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    Wyświetlanie 1-31 z 31
    Tytuł:
    Evaluation of relationship between the results of selected tests for muscle strength assessment of the hip abductors
    Autorzy:
    Szczygieł, E.
    Kotla, K.
    Masłoń, A.
    Golec, J.
    Czechowska, D.
    Staszkiewicz, R.
    Krzywda, E.
    Golec, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306845.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biodro
    siła mięśni
    test
    hip
    muscle strength
    functional testing
    Opis:
    Purpose: The assessment of hip joint abductor muscle strength is most often carried out using a dynamometric test. However, both in clinical practice and literature, evaluation is performed by means of the single-leg half-squat or the amount of abduction movements performed in the hip joint. In this context, the question arises whether the results of individual tests are convergent. The aim of the study is to evaluate the relationship between strength of the hip abductor muscle measured by dynamometer, the single-leg-squat and the number of repetitions of the movements in time. Methods: A group of 35 students (20 women and 15 men) between 20 and 24 years old participated in the study. Each student was subjected to three tests assessing the condition of the hip and associated abductor muscles. Those included: assessment of hip joint abduction muscle strength in a dynamometric study, assessment of the number of abdomen movements performed lying on the side and standing, during a 30-second interval, and the single-leg-squat test. Results: Based on the tests conducted, a significant relationship was observed between the muscle strength measurement results for the left and right side in the dynamometric study and the number of hip abduction repetitions in 30 seconds and the single-leg-squat test. Conclusions: The obtained results indicate a significant relationship between the results of all the tests. In practice, this means that the tests can be used interchangeably.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 125-131
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Handgrip explosive force is correlated with mobility in the elderly women
    Autorzy:
    Borges, L. S.
    Fernandes, M. H.
    Schettino, L.
    Coqueiro, R. S. da
    Pereira, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/306407.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    starzenie
    mobilność
    siła mięśni
    aging
    mobility
    maximum muscle strength
    Opis:
    The analysis of explosive force, through rate of force development (RFD) and contractile impulse (CI), from handgrip strength data seems to be useful and promising information to study the aging of musculoskeletal system and health status. We aimed to test the hypothesis that, in elderly women, the handgrip explosive force could be better associated to the functional mobility than maximum handgrip strength. Handgrip strength and the performance of Timed Up & Go Test (TUG) were measured from sixty-five community-dwelling healthy elderly women. The average slope of the moment–time curve (Δ moment/Δ time) over the time interval of 0–200 ms relative to the onset of contraction was calculated to provide the RFD and CI. The highest strength achieved during the isometric contraction was used as maximum handgrip strength. Pearson correlations were used to assess the strength of the relationship between the handgrip strength parameters (Maximum strength and explosive force from 0–200 ms) and TUG test performance from older women. The correlation analysis showed that the TUG test performance was inversely correlated to the handgrip strength parameters, with better relationship with explosive force parameters. The handgrip explosive force seems to be a promising predictor of functional mobility of elderly women, since it showed a better relationship with functional mobility than maximum handgrip strength.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 3; 145-149
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Muscle torque of healthy individuals and individuals with spastic hemiparesis after passive static streching
    Autorzy:
    Freitas, S. T. T.
    Abreu, E. M. C.
    Reis, M. C.
    Cunha, B. S.
    Prianti, T. S. M.
    Lima, F. P.
    Lima, M. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/306898.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mięśnie
    siła mięśni
    rozciąganie
    muscle hypertonia
    muscle strength
    passive stretching
    Opis:
    Spasticity is one of the main causes of contracture, muscle weakness and subsequent functional incapacity. The passive static stretching can be included as having the purpose of increasing musculoskeletal flexibility, however, it also can influence the muscle torque. The objective is to verify the immediate effect of passive static stretching in the muscle strength of healthy and those who present spastic hemiparesis. There were assessed 20 subjects, 10 spastic hemiparetic (EG) and 10 healthy individuals (CG), including both sexes, aged between 22 and 78 years. The torque of extensor muscles of the knee was analyzed using isokinetic dynamometer. Results have shown that EG has less muscle torque compared to CG ( p < 0.01). In addition, EG presented a decrease in significance of muscle torque after stretching ( p < 0.05), however, it has not shown significant alteration in muscle torque of CG after performing the program that was prescribed. Immediately after the passive stretch, a significant torque decrease can be seen in hypertonic muscle; it is believed that this reduction may be associated with the physiological overlap between actin and myosin filaments and so preventing the muscle to develop a maximum contraction.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 35-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyznaczanie sił mięśniowych podczas chodu dzieci zdrowych
    Estimation of muscle forces during gait of healthy children
    Autorzy:
    Głowacka, A.
