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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Influence of Fatigue on Muscle Temperature
    Autorzy:
    Bartuzi, P.
    Roman-Liu, D.
    Wiśniewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90607.pdf
    Data publikacji:
    2012
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    EMG
    muscle fatigue
    muscle temperature
    biceps brachii
    Opis:
    The aim of the study was to investigate the possibility of using infrared (IR) thermography for assessing muscle fatigue during low effort. Three tests at constant levels of load 5, 15 and 30% of maximum voluntary contraction (MVC) lasting 5 min each were performed on a group of 10 men. Temperature and electromyographic (EMG) signal were registered from biceps brachii (BB). Analysis focused on the influence of load on the values and changes in time of muscle temperature. Correlations between temperature and EMG parameters (RMS, MPF and MF) were also analysed. Constant load sustained during the tests resulted in an increase in the temperature of BB. There were statistically significant correlations between temperature and EMG parameters for most subjects. Results of the study suggest that IR thermography can be an alternative or supplementary method for assessing muscle fatigue at low levels of contraction.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2012, 18, 2; 233-243
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Age and Type of Force on Muscle Strength Capabilities in Women
    Autorzy:
    Tokarski, T.
    Roman-Liu, D.
    Kamińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/90634.pdf
    Data publikacji:
    2012
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    muscle
    strength
    ageing
    women
    Opis:
    The aim of this study was to assess handgrip and 5 other types of force in 52 women and to determine if handgrip force reflected general upper limb force capabilities correlated with age. The women were divided into subgroups according to age: 20–25, 45–50 and 55–65 years. Maximum forces of the right upper limb were measured in 6 types of force activities. In most tests the values of force showed statistically significant differences between the 20–25 group and the groups aged 45–50 and 55–64 years. The results did not show any differences related to age or to force activities that involved the small muscles of the forearms and hands. Thus handgrip force cannot always be considered an indicator of total force capabilities.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2012, 18, 1; 47-57
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of muscle load and fatigue with the usage of frequency and time-frequency analysis of the EMG signal
    Autorzy:
    Bartuzi, P.
    Roman-Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307422.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biomechanics
    EMG
    fatique
    muscle load
    wavelet
    mięśnie
    obciążenie
    zmęczenie
    falka
    Opis:
    The aim of the study was to determine the effect of the muscle load and fatigue on the values of the parameters calculated on the basis of the time, frequency (Fourier transform) and time-frequency (wavelet transform) analysis of the EMG signal, for low levels of load. Fifteen young men took part in the study. The EMG signal was registered from right side biceps brachii (BB) and trapezius (TR) muscles in static conditions, at load 10%, 20% and 30% MVC (maximal voluntary contraction). On the basis of the analysis there were selected parameters sensitive to force (RMS) and parameters sensitive to fatigue but simultaneously insensitive to force (MPF – mean power frequency determined on the basis of Fourier transform, CMPFdb5 – mean power frequency determined on the basis of the wavelet transform). The results indicate that CMPFdb5 can show similar (muscle BB) or greater (muscle TR) sensitivity to fatigue than MPF. It can suggest that, for low levels of load, the wavelet transform parameters can be more effective in assessing muscle fatigue than the parameters based on the Fourier transform. The obtained results can allow for a more precise analysis of muscle fatigue at low levels of load. Further analysis for a greater number of muscles activated at low levels of load, with the usage of the parameters tested is desirable.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 31-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences in Lumbar Spine Load Due to Posture and Upper Limb External Load
    Autorzy:
    Kamińska, J.
    Roman-Liu, D.
    Zagrajek, T.
    Borkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/89864.pdf
    Data publikacji:
    2010
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    finite element model
    muscle co-operation
    spine load
    lumbar spine
    Opis:
    As the lumbar region of the spine is particularly predisposed to musculoskeletal disorders, the aim of this article was to assess lumbar spine load on the basis of an accurate model of this part of the body. The model was developed with the finite element method and the energy criterion for optimising muscle work. Computer calculations confirmed that stresses and compression forces in intervertebral discs increased with an increase in the load force and that they were significantly larger in the bent forwards posture than in the erect posture. This result clearly shows that lifting light objects and the erect posture are important elements in minimising spine load.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2010, 16, 4; 421-430
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ typu mięśnia na parametry widma mocy sygnału EMG
    The influence of muscle type on EMG power spectrum parameters
    Autorzy:
    Bartuzi, P.
