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    Tytuł:
    Paraspinal bioelectrical muscle activity differentiation with surface EMG in active seniors
    Różnicowanie napięć bioelektrycznych mięśni przykręgosłupowych u aktywnych seniorów przy użyciu powierzchniowego EMG
    Autorzy:
    Kielnar, Renata
    Oleksy, Łukasz
    Grzegorczyk, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1963446.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    SEMG
    lumbar spine
    paraspinal muscles
    seniors
    sEMG
    kręgosłup lędźwiowy
    mięśnie przykręgosłupowe
    senior
    Opis:
    Background: Physical, social and intellectual activities are the determinants of successful ageing. Movement effectively delays the body’s ageing process and prevents many diseases in our body. Aim: The assessment of lumbar paraspinal muscle activity patterns with surface EMG in an active older population without low back pain.Material and methods: The study included 70 students of the „university of the third age”. The subjects’ paraspinal muscles were assessed during a lumbar spine functional test. All measurements were carried out using sEMG.Results: During most of the performed movements, lumbar paraspinal muscles activation impairments were observed, these being characterized by increased activity, asymmetry and lack of relaxation response.Conclusion: Surface EMG allows for non-invasive muscle pattern screening, therefore it could constitute a valuable tool in lumbar spine functional diagnostics in active older populations through innovatory data analysis.
    Wstęp: Aktywność fizyczna, społeczna, a takŜe intelektualna jest jednym z czynników warunkujących pomyślne starzenie się człowieka. Ruch skutecznie opóźnia proces starzenia się organizmu i zapobiega powstawaniu wielu chorób w naszym organizmie. Cel: Ocena wzorców aktywności mięśniowej mięśni przykręgosłupowych w odcinku lędźwiowym kręgosłupa z wykorzystaniem elektromiografii powierzchniowej w grupie aktywnych seniorów bez objawów bólu krzyża. Materiał i metoda: Badaniem objęto 70 aktywnych studentów uniwersytetu trzeciego wieku. U wszystkich badanych oceniono napięcie mięśni przykręgosłupowych w trakcie testu funkcjonalnego dla odcinka lędźwiowego kręgosłupa. Badanie przeprowadzono z wykorzystaniem sEMG. Wyniki: Podczas większości wykonywanych ruchów u aktywnych osób starszych zaobserwowano zaburzenia aktywności bioelektrycznej mięśni przykręgosłupowych odcinka lędźwiowego kręgosłupa, charakteryzujące się podwyższonym napięciem mięśniowym, zaburzoną symetrią napięcia prawej strony do lewej oraz brakiem rozluźnienia poszczególnych mięśni podczas ruchów, gdzie nie powinny być one aktywne. Wnioski: sEMG pozwala na nieinwazyjne badania przesiewowe wzorców aktywności mięśniowej, może być pomocnym narzędziem w diagnostyce funkcjonalnej odcinka lędźwiowego kręgosłupa u aktywnych seniorów, między innymi dzięki nowatorskim metodom analizy danych.
    Źródło:
    Medical Rehabilitation; 2012, 16(3); 9-15
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disbalance and fatigue of the spinal extensors as one of the causes of the overload disease of the lumbar spine
    Autorzy:
    Zyznawska, Joanna
    Frankowski, Grzegorz
    Wodka-Natkaniec, Ewa
    Kołomańska, Daria
    Boczoń, Kamila
    Kulesa-Mrowiecka, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/307233.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zmęczenie
    SEMG
    zaburzenia równowagi
    fatigue
    sEMG
    muscular disbalance
    extensor muscle
    overload disease
    Opis:
    The aim of the study was to find out whether among young active people – the future healthcare professionals – there is a risk of developing lumbar spine overload disease depending on the occurrence of the disbalance of paravertebral muscles and to assess the fatigue of the examined muscles depending on the body position during the work. Methods: The study involved 50 randomly selected students of physiotherapy and emergency medical services of a mean age of 21 years. The surface electromyography (sEMG) was used to measure the activity level of spinal extensors of the cervical and lumbar spine. The statistical analysis of the results was made using the RStudio software. Results: Study shows that the majority of the examined students had a slight asymmetry between the bioelectric activity of the right- and left-side dorsal extensor bands, both in the cervical and lumbar sections (right side 118.6 Hz / left side 115.7 Hz / extension and 98.6 Hz / 95.5 Hz /flexion). Depending on the position, significant fatigue in the examined muscles was found ( p < 0.05). Conclusions: The experiment showed a slight disbalance in the average bioelectromyographic activity in the area of spinal extensors during their symmetrical work. This can be the basis for the development of the overload disease in the weaker muscle parts, which generate more fatigue during the activity. It is worth to carry out similar tests in a much greater group, taking the longer-lasting muscular effort into account.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 3; 119-125
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The dependence on posture of temporalis and masseter bioelectrical muscle activity
    Ocena aktywności bioelektrycznej mięśni skroniowych i żwaczy w zależności od postawy ciała
    Autorzy:
    Kielnar, Renata
    Mika, Anna
    Oleksy, Łukasz
    Jureczko, Paweł
    Marchewka, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1963078.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    SEMG
    cervical spine
    masticatory system
    Opis:
    Background: Masticatory dysfunctions are a common problem in society today. Disorders such as clenching, bruxism can lead to a loosening of teeth in the jaw, abrasion of the tooth crowns, inflammatory changes, and ultimately degenerative changes in the temporo-mandibular joints.Aim: The aim of this study was to assess the relationship between masseter and temporalis anterior muscles activity and body posture.Material and Methods: In 20 subjects (20-35 years) the sEMG of the masseter and temporalis anterior muscles was measured twice during functional clenching: in casual posture and in posture with the head in retraction. The study was conducted using sEMG Tele-Myo (Noraxon). Results: The bioelectrical activity of the evaluated muscles was significantly higher in the casual posture than in retraction (p<0.05). Temporomandibular disorders appear not only due to facial muscle activity abnormalities, but also due to incorrect body posture, especially a head forward posture. The measurement was performed twice in a sitting position: in casual posture and in a posture with the head in retraction. Mean masseter activity during teeth clenching was statistically significant in retraction compared to the habitual position (p<0.05), both for the left and right side. There was also statistically significant activity in the temporalis muscles in retraction compared to the habitual position.Conclusion: The observed decreased activities in both the masseters and temporalis muscles suggest that masticatory system dysfunctions may not only be the result of dysfunction in the craniofacial region but also may be posture dependent.
    Źródło:
    Medical Rehabilitation; 2011, 15(4); 10-14
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences in myoelectric manifestations of fatigue during isometric muscle actions
    Autorzy:
    Gawda, P.
    Ginszt, M.
    Ginszt, A.
    Pawlak, H.
    Majcher, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081734.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    vastus medialis oblique
    squatting
    sEMG
    fatigue
    Opis:
    Introduction. Muscle fatigue has been studied for a long time with the use of a wide variety of exercise models, protocols and assessment methods, among which surface electromyography (sEMG) is most commonly used. The main sEMG parameters (amplitude and frequency) are prevalently used to evaluate the level of muscle fatigue in static and dynamic contractions. Objective. The purpose of this study is to determine and compare 2 separate indices: IF1 basis of the sEMG signal amplitude analysis and IF2 basis of the sEMG median frequency analysis, related to muscles fatigue during an isometric contraction. Materials and method. The study was performed on 60 professional runners divided into 2 equal groups. The first group comprised sprinters, competing in short distance track and field events (100 and 200 meters). The second group consisted of middle-distance runners, competing in middle-distance track and field events (800 and 1,500 meters). The electrical activity of the VMO muscles of the right and left lower limbs was recorded simultaneously during isometric activity in a squatting position. The sEMG data was used to determine and compare IF1 and IF2 indices. Results. During isometric measurement, sprinters presented a much more significant increase in the mean amplitude of sEMG signal in comparison to middle-distance runners (mean IF1 difference: 0.228; p=0.007). Analysis of the median frequency did not show significant differences between the 2 groups (mean IF2 difference: 0.037; p=0.12). Conclusions. Change in sEMG amplitude during isometric exercise may be related to muscles fatigue. The use of fatigue indices, based on sEMG amplitude, as an objective indicator of the efficacy of an endurance training programme for sportsmen requires further research.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 296-299
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    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:
    Bioelectric activity of mastication muscles and the functional impairment risk groups concerning the masticatory muscles
    Autorzy:
    Zieliński, G.
    Suwała, M.
    Ginszt, M.
    Szkutnik, J.
    Majcher, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/306205.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    TMD
    sEMG
    czynniki ryzyka
    temporalis anterior
    masseter muscle
    risk factors
    Opis:
    Temporomandibular disorders affect from 5 to 12 percent of the population, occurring almost twice as often in women than in men. The painful form of temporomandibular disorders is one of the most common musculoskeletal disorders causing pain. The chronic form is associated with changes in activity of the masticatory muscles and can lead to sleep problems, reduction of emotional state and worsening of quality of life. Methods: 66 women were included in the study group. The study was composed of a clinical evaluation of temporomandibular disorders and assessment of the masticatory muscle activities using surface electromyography. The anterior part of the temporalis muscle and the superficial part of the masseter muscle were evaluated during teeth clenching on cotton rolls. The symmetric activity index was calculated from the results of electromyographic activity. Based on the activity and symmetric activity index values, subjects were qualified to the risk group of temporomandibular disorders. Results: Twenty people (30.3 percent) qualified for the temporomandibular disorders risk group. In the temporomandibular disorders risk group, the mean symmetric activity index value of the anterior part of the temporal muscle was 72.6 percent and the mean electromyographic activity was 143.94 microvolts. In the masseter muscle, the mean symmetric activity index value was 67.7 percent and the mean electromyographic activity was 155.33 microvolts. Conclusions: Temporomandibular disorders may develop in 30.3 percent of examined women. The research should be continued to determine the temporomandibular disorders risk group, which may enable for the appropriate prevention of the development of dysfunctions in the stomatognathic system.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 161-166
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of robot therapy assisted by surface EMG on hand recovery in post-stroke patients. A pilot study
    Wpływ rehabilitacji z zastosowaniem robota wspomaganej przez powierzchowne EMG na poprawę sprawności ręki u chorych po udarze mózgu − badanie pilotażowe
    Autorzy:
    Dziemian, Katarzyna
    Kiper, Aleksandra
    Baba, Alfonc
    Baldan, Francesca
    Alhelou, Mahmoud
    Agostini, Michela
    Turolla, Andrea
    Kiper, Pawel
    Powiązania:
    https://bibliotekanauki.pl/articles/1790970.pdf
    Data publikacji:
    2018-04-09
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    stroke
    sEMG
    robot-aided therapy
    rehabilitation
    udar mózgu
    terapia wspomagana robotem
    rehabilitacja
    Opis:
    Background: Hemiparesis caused by a stroke negatively limits a patient’s motor function. Nowadays, innovative technologies such as robots are commonly used in upper limb rehabilitation. The main goal of robot-aided therapy is to provide a maximum number of stimuli in order to stimulate brain neuroplasticity. Treatment applied in this study via the AMADEO robot aimed to improve finger flexion and extension. Aim: To assess the effect of rehabilitation assisted by a robot and enhanced by surface EMG. Research project: Before-after study design. Materials and methods: The study group consisted of 10 post-stroke patients enrolled for therapy with the AMADEO robot for at least 15 sessions. At the beginning and at the end of treatment, the following tests were used for clinical assessment: Fugl-Meyer scale, Box and Block test and Nine Hole Peg test. In the present study, we used surface electromyography (sEMG) to maintain optimal kinematics of hand motion. Whereas sensorial feedback, provided by the robot, was vital in obtaining closed-loop control. Thus, muscle contraction was transmitted to the amplifier through sEMG, activating the mechanism of the robot. Consequentially, sensorial feedback was provided to the patient. Results: Statistically significant improvement of upper limb function was observed in: Fugl-Meyer (p = 0.38) and Box and Block (p = 0.27). The Nine Hole Peg Test did not show statistically significant changes in motor skills of the hand. However, the functional improvement was observed at the level of 6% in the Fugl-Meyer, 15% in the Box and Block, and 2% in the Nine Hole Peg test. Conclusions: Results showed improvement in hand grasp and overall function of the upper limb. Due to sEMG, it was possible to implement robot therapy in the treatment of patients with severe hand impairment.
    Background: Hemiparesis caused by a stroke negatively limits a patient’s motor function. Nowadays, innovative technologies such as robots are commonly used in upper limb rehabilitation. The main goal of robot-aided therapy is to provide a maximum number of stimuli in order to stimulate brain neuroplasticity. Treatment applied in this study via the AMADEO robot aimed to improve finger flexion and extension. Aim: To assess the effect of rehabilitation assisted by a robot and enhanced by surface EMG. Research project: Before-after study design. Materials and methods: The study group consisted of 10 post-stroke patients enrolled for therapy with the AMADEO robot for at least 15 sessions. At the beginning and at the end of treatment, the following tests were used for clinical assessment: Fugl-Meyer scale, Box and Block test and Nine Hole Peg test. In the present study, we used surface electromyography (sEMG) to maintain optimal kinematics of hand motion. Whereas sensorial feedback, provided by the robot, was vital in obtaining closed-loop control. Thus, muscle contraction was transmitted to the amplifier through sEMG, activating the mechanism of the robot. Consequentially, sensorial feedback was provided to the patient. Results: Statistically significant improvement of upper limb function was observed in: Fugl-Meyer (p = 0.38) and Box and Block (p = 0.27). The Nine Hole Peg Test did not show statistically significant changes in motor skills of the hand. However, the functional improvement was observed at the level of 6% in the Fugl-Meyer, 15% in the Box and Block, and 2% in the Nine Hole Peg test. Conclusions: Results showed improvement in hand grasp and overall function of the upper limb. Due to sEMG, it was possible to implement robot therapy in the treatment of patients with severe hand impairment.
    Źródło:
    Medical Rehabilitation; 2017, 21(4); 4-10
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanics of the shoulder girdle : a case study on the effects of union rugby tackles
    Autorzy:
    Faria, L.
    Campos, B.
    Jorge, R. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/307526.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bark
    dynamometr
    izokinetyka
    sEMG
    shoulder
    rotator cuff
    pressure sensors
    force plate
    isokinetic dynamometer
    Opis:
    Purpose: The shoulder girdle is a complex system, comprised by a kinematic chain and stabilizers. Due to the delicate equilibrium and synchronism between mobility and stability, high external loads may compromise its physiology, increasing the risk of injuries. Thus, this study intends to fully characterize the effects of a rugby tackle on the shoulder’s anatomy and physiology. Methods: For the experimental procedures, a matrix of pressure sensors was used, based on the Teckscan® pressure in-soles, force plates, an isokinetic dynamometer and sEMG (surface electromyography). Results: The anterosuperior region of the shoulder girdle confirmed the highest pressure values during impact (100 kPa to 200 kPa). Also, the right and left feet performed a vertical peak force of 1286 N (1.4 BW) and 1998 N (2.21 BW), respectively. The muscular activity of the shoulder muscles decreased after performing multiple tackles. Conclusions: During a tackle, the clavicle, scapula, trapezius and acromioclavicular joint are the anatomical structures with higher risk of injury. Also, the strike force on the feet decreases for stability purposes. After performing multiple impacts the muscular activity of the trapezius and rotator cuff muscles decreases, which may lead, in the long-term, to instability of the shoulder and inefficiency of the scapulohumeral rhythm.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 115-127
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    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
    Tytuł:
    Effects of Neutral Posture on Muscle Tension During Computer Use
    Autorzy:
    Dowler, E.
    Kappes, B.
    Fenaughty, A.
    Pemberton, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/91099.pdf
    Data publikacji:
    2001
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    video display terminal
    sEMG
    working position
    keyboard position
    workstation modifications
    pozycja przy pracy
    komputer
    ergonomia
    mierzenie pracy i wysiłku
    VDT
    Opis:
    This study focused on developing a new approach to seated work positions as conducted on 67 office workers who use a Visual Display Terminal (VDT) as a major function of their working day. Muscle tension was measured by surface electromyography (sEMG) while participants were asked to adopt 4 selected working postures. Pain was measured before and after ergonomic intervention on the Nordic scale, which was modified for this study. Adjustable workstations were used to place participants in desired positions during the clinical testing sessions and the extended intervention period. Results indicate the effects of this ergonomic intervention may have positive effects on muscle tension and pain, significant enough to encourage employers to implement training and workstation modifications following these guidelines.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2001, 7, 1; 61-78
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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