-5 z 5
    Tytuł:
    Characterization of the mechanomyographic signal of three different muscles and at different levels of isometric contractions
    Autorzy:
    Jotta, B.
    Garcia, M. A. C.
    Pino, A. V.
    Souza, M. N. de
    Powiązania:
    https://bibliotekanauki.pl/articles/306272.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mechanomiografia
    sygnał MMG
    mięśnie
    siła mięśni
    mechanomyography
    MMG signal
    muscle twitch
    muscle activation pattern
    muscle force
    Opis:
    Purpose: Lateral (X) and longitudinal (Y) mechanical oscillations of muscle fibers that take place during muscular contraction seem to contain information additionally to the myoelectric activity, which can contribute to the interpretation of some muscle gradation force mechanisms. However, no previous study was found that had investigated the relationship between the muscle force and features associated to the mechanomyographic (MMG) signal obtained by means of a biaxial accelerometer in three different muscles. Therefore, the aim of this study was to evaluate the relationship between the force output at different load levels (20% to 100%) of the maximum voluntary isometric contraction (%MVIC) and the two signals supplied by a biaxial accelerometer and, in addition, the so-called resultant (R) acceleration signal derived from the two signals mentioned previously. Twenty seven male volunteers participated in this study. Methods: The force output related to the right biceps brachii, soleus and gastrocnemius medialis muscles was studied by means of linear regression models fit to log-transformed of the root mean square (RMS) values of the MMG signals in X, Y, and R axes versus each %MVIC. The phase angle of R acceleration (PhaseR) and anthropometric data were also considered. Results: The angular coefficient a and the antilog of y-intercept b from the log-transformed of MMG data values versus force output were able to distinguish partially motor unit strategies during isometric contractions in the three muscles studied. Conclusion: The findings suggest that biaxial accelerometer seems to be an interesting approach in the assessment of muscle contraction properties.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 73-84
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Force analysis of shoulder joint muscles in the early phase of brain stroke
    Autorzy:
    Starosta, M.
    Kostka, J.
    Miller, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306827.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siła mięśni
    staw ramienny
    udar
    dynamometr
    muscle force
    upper limb
    shoulder joint
    stroke
    dynamometer
    Opis:
    Upper limb impairment in the early phase of brain stroke is one of the key problems in rehabilitation. An estimation of muscle force can be a helpful factor for functional improvement after a stroke. The primary goals of this study were to determine the muscles with the lowest force in the affected (A) and non-affected (non-A) upper limb. Moreover, the differences between men and women were compared and these values were correlated with age. Methods: One hundred (n = 35 female, n = 65 male) post-stroke patients met the inclusion criteria. The mean age of the study participants was 66.1 years. Muscle force for external and internal rotators of shoulder was measured with handheld dynamometer. Moreover, the correlation coefficients for differences in muscular force with the patient’s age were estimated. Results: Our study reports that the force of the (A) side in relation to the (non-A) was by 37% weaker. We observed about a 40% decrease in the force of the shoulder’s external rotation (female – 42%; male – 41%) and shoulder’s flexion (by 38% – female; 40% – male). Significant correlations between the muscle force and the age of post-stroke patients were also found. It was concluded that about 4 weeks after the first stroke in the patient’s life, the external rotators are the most affected group of shoulder muscles. Conclusions: Neither sex nor the side of the ischemic brain injury influence the muscle force, whereas age determines both muscle force and muscle force deficits. Older post-stroke patients demonstrate fewer deficits in muscle strength than younger ones.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 3; 107-113
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromyographic Analysis of a Repetitive Hand Gripping Task
    Autorzy:
    Cook, T.
    Rosecrance, J.
    Zimmermann, C.
    Gerleman, D.
    Ludewig, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/91061.pdf
    Data publikacji:
    1998
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    electromyography
    cumulative trauma disorders
    work-rest cycle
    muscle force
    hand gripping
    elektromiografia
    siła mięśni
    cykl pracy
    kończyna górna
    Opis:
    Electromyography (EMG) has been proposed as a method for determining muscle effort in repetitive upper limb tasks, which are often related to cumulative trauma disorders. EMG activity of the finger flexor musculature was investigated during a repetitive hand gripping task having 5 different cycle durations (2 to 6 s), various percentage of work time (and rest) within the work cycle (20% to 80%), and 3 different grip force levels. Thirty healthy adult participants each performed 27 randomly ordered 30-s repetitive hand gripping trials as well as 3 isometric contractions, which were used to normalize data from the hand gripping trials. There was a significant decrease in mean EMG as the duration of the work-rest cycle time increased. At each force level, EMG increased as the percentage of work time within the work-rest cycle increased, but to a greater extent at the highest force level. The results of this study suggest that overall muscle effort, and perhaps muscle fatigue, can be reduced most effectively by modifying the force requirements of the repetitive task. Other variables, such as the percentage of work time within a cycle and overall work cycle time have less effect on the EMG activity level. The results of this study have implications for developing strategies to reduce muscle fatigue during repetitive hand gripping tasks in an effort to reduce the effects of cumulative trauma disorders.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 185-198
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany mocy i skoczności u siatkarek w okresie przygotowawczym
    Changes of power and jumping skill in female volleyball players during preparatory period
    Autorzy:
    Lipińska, M.