    Roman-Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/98897.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    sygnał elektromiograficzny
    EMG
    mięśnie
    budowa morfologiczna
    electromyographic signal
    muscle
    morphological structure
    Opis:
    Celem pracy było opracowanie wskaźników, opartych na widmie mocy sygnału elektromiograficznego (EMG), obrazujących budowę morfologiczną mięśnia. Sygnał EMG został zarejestrowany z mięśni: czworoboczny część zstępująca (trapezius pars descendens-TPD), naramienny część obojczykowa (deltoideus pars clavicularis-DPC), naramienny część barkowa (deltoideus pars acromialis-DPA) oraz zginacz łokciowy nadgarstka (flexor carpi ulnaris-FCU), podczas badań w 6 wariantach obciążenia. W wyniku analizy opracowano parametry widma mocy sygnału EMG, szczególnie wrażliwe na zmiany w strukturze mięśnia.
    The aim of this study was to develop coefficients of electromyographic (EMG) signal, which show the morphological properties of muscle. Measurements of EMG signal from muscles: trapezius pars descendens (TPD), deltoideus pars clavicularis (DPC), deltoideus pars acromialis (DPA) and flexor carpi ulnaris (FCU), during research in 6 variants of load were realized. As the result of analysis the parameters based on power spectrum of EMG signal were worked out. Differences between morphological structure of muscle can be described using these parameters.
    Źródło:
    Aktualne Problemy Biomechaniki; 2008, 2; 7-12
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of the Influence of Muscle Type and Muscle Force Level on Individual Frequency Bands of the EMG Power Spectrum
    Autorzy:
    Bartuzi, P.
    Roman-Liu, D.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90164.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    EMG power spectrum
    upper limb
    muscle type
    extensor digitorum
    palmaris longus
    biceps brachii
    Opis:
    The aim of this study was to analyse the electromyographic (EMG) power spectrum indicating differences in the frequency bands of the spectrum resulting from differences in muscle type and force level for the extensor digitorum (ED), palmaris longus (PL) and biceps brachii (BB) muscles. The study was performed on 12 young men as 2 tests different in terms of the type of exerted force (30, 15 and 5% MVC, maximum voluntary contraction). The parameters of the EMG power spectrum were obtained as a result of a division of the EMG power spectrum into ranges determined by border frequencies. The results suggest that (a) frequency bands contained in the 30–80 Hz range and over the frequency of 300 Hz depend on muscle force, and (b) the power spectrum in the frequency range of up to 40 Hz and 60–300 Hz indicates muscle type.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 3; 241-254
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Musculoskeletal Load of the Trapezius and Deltoid Muscles During Hand Activity
    Autorzy:
    Roman-Liu, D.
    Tokarski, T.
    Kamińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/91179.pdf
    Data publikacji:
    2001
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    electromyography
    muscle fatigue
    precision work
    hand activities
    choroby narządów ruchu
    fizjologia mięśni
    praca mięśni
    ręka
    Opis:
    The purpose of the study was to analyse the influence of the precision of a task on tension and fatigue of the trapezius and deltoid muscles. Ten young men took part in experiments. Different levels of force and different frequencies of pressing a button defined the precision of the task. Surface electromyography (EMG) was used. Muscle tension and fatigue were reflected by 2 parameters of the EMG signal: the Root Mean Square amplitude related to the maximum value and changes in the Median Power Frequency. The results showed that hand activities influence the descending part of the trapezius muscle and do not influence the deltoid muscle, and that the precision of work can influence the examined muscles of the arm and shoulder even during work in which only the hand is involved in a performed task.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2001, 7, 2; 179-193
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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