    Świtoński, E.
    Michnik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99317.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    siła mięśni
    elektromiografia
    biomechanika chodu
    sEMG
    muscle forces
    electromyography
    gait biomechanics
    Źródło:
    Aktualne Problemy Biomechaniki; 2012, 6; 31-36
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of upper limb muscle strength in the early phase of brain stroke
    Autorzy:
    Starosta, M.
    Kostka, J.
    Redlicka, J.
    Miller, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306344.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siła mięśni
    kończyna górna
    udar
    dynamometr
    muscle strength
    upper limb
    stroke
    dynamometer
    Opis:
    Purpose: The aim of this study was to determine the muscles with the lowest strength in nonaffected (non-A) and affected upper limb (A), to assess differences between men and women and to correlate these values with age in patients after stroke. Methods: Sixty hospitalized in Neurorehabilitation Ward patients (40 male, 20 female), 1-2 weeks after stroke, were enrolled to the study. Their age ranged from 50 to 80 years with a mean (sd) of 65,5 (18,7) years. Muscle force values from upper limb muscles were measured using the MicroFet 2 hand-held dynamometer. The results are displayed in newtons [N], mean values of muscular force, effect sizes and confidence intervals displayed as Cohen’s d and 95% CI were determined. Moreover, we made the coefficients correlation for differences in muscular force versus the Rivermead Motor Assessment (RMA) arm section. Results: Strength of (A) upper limb in comparison to (non-A) was 39% weaker. The severely affected muscle groups were the shoulder flexion 41% (women) versus 46% (men); elbow flexion 39% (women) versus 31% (men); wrist extension 36% (women) versus 42% (men). No significant correlations were found between muscle strength results and RMA or age. Conclusions: Muscle force of (A) upper limb after stroke demonstrates 39% decrease. Men show more significant decrease than women (40% vs 35%). Functional assessment in RMA values show the better results in women (4,9 ± 4,1) than men (3,4 ± 3,2).
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 3; 85-91
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower extremity muscle strength, postural stability and functional movement screen in female basketball players after ACL reconstruction : Preliminary report
    Autorzy:
    Wrzesień, Zuzanna
    Truszczynska-Baszak, Aleksandra
    Rzepka, Remigiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/307162.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    koszykówka
    ACL
    siła mięśni
    basketball players
    ACL reconstruction
    functional stability
    muscle strength
    Opis:
    The anterior cruciate ligament (ACL) tear is a common injury in basketball. Its consequence is a long absence from training, resulting from surgical treatment and long physiotherapy. The aim of the study was to assess muscle strength, postural stability and functional movements in female basketball players, who returned to professional sport careers after anterior cruciate ligament reconstruction. Methods: The study population consisted of 10 female basketball players after surgical reconstruction of anterior cruciate ligament. The control group consisted of 10 players without ACL injury. We used the Biodex System 4 Pro dynamometer to assess the muscle strength of the knee. We used it to conduct the test of flexors and extensors of the knee in isokinetic conditions. We also used Keiser Power Squat A300 in the single leg squat to measure power and the Biodex Balance SD dynamographic platform to assess balance in single leg stance. Results: We found deficits in both movement patterns and in muscle strength in the study population, compared to control group. Conclusions: The basketball players after ACL reconstruction had significant differences between the operated and non-operated limb. The differences may predispose them towards repeated ACL injuries.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 2; 71-81
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations between somatic features, anteroposterior spinal curvatures and trunk muscle strength in schoolchildren
    Autorzy:
    Barczyk-Pawelec, K.
    Dziubek, W.
    Piechura, J. R.
