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    Wyświetlanie 1-11 z 11
    Tytuł:
    Upper Limb Load as a Function of Repetitive Task Parameters: Part 1 - A Model of Upper Limb Load
    Autorzy:
    Roman-Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/90123.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    external load
    upper limb
    handgrip force
    cycle work
    repetitive task parameters
    praca powtarzalna
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    obciążenie pracą
    Opis:
    The aim of the study was to develop a theoretical indicator of upper limb musculoskeletal load based on repetitive task parameters. As such the dimensionless parameter, Integrated Cycle Load (ICL) was accepted. It expresses upper limb load which occurs during 1 cycle. The indicator is based on a model of a repetitive task, which consists of a model of the upper limb, a model of basic types of upper limb forces and a model of parameters of a repetitive task such as length of the cycle, length of periods of the cycle and external force exerted during each of the periods of the cycle. Calculations of the ICL parameter were performed for 12 different variants of external load characterized by different values of repetitive task parameters. A comparison of ICL, which expresses external load with a physiological indicator of upper limb load, is presented in Part 2 of the paper.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 93-102
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upper Limb Load as a Function of Repetitive Task Parameters: Part 2 - An Experimental Study
    Autorzy:
    Roman-Liu, D.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90499.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    electromyography
    upper limb
    handgrip force
    cycle load
    praca powtarzalna
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    elektromiografia
    obciążenie pracą
    Opis:
    The aim of the study was to compare the theoretical indicator of upper limb load with the physiological indicator of musculoskeletal load, which is present while performing a repetitive task (a normalized electromyography [EMG] amplitude recorded from the muscles of the upper limb involved in the performed task). In an experimental study of a repetitive task, the EMG signal from 5 main muscles of the shoulder girdle, arm and forearm was registered: extensor carpi radialis longus, flexor carpi ulnaris, deltoideus anterior, biceps brachii caput breve and trapezius descendent. The results of the study showed a strong correlation between the theoretical indicator (Integrated Cycle Load) and the physiological indicator (root mean square of a normalized EMG amplitude from the 5 muscles). This proves that the developed theoretical indicator can be accepted as an indicator of upper limb musculoskeletal load during a work task.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 103-112
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Verification of the Computerized Method for Work Space Optimization in Conditions of Static Work
    Autorzy:
    Roman-Liu, D.
    Kędzior, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/91230.pdf
    Data publikacji:
    1999
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    EMG
    upper extremity load
    intermittent load
    constant load
    kończyny górne
    obciążenie kończyn
    obciążenie stałe
    miejsce pracy
    Opis:
    The aim of this study was to verify a theoretical model for upper extremity work space optimization. In order to do that, experimental studies were conducted in which two parameters of the electromyography (EMG) signal were analyzed: AMP (amplitude calculated as Root Mean Square) and SZC (coefficient of the slope of the regression line between time and Zero Crossing values). Values of forces in muscles (parameter MOD) were calculated from theoretical studies. A comparison of experimental (AMP, SZC) and theoretical (MOD) parameters was performed by analyzing the coefficient of correlation between those parameters and differentiation of muscular load according to external load value. Analysis showed that the theoretical and experimental results are in step, which means that the developed model can be used for upper extremity work space optimization.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1999, 5, 1; 109-124
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    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:
    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:
    Analysis of Postural Load During Tasks Related to Milking Cows—A Case Study
    Autorzy:
    Groborz, A.
    Tokarski, T.
    Roman-Liu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/90722.pdf
    Data publikacji:
    2011
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    postural load
    milking cows
    case study
    Opis:
    The aim of this study was to analyse postural load during tasks related to milking cows of 2 farmers on 2 different farms (one with a manual milk transport system, the other with a fully automated milk transport system) as a case study. The participants were full-time farmers, they were both healthy and experienced in their job. The Ovako Working Posture Analyzing System (OWAS) was used to evaluate postural load and postural risk. Postural load was medium for the farmer on the farm with a manual milk transport system and high for the farmer working on the farm with a fully automated milk transport system. Thus, it can be concluded that a higher level of farm mechanization not always mean that the farmer’s postural load is lower, but limitation of OWAS should be considered.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 423-432
    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
    Tytuł:
    Computerized Method for Work Space Optimization in Conditions of Static Work
    Autorzy:
    Roman-Liu, D.
    Kędzior, K.
    Rzymkowski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/89905.pdf
    Data publikacji:
    1999
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    work space optimization
    computer modeling
    upper extremity
    miejsce pracy
    modelowanie komputerowe
    kończyna górna
    Opis:
    The aim of this research was to develop a theoretical method for the ergonomic optimization of the work space of the upper limb. This method is based on a model of the upper extremity with 7 degrees of freedom. It consists of 3 rigid elements modeling the arm, forearm, and hand and 34 upper extremity muscles. The trunk is considered immobile. The shoulder joint is modeled as a rotating kinematics pair of third class, the elbow and wrist joints - of fourth class. The minimum sum of muscle force moments in the joints and soft saturation muscle cooperation criterion were used as merit criteria. The developed method makes it possible to effectively solve, in a defined work space, the task of work space optimization.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1999, 5, 1; 97-108
    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:
    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:
    The Effect of an Ergonomic Intervention on Musculoskeletal, Psychosocial and Visual Strain of VDT Data Entry Work: The Polish Part of the International Study
    Autorzy:
    Konarska, M.
    Wolska, A.
    Widerszal-Bazyl, M.
    Bugajska, J.
    Roman-Liu, D.
    Aaras, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/90638.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    data entry operators
    workload
    ergonomic interventions
    ergonomia
    warunki pracy
    praca biurowa
    choroby narządów ruchu
    komputer
    bazy danych
    stres
    zagrożenie zdrowia
    układ kostny
    Opis:
    A group of routine data entry operators (female) was included in the Polish MEPS (musculoskeletal-eyestrain-psychosocial-stress) study. Before the intervention, ergonomic assessment revealed improper working conditions such as inadequate lighting, uncomfortable chairs, and lack of forearm and wrist support while medical examination revealed that trapezius muscle load along with upper arm, head and back angles were higher than advisable. Subjects complained about neck and shoulder pain, visual problems, and psychosocial conditions. The ergonomic intervention included installation of new luminaires and Venetian blinds, new chairs, repair of ventilators, and optometric corrections. The results after the intervention showed mainly improvement in chair comfort, lighting conditions, visual strain, and sitting posture. However, financial limitations did not allow satisfactory completion of the intervention leading to a mixed interpretation of the results.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 65-76
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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