    Michalski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99226.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    kończyny dolne
    siła mięśni
    wyskok CMJ
    wyskok BCMJ
    siatkówka kobiet
    lower limbs
    muscle force
    CMJ jump
    BCMJ jump
    women's volleyball
    Opis:
    Celem pracy było określenie zmian mocy kończyn dolnych i wysokości uniesienia środka masy ciała mierzonych w wyskokach CMJ i BCMJ na platformie dynamometrycznej u siatkarek w okresie przygotowawczym. W badaniach uczestniczyło 14 siatkarek. Pomiar mocy kończyn dolnych i wysokości uniesienia środka masy ciała przeprowadzono na platformie dynamometrycznej. Moc maksymalna uległa nieistotnemu zwiększeniu o 6,3% w CMJ i zmniejszeniu o 4,1% w BCMJ podczas gdy wysokość uniesienia środka masy ciała nie uległa zmianie w CMJ i zwiększyła się istotnie o 4,7% w BCMJ.
    The aim of this study was to determine the changes of power of lower limbs and height of rise of the body mass center at CMJ and BCMJ jumps on the dynamometric platform of female volleyball players during preparatory period. Fourteen female volleyball players took part in this study. The measurement of lower limb power and height of rise of the body mass center was carried out on a dynamometric platform. Maximal power has nonsignificantly increased by 6.3% in CMJ, and decreased by 4.1% in BCMJ while height of rise of the body mass centre did not change in the CMJ and increased significantly by 4.7% in BCMJ.
    Źródło:
    Aktualne Problemy Biomechaniki; 2011, 5; 75-80
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective utilization of man shift through sustainable workload testing for underground mining machine operators. An ergonomic based man-machine interface approach
    Autorzy:
    Dey, Netai Chandra
    Dey, Shibaji
    Powiązania:
    https://bibliotekanauki.pl/articles/2064404.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    fatigue sustainability
    FS
    muscle force
    MF
    heart rate ratio
    HR ratio
    exposure time period
    ETP
    effective utilization of man shift
    EUMS
    workload simulation
    siła mięśni
    obciążenie pracą
    okres ekspozycji
    degradacja zmęczeniowa
    tętno
    środowiskowe warunki pracy
    Opis:
    Insight of man-machine interfaces during mining machine operations, better co-ordinance with human efficiencies and suitable workload selection in underground mining machine operation are the main viewpoints of the study. Total 12 side discharge loader (SDL) and load haul dumper (LHD) operators [N = 12] have been taken as participants of the study. The methodology is divided into two parts first part is devoted to measuring and analyzing workload response of machine operation with polar heart rate monitor. Machine operator’s heart rate ratio (HR ratio) for the whole shift is recorded and metabolic rate (MR) has been analyzed. Additionally, fatigue sustainability (FS) and degradation of muscle force (MF) are recorded for each work cycles up to exposure time period (ETP) of 360 minutes. In the second part of the methodology, based on the HR ratio recorded during the mining operation, a workload simulation study is undertaken on a treadmill at the surface following BRUCE protocol. At treadmill, based on HR ratio, workload achieved from mines along with three different workloads i.e. low, moderate and high has been tested. Differences in FS and degradation rate of MF after each workload experiment have been recorded. A result from the underground operational study shows that there is about 43.2% and 32.4% of decreasing MF for SDL and LHD operators after end of spells at mines. Additionally, a negative correlation (r = -0.99) is found between ETP and MF. The workload simulation study shows that there are significant differences between FS (p < 0.05) and MF (p < 0.05) data of mining and treadmill experiment with the same workload. In comparison to an underground operation, FS rate of low, moderate and high workload is recorded 60%, 35%, and 15% higher respectively than of mine workload. Higher FS rate may achieve due to availability of good environment. Among the tested workload only low kind of workload is found suitable for mining machinery job as degradation of MF is found significantly (p < 0.05) low and FS is found significantly (p < 0.01) high in this kind of workload. Therefore, it can be concluded that in mining machinery operation better to adopt low workload for effective utilization of man shift (EUMS) as it gives comparatively low MF degradation and better FS during continuous work.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 394--403
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies