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    Wyświetlanie 1-10 z 10
    Tytuł:
    Shoulder girdle muscle activity and fatigue in traditional and improved design carpet weaving workstations
    Autorzy:
    Allahyari, Teimour
    Mortazavi, Narges
    Khalkhali, Hamid Reza
    Sanjari, Mohammad Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/2177075.pdf
    Data publikacji:
    2015-10-21
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    muscle activity
    surface electromyography
    muscle fatigue
    carpet weaving
    workstation
    perceived fatigue
    Opis:
    Objectives Work-related musculoskeletal disorders in the neck and shoulder regions are common among carpet weavers. Working for prolonged hours in a static and awkward posture could result in an increased muscle activity and may lead to musculoskeletal disorders. Ergonomic workstation improvements can reduce muscle fatigue and the risk of musculoskeletal disorders. Material and Methods The aim of this study is to assess and to compare upper trapezius and middle deltoid muscle activity in 2 traditional and improved design carpet weaving workstations. These 2 workstations were simulated in a laboratory and 12 women carpet weavers worked for 3 h. Electromyography (EMG) signals were recorded during work in bilateral upper trapezius and bilateral middle deltoid. The root mean square (RMS) and median frequency (MF) values were calculated and used to assess muscle load and fatigue. Repeated measure ANOVA was performed to assess the effect of independent variables on muscular activity and fatigue. The participants were asked to report shoulder region fatigue on the Borg’s Category-Ratio scale (Borg CR-10). Results Root mean square values in workstation A are significantly higher than in workstation B. Furthermore, EMG amplitude was higher in bilateral trapezius than in bilateral deltoid. However, muscle fatigue was not observed in any of the workstations. Conclusions The results of the study revealed that muscle load in a traditional workstation was high, but fatigue was not observed. Further studies investigating other muscles involved in carpet weaving tasks are recommended.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2016, 29, 2; 345-354
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hip strategy alterations in patients with history of low disc herniation and non-specific low back pain measured by surface electromyography and balance platform
    Autorzy:
    Ciesielska, J.
    Lisiński, P.
    Bandosz, A.
    Huber, J.
    Kulczyk, A.
    Lipiec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/306847.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    staw biodrowy
    postawa ciała
    balansowanie
    platforma
    low back pain
    postural control
    surface electromyography
    hip strategy
    balance platform
    Opis:
    Purpose: The appearance of pathology in the lumbar spine, such as a previous episode of low disc herniation or non-specific low back pain contributes to improper activation of the hip muscles. The aim of the study was to detect alterations in hip strategy manifested by differences in balance parameters and rectus femoris and gluteus maximus activity in people with previous episode of pain radiation to one lower limb caused by low disc herniation or non-specific low back pain. Methods: We studied 11 patients with history of low-disc herniation, 9 patients with history of non-specific low back pain and 10 healthy subjects. Hip strategy alterations were detected by measuring rectus femoris and gluteus maximus activity in bilateral surface polyelectromyographic recordings and by stability measurements on a balance platform. Results: In the surface polyelectromyography study, in both patients' group the value of the average amplitude was higher and the amount of the fluctuations was lower than in healthy subjects. There were no significant differences in stability parameters. Conclusions: A changed pattern of hip muscles activity was detected in the patients without changes in stability parameters. Greater disorder occurs in people in with previous episode of pain radiation to one lower limb caused by low disc herniation than in people with non-specific low back pain.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 103-108
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie metod wykonywania badań biomechaniki ruchu człowieka przy wykorzystaniu elektromiografii kinezjologicznej
    Test methods development of biomechanics of human movement utilizing the kinesiological electromyography
    Autorzy:
    Kukla, Mateusz
    Wieczorek, Bartosz
    Warguła, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/313036.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    biomechanika ruchu
    elektromiografia powierzchniowa
    normalizacja
    wózek inwalidzki
    biomechanics of movement
    surface electromyography
    normalization
    wheelchair
    Opis:
    W artykule przedstawiono zagadnienia dotyczące opracowania metod wykonywania badań biomechaniki ruchu człowieka przy wykorzystaniu elektromiografii kinezjologicznej. Szczegółowo omówiono utworzone procedury dotyczące wyboru umiejscowienia elektrod, przygotowania pacjenta do badań, przeprowadzania eksperymentu oraz opracowania wyników pomiarów. Przedstawiono również wybrane wyniki badań wstępnych.
    The article presents the issues concerning the development of methods for performing human biomechanics research utilizing kinesiological electromyography. The procedures concerning the selection of the location of electrodes, patient preparation for testing, conducting the experiment and the development of measurement results are discussed in detail. Selected preliminary test results were also presented.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 295-298
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the influence of low and high heel shoes on erector spine muscle bioelectrical activity assessed at baseline and during movement
    Ocena wpływu obuwia na niskich i na wysokich obcasach na aktywność bioelektryczną mięśnia prostownika kręgosłupa ocenianą w spoczynku i podczas ruchu
    Autorzy:
    Mika, Anna
    Oleksy, Łukasz
    Mikołajczyk, Edyta
    Marchewka, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1942933.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    surface electromyography
    lumbar spine
    heel shoes
    sequence test
    elektromiografia powierzchniowa
    kręgosłup lędźwiowy
    obcasy
    test sekwencyjny
    Opis:
    Introduction: Back pain due to the wearing of high heel shoes may result from increased erector spine activity and also from higher proximal ground reaction forces or center of body mass dislocation.Aim: The assessment of changes in the erector spine muscle due to the non-physiological foot position in low and high heel shoes.Material and Methods: In 31 women aged 20-25 years (height 167,6 ±5.8 cm; weight 60,35 ±6,49 kg) without back pain, the bioelectrical activity of the erector spine muscle was assessed. A lumbar spine sequence test was performed without shoes and in low (4 cm) and in high (10 cm) heel shoes. Muscle activity on the right and left sides was evaluated at baseline and during movement. The mean and peak signal value were compared between 3 measurements (without, in low and in high heel shoes).Results: A statistically significant increase in erector spine activity was observed in Trunk Flexion (p<0,05) and during Flexion-Relaxation Position (p<0,05) when wearing high hell shoes. Those variables correlated significantly in all 3 measurements (without, in low and in high heel shoes). A significant correlation was noted between the Flexion-Relaxation Position and Extension/Flexion Ratio (p<0,05). Bioelectrical erector spine activity differed significantly during Rotation Right and Rotation Left in all 3 measurements respectively (p<0,05).Conclusion: The prolonged wearing of shoes with stiletto type low and high heels by individuals without back pain is not safe for their spine and may lead to chronic paraspinal muscle fatigue
    Źródło:
    Medical Rehabilitation; 2009, 13(3); 9-18
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie EMG do analizy wybranych ruchów kończyny górnej
    Application of EMG for the analysis of chosen movement of upper limb
    Autorzy:
    Morawska, N.
    Wojnicz, W.
    Stawicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/98704.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    elektromiografia powierzchniowa
    sygnał bioelektryczny
    mięsień
    surface electromyography
    bioelectrical signal
    muscle
    Opis:
    Celem badań było przeprowadzenie pomiarów sygnału mioelektrycznego czterech mięśni powierzchniowych lewej kończyny górnej, biorących udział w ruchach zginania-prostowania w stawie łokciowym w płaszczyźnie strzałkowej. Rejestrację elektromiogramów (EMG) odprowadzono z: głowy długiej oraz bocznej mięśnia trójgłowego ramienia, głowy długiej mięśnia dwugłowego ramienia i mięśnia ramienno-promieniowego. Wykazano, iż metoda może zostać wykorzystana do oceny funkcjonowania wybranych mięśni.
    The aim of the study was to perform measurements of the sEMG signal for the analysis of the four surface muscles of the left upper limb participating in the flexion-extension movements at the elbow in the sagittal plane. Electromyography signal was measured and registered from the long head and lateral head of the triceps of the arm, the long head of the biceps and muscle brachioradialis. It has been shown that this method can be used to evaluate functioning of selected muscles.
    Źródło:
    Aktualne Problemy Biomechaniki; 2016, 11; 103-108
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of probability density functions in modeling sample distribution of surface electromyographic (sEMG) signals
    Autorzy:
    Rosa, I. G.
    Garcia, M. A. C.
    Souza, M. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/230062.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromyography
    EMG
    surface EMG
    sEMG
    EMG onset detection
    Opis:
    The surface electromyography signal (sEMG) has been typically modeled as a Gaussian random process. However, some authors have reported that the probability density functions (pdfs) associated with the sample distribution of sEMG signal exhibits a more peaked shape than one could expected for a Gaussian pdf. This work aimed to reinvestigate the profile of the sEMG pdfs during five different load levels of isometric contractions of biceps brachii muscle, and compared the adequacy of four different pdfs (Gaussian, Logistic, Cauchy, and Laplacian) in describing the sample distribution of such signal. Experimental pdfs were estimated for each subject and load condition. The comparison between experimental pdfs obtained from sEMG data of forty volunteers and four theoretical pdfs was performed by fitting these functions to its experimental counterpart, and using a mean absolute errors in the assessment of the best fit. On average, the Logistic pdf seemed to be the best one to describe the sample distribution of sEMG signal, although the probabilistic results, considering binomial trials, were significant for both Gaussian and Logistic pdfs.
    Źródło:
    Archives of Control Sciences; 2013, 23, 4; 381-393
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Comparative Analysis of the Kayak Forward Stroke
    Autorzy:
    Skopek, Martin
    Bacakova, Radka
    Bily, Milan
    Tunkova, Kristyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1922209.pdf
    Data publikacji:
    2019-06-05
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    counterflow pool
    kayak
    paddling
    surface electromyography
    Opis:
    This work follows previous research in the field which investigated the comparison of two types of paddling. These studies, however, focused on the similarity of kayaking and trainers, more precisely ergometers, that are used by racers during their training in the winter. However, the results of these studies indicate a significant difference in muscle involvement. Aim of Study: The aim of this study is to describe and to compare the muscle activation of the kayak forward stroke performed in a pool with an opposite/counter current and on flat/calm water. Material and Methods: The research was conducted via a selected sample of eight kayakers (subjects) who had attained a high level of performance in whitewater slalom. We observed the activity of twelve selected muscles used during the kayak forward stroke performed in a counterflow pool and on flat water by means of surface electromyography and kinematic analysis. Study results point to effects in relation to intraindividual and subsequently inter-individual muscle timing and the size of the muscle activation due to maximal voluntary contraction. We used comparative analysis and the data were measured by surface electromyography and 2D video-analysis. Results: The results proved equal timing of muscles in a counterflow pool and on flat water. The muscle activity in the counterflow pool was bigger than on flat water. Conclusion: From our results we can recommend a pool which makes use of a counter current as a replacement training tool. Compared with other training devices which might be used (such as, crank ergometers, paddling trainers, and paddling pools), this kind of training device gives the kayaker one great advantage. It is the fact that the kayaker has the same placement of the fixed point and the preservation of the feeling of grasping water.
    Źródło:
    Physical Activity Review; 2019, 7; 107-113
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shoulder girdle muscle activity and fatigue during automobile chassis repair
    Autorzy:
    Tian, Baozhen
    Yu, Suihuai
    Chu, Jianjie
    Li, Wenhua
    Powiązania:
    https://bibliotekanauki.pl/articles/2161964.pdf
    Data publikacji:
    2019-07-15
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    muscle activity
    surface electromyography
    muscle fatigue
    perceived level of discomfort
    automobile chassis repair
    shoulder postures
    Opis:
    Objectives The objective of this study was to assess the postures that were commonly used in automobile chassis repair operations, and to evaluate shoulder girdle muscle fatigue for different combinations of the weight of hand-tools. Material and Methods Two right muscles, including upper trapezius (UT) and middle deltoid (MD), were selected. Surface electromyography (SEMG) and a perceived level of discomfort (PLD) were used to assess the degree of shoulder girdle fatigue. Fifteen healthy young male subjects from the Northwestern Polytechnical University participated in the test. The test consisted of assuming 4 different postures and maintaining each of them for 60 s. The 4 postures varied in terms of dumbbell weights, standing for the hand-tools weight: W1 was 0.48 kg and W2 was 0.75 kg; the 4 shoulder postures were shoulder flexions of 150°, 120°, 90°, and 60°, combined with an included elbow angle of 180°, 150°, 120° and 90°, respectively. The experimental sequences were randomly selected. The signals of SEMG and the values of PLD in the shoulder girdle were recorded in 60 s. All subjects completed the whole test. The repeated measure analysis of variance (ANOVA) was performed to ascertain differences between dumbbell weight (0.48 kg and 0.75 kg) and shoulder postures (150°/180°, 120°/150°, 90°/120° and 60°/90°). The Friedman test was utilized to determine the significant differences for UT(PLD) and MD(PLD) on shoulder postures. Spearman’s correlation was used to analyze the relationship between the subjective and objective measurements. Results Significant correlational relationships existed between the UT percentage of the maximal voluntary electrical activation (%MVE) and UT(PLD) (r = 0.459, p < 0.01), between MD(%MVE) and MD(PLD) (r = 0.821, p < 0.01). The results showed that SEMG and PLD of the 4 postures under analysis differed significantly (p < 0.05). Conclusions It was indicated that posture T4 (shoulder forward flexion 60° and included elbow angle 90°) resulted in the lowest fatigue, both in terms of the objective measure and the subjective perception, which meant that this posture was more ergonomic. Int J Occup Med Environ Health. 2019;32(4):537–52
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2019, 32, 4; 537-552
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The muscle activation patterns of lower limb during stair climbing at different backpack load
    Autorzy:
    Yali, H.
    Aiguo, S.
    Haitao, G.
    Songqing, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/307250.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chód
    schody
    aktywność mięśni
    elektromiografia powierzchniowa
    stair climbing
    backpack load
    muscle activation pattern
    surface electromyography
    Opis:
    Stair climbing under backpack load condition is a challenging task. Understanding muscle activation patterns of lower limb during stair climbing with load furthers our understanding of the factors involved in joint pathology and the effects of treatment. At the same time, stair climbing under backpack load requires adjustments of muscle activations and increases joint moment compared to level walking, which with muscle activation patterns are altered as a result of using an assistive technology, such as a wearable exoskeleton leg for human walking power augmentation. Therefore, the aim of this study was to analyze lower limb muscles during stair climbing under different backpack load. Nine healthy volunteers ascended a four-step staircase at different backpack load (0 kg, 10 kg, 20 kg, 30 kg). Electromyographic (EMG) signals were recorded from four lower limb muscles (gastrocnemius, tibialis anterior, hamstring, rectus femoris). The results showed that muscle activation amplitudes of lower limb increase with increasing load during stair climbing, the maximum RMS of gastrocnemius are greater than tibialis anterior, hamstring and rectus femoris whether stair climbing or level walking under the same load condition. However, the maximum RMS of hamstring are smaller than gastrocnemius, tibialis anterior and rectus femoris. The study of muscle activation under different backpack load during stair climbing can be used to design biomechanism and explore intelligent control based on EMG for a wearable exoskeleton leg for human walking power augmentation.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 13-20
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for designing the longitudinal position of a porthole in a manned submersible based on the back muscle fatigue characteristics
    Autorzy:
    Zhu, Mengya
    Chen, Dengkai
    Fan, Yu
    Guo, Jiayan
    Powiązania:
    https://bibliotekanauki.pl/articles/2094205.pdf
    Data publikacji:
    2021-12-13
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    surface electromyography
    muscle fatigue
    work efficiency
    manned submersible
    porthole position design
    oceanauts
    Opis:
    ObjectivesThe proper porthole angle contributes to relieving the operation fatigue and improving the efficiency of oceanauts. In this study, the authors explored the effect of 3 different porthole longitudinal positions on the oceanauts’ back muscles using surface electromyography (sEMG) analysis, and the characteristics of the perceived body comfort was obtained.Material and MethodsOverall, 40 healthy participants were recruited to perform tasks in a simulated cabin environment. Electromyographic (EMG) signals were recorded from the trapezius medius, lower trapezius, and erector spinal muscles for porthole angles of –5°, –15°, and +15°, relative to the horizontal line of sight during a 21-minute experiment. The subject comfort scores were collected at 7, 14 and 21 min. The integrated electromyogram (iEMG) and the root mean square (RMS) of EMG signals, as well as the mean power frequency (MPF), and the mean frequency (MF) were calculated.ResultsThe subjective scores of the +15° porthole at each stage of work are higher than those of the –15° and –5° portholes. The results of iEMG, RMS, MF and MPF all indicated that the +15° porthole design was more conducive to lowering the rate of muscle fatigue, while the –5° and –15° portholes increased the muscle fatigue rate and led to greater fatigue. It was found that the lower trapezius was more prone to fatigue than the trapezius medius and erector spinal muscles. The height, weight and body mass index of the participants were found to negatively correlate with muscles at the +15° porthole, which is highly consistent with the actual situation.ConclusionsThe findings suggested that the +15° position was optimal for delaying the muscle fatigue of the participants and for improving the work efficiency of oceanauts.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 6; 701-721
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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