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    Wyświetlanie 1-6 z 6
    Tytuł:
    Low Back Muscle Activity in an Automobile Seat with a Lumbar Massage System
    Autorzy:
    Kolich, M.
    Taboun, S. M.
    Mohamed, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/90384.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    automotive seating
    electromyography
    low back pain
    ból pleców
    elektromiografia
    masaż
    Opis:
    This investigation was conducted to determine the effects of a massaging lumbar support system on low back muscle activity. The apparatus included a luxury-level automobile seat, six 10-mm diameter bipolar surface electrodes, an amplifier, an anaiog-to-digital conversion board, data acquisition software, and a personal computer. Six experimental conditions, each involving a variation of massage time, were considered. The dependent variable was the change in the root mean square variation of the EMG signal. One minute of lumbar massage every 5 min was found to have a beneficial effect on low back muscle activity (as compared to no massage). This may prove to be an extremely important result in the quest to combat low back pain attributable to automobile seating.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 113-128
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Manual Handling, Posture, and Whole Body Vibrations on Low-Back Pain
    Autorzy:
    Meyer, J. P.
    Flenghi, D.
    Deschamps, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/952749.pdf
    Data publikacji:
    1998
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    low back pain
    occupation
    whole body vibration
    posture
    manual handling
    ból pleców
    postura
    stres zawodowy
    Opis:
    To determine the effect of occupational stress on low-back pain (LBP), a cross-sectional study has been carried out, by interviews, on workers exposed to 3 stresses: manual handling (MH, 82 women and 264 men), whole body vibrations (WBV, 274 men), and static postures (278 women). Anthropometric data, occupational stress, LBP severity and frequency, and a psychological evaluation of these groups were compared to those of a control population of 208 workers (104 men and 104 women). The results show that 30% of the population had never suffered from LBP. Age and the body mass index of the workers were the parameters most closely associated with LBP. Women involved in MH had higher frequency and severity of LBP than their reference population. Men involved in MH or exposed to WBV had higher frequency of painful episodes than their reference population. Workers exposed to one of the stresses were on sick leave for LBP more often, and for longer periods, than workers in the reference group. The results show that individual factors are often decisive in the onset of LBP. Nevertheless, in the more serious LBP cases, occupational stress is an aggravating factor for LBP and its consequences.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1998, 4, 4; 449-470
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Low Back Pain Risks in a Beef Skinning Operation
    Autorzy:
    Das, B.
    Sengupta, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/89837.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    low back pain
    biomechanical analysis
    ergonomic analysis
    posture analysis
    meat processing
    ból pleców
    analiza biomechaniczna
    analiza ergonomiczna
    postawa
    Opis:
    The low back pain risks in a beef skinning operation at a high stand kill floor workstation was evaluated. The increases in compressive forces at lower back (L5/S1) between normal slump (back angle 25°, measured in the sagittal plane) and severe (45°) and between normal slump and very severe (70°) bent back postures were 387 N or 28% and 616 N or 45%, respectively. The high spine load coupled with high level of repetition can have a high probability of fatigue failure in the spine structural members. Non-neutral back posture for a large portion of the total work time can be a low back pain risk factor. The videotape analysis showed that the times involved during the task performance for the bent back (more than 25°) and severe bent back (more than 45°) were 48.4 and 33.5% of the total cycle time, respectively. The upper limit from OWAS (Ovako Working Posture Analysis System) for bent back posture is 30% of the total cycle time. The bent and twisted back posture (both more than 25°) time was 10.4% compared to OWAS limit of 5%. This indicated that actions are needed in the near future to alleviate the risk of low back pain. Ergonomics redesign of the workstation was recommended for the operation.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 3; 347-361
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Experience and the Presence of a Scaffold Handrail on Postural and Spinal Stability in Construction Workers
    Autorzy:
    Min, S. N.
    Kim, J. Y.
    Parnianpour, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/91154.pdf
    Data publikacji:
    2014
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    fall
    low back pain
    postural stability
    lumbar stability
    construction
    injury
    ból pleców
    stabilność postawy
    pracownicy budowlani
    rusztowanie budowlane
    Opis:
    The goal of this study was to quantify the effect of experience and handrail presence on trunk muscle activities, rotational spinal stiffness and postural stability of construction workers. We evaluated spinal stability, and objective and subjective postural stability in 4 expert and 4 novice construction workers who were performing a manual task in a standing position on a scaffold, with and without a safety handrail. Center of pressure was computed using measurements taken with insole pressure transducers. Muscle activity was monitored usingsurface electrodes placed on 8 trunk muscles that predicted active trunk rotational stiffness. Standard deviations of the center of pressure, back muscle activity and spinal stiffness were greater in novices and in the absence of a handrail. We infer that the risk of a fall due to postural and spinal instability may be greater with a lower level of experience and in the absence of a safety handrail.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2014, 20, 3; 491-502
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevalence of Musculoskeletal Disorders at Workplaces in the Peoples Republic of China
    Autorzy:
    Bao, S.
    Winkel, J.
    Shahnavaz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/90895.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    ergonomics
    epidemiology
    cross-sectional study
    low back pain
    shoulder-neck disorders
    developing countries
    assembly workers
    ergonomia
    epidemiologia
    ból pleców
    kraje rozwijające się
    Opis:
    This paper presents 2 musculoskeletal disorders questionnaire surveys in 10 different Chinese occupational groups. Data collected from 1,603 workers using a modified Nordic musculoskeletal disorders symptom questionnaire showed that the 12-month prevalence of musculoskeletal disorders, particularly in the low back and shoulder-neck regions, was high at many Chinese workplaces. Significant differences existed between occupational groups. Assembly workers usually had higher neck-shoulder complaints compared to workers in most other occupations. However, the nature of assembly seemed also to influence the prevalence rate. Workers at a cassette recorder and a TV set assembly plant appeared to have more neck complaints compared with a group of thermos flask assemblers.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 557-574
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromyographic evaluation of selected muscles during active hip extension in men treated McKenzie method
    Autorzy:
    Jabłońska, Magdalena
    Fryzowicz, Anna
    Ogurkowska, Małgorzata Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/27324135.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    low back pain
    sEMG
    movement pattern
    prone hip extension
    ból dolnej części pleców
    wzór ruchu
    skłonny do wyprostu bioder
    Opis:
    Purpose: The aim of this study was to evaluate objective results of short-term treatment with the use of electromyography and to determine changes in muscle recruitment during the prone hip extension test in individuals with chronic low back pain who underwent the McKenzie treatment. Methods: The studied group consisted of 17 male office workers aged 33–55 who underwent two experimental sessions comprising of 3 measurements and the McKenzie method of mechanical diagnosis and therapy. Electromyographic examination of selected muscles was performed during the test in order to assess changes in their activity before and after the McKenzie method and the Visual Analogue Scale was used to assess the level of pain. Results: There was a tendency towards significance at the beginning of activation between the first and second test for the left erector spinae muscle ( p = 0.0684). In 18% of patients, the onset activation time decreased, which is indicative of correct direction of changes. No statistically significant changes were observed in the remaining muscles. Statistical significance ( p = 0.0131) was observed between the first and third test for the left erector spinae muscle. A decrease in the onset activation time was observed in 75% of the subjects. Effectiveness increased by as much as 57%. The level of pain decreased in the third test compared to the first one ( p = 0.0240). However, the change in pain sensations between the first and second test was not statistically significant. Conclusions: The study showed objective changes in the activation sequence of selected muscles and subjective changes in pain following short term McKenzie therapy.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 3; 23--31
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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