    Rożek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/307173.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    krzywizna kręgosłupa
    fotogrametria
    postura
    siła mięśni
    spinal curvatures
    photogrammetry
    posture
    muscle strength
    Opis:
    Background: Evaluation of body posture and strength of spinal muscles in children during their progressive ontogenesis is significant for the evaluation of their physical health condition and physical fitness. It is also a reference point in a process of control and medical care. Purpose: The aim if this study was to evaluate correlation between the selected features of somatic body structure, shape of anteroposterior spinal curves and force-velocity (FV) parameters of trunk muscles in school children. Participants and methods: The sample involved 104 children aged 10–11 years, 60 females (10.74 ± 0.7) and 44 males (10.50 ± 0.9). Body posture was assessed using the Moiré photogrammetry while trunk muscles (flexors and extensors) strength was measured isokinetically. Results: The results of the research revealed the existence of many average and strong correlations observed between the analysed somatic characteristics and forcevelocity (FV) parameters of trunk muscles. Correlation between the volume of the spinal curvatures in the sagittal plane and forcevelocity parameters of trunk extensors and flexors were average or weak for both groups of children. Conclusion: Somatic features indicated stronger correlation with trunk muscles' strength than with the size of the anteroposterior spinal curves.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 1; 133-139
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Body balance a few years after total hip replacement
    Autorzy:
    Wareńczak, Agnieszka
    Lisiński, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/307510.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    staw biodrowy
    chód
    siła mięśni
    balance
    total hip replacement
    gait
    muscle strength
    Opis:
    These aim of the study was to conduct a long-term evaluation of whether total hip replacement permanently affects the dynamic body balance. Methods: Twenty-five patients after the unilateral total hip replacement (mean age: 69.9 ± 6.2) and 25 subjects without the total hip replacement (mean age: 68.4 ± 4.8) who matched the age and overall health participated in this study. The force platform and functional tests such as Timed Up and Go, 3m walk test, Functional Reach Test, 30s Chair Stand Test, Step Test and Berg Balance Scale were used to assess dynamic balance. The results obtained in individual trials were compared using the Student’s t-test for independent variables, the Welch test or the non-parametric Mann–Whitney U-test. Results: Subjects from the THR group exhibited significantly increased time and distance in the tests performed on the force platform, compared to the control group. We also observed worse balance and functional test scores in the THR group: Timed Up and Go test ( p < 0.001), 3 m walk test ( p < 0.001), Functional Reach Test ( p < 0.001), 30 s Chair Stand Test ( p = 0.001) and Step Test (operated leg: p < 0.001, non-operated leg: p < 0.001). The results obtained in the Berg Balance Scale tests were not significantly different between the groups ( p = 0.218). Conclusions: We observed significant differences in postural stability and dynamic balance between patients after THR and subjects in the same age without endoprosthesis. Our research shows that total hip replacement permanently impairs patients’ dynamic balance and their functionality in certain lower-extremity activities.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 1; 87-96
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Force analysis of shoulder joint muscles in the early phase of brain stroke
    Autorzy:
    Starosta, M.
    Kostka, J.
    Miller, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306827.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siła mięśni
    staw ramienny
    udar
    dynamometr
    muscle force
    upper limb
    shoulder joint
    stroke
    dynamometer
    Opis:
    Upper limb impairment in the early phase of brain stroke is one of the key problems in rehabilitation. An estimation of muscle force can be a helpful factor for functional improvement after a stroke. The primary goals of this study were to determine the muscles with the lowest force in the affected (A) and non-affected (non-A) upper limb. Moreover, the differences between men and women were compared and these values were correlated with age. Methods: One hundred (n = 35 female, n = 65 male) post-stroke patients met the inclusion criteria. The mean age of the study participants was 66.1 years. Muscle force for external and internal rotators of shoulder was measured with handheld dynamometer. Moreover, the correlation coefficients for differences in muscular force with the patient’s age were estimated. Results: Our study reports that the force of the (A) side in relation to the (non-A) was by 37% weaker. We observed about a 40% decrease in the force of the shoulder’s external rotation (female – 42%; male – 41%) and shoulder’s flexion (by 38% – female; 40% – male). Significant correlations between the muscle force and the age of post-stroke patients were also found. It was concluded that about 4 weeks after the first stroke in the patient’s life, the external rotators are the most affected group of shoulder muscles. Conclusions: Neither sex nor the side of the ischemic brain injury influence the muscle force, whereas age determines both muscle force and muscle force deficits. Older post-stroke patients demonstrate fewer deficits in muscle strength than younger ones.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 3; 107-113
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isometric Pull and Push Strengths of Paraplegics in the Workspace: 1. Strength Measurement Profiles
    Autorzy:
    Das, B.
    Black, N. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/90074.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    isometric strength
    measurement
    pull and push strengths
    workspace
    reach envelopes
    paraplegics
    pomiary
    ciągnięcie
    pchanie
    siła mięśni
    praca mięśni
    Opis:
    The isometric strength profiles of male and female paraplegics were determined for pull and push strengths in the normal, maximum, and extreme working reach envelopes. A computerized isometric strength measurement system was designed and constructed for the purpose. The strongest pull location was at extreme reach vertically above the shoulder and the strength values for males and females were 473 and 318 newtons (N), respectively. The strongest push location was at maximum reach, at vertical ($) angle of 45° and at horizontal (6) angle of 45° for males and at 0° for women and the strength values were 235 and 172 N, respectively. The nature of the strength profiles was found to be similar for both the sexes. The pull and push strengths of the female were 77 and 68% that of the male, respectively.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 47-65
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilometric indicators as an element of verifying rehabilitation of patients before and after reconstruction of anterior cruciate ligament
    Autorzy:
    Ogrodzka-Ciechanowicz, K.
    Czechowska, D.
    Chwała, W.
    Ślusarski, J.
    Gądek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/306953.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ACL
    kontrola postawy ciała
    siła mięśni
    rehabilitacja
    body posture control
    stabilometric indicators
    muscle strength
    rehabilitation
    Opis:
    The aim of the study was to evaluate effectiveness of rehabilitation in patients before and after rACL, based on stabilographic indicators. Methods: The research group was comprised of 31 men aged 20–57 with anterior cruciate ligament injury, qualified for reconstruction surgery. A measurement of static stabilometric indicators and muscle strength was taken twice for each patient – before surgery and after 6 months. To assess stabilographic indicators the stabilographic platform was used and to asses muscle strength a dynamometer was used. In order to assess knee function the Lysholm scale and VAS scale were used. Results: The rehabilitation programme improved static stability of the knee in the frontal plane, which is manifested by a significant shortening of the SPML path length. Rehabilitation proceedings should focus on improving static stability of the knee joint in the sagittal plane, because the results obtained indicate only a slight shortening of the SPAP length. The results of the Lysholm and VAS scales point to a positive influence of the applied rehabilitation. Conclusion: Inclusion into rehabilitation diagnostic tools to assess stabilometric indicators enables for effective verification of rehabilitation proceedings focused on restoring body posture control before and after the rACL.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 101-107
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isometric Pull and Push Strengths of Paraplegics in the Workspace: 2. Statistical Analysis of Spatial Factors
    Autorzy:
    Das, B.
    Black, N. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/89871.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    isometric strength
    pull and push strengths
    workspace reach levels
    horizontal and vertical angles
    paraplegics
    analiza statystyczna
    siła mięśni
    praca mięśni
    Opis:
    The effect of reach levels, horizontal angles, and vertical angles on isometric pull and push strengths of male and female was determined. Highly significant increases in men’s push strength were found between extreme to maximum reaches, and from extreme to normal reaches. However, for women’s push strength, a significant increase was found only between extreme to maximum reach. Significant or highly significant increases were found in men’s and women’s pull strength between the horizontal angle (0) sagittal through the active shoulder (90°) and other angles (0, 45, and 135°). However, for men’s push strength, highly significant increases were found between the horizontal angle 45° from the frontal plane, and other angles. For women’s push strength, significant or highly significant increases were found between the horizontal angles 0° and angles of 90 and 135°. For men’s and women’s pull strength, significant or highly significant increases were found between the vertical angle (), 90°, and other angles (-20, 0, and 45°). Similar increases were found for women’s push strength between the 45° angle and other angles. In the design of a workstation for paraplegics that requires pull and push forces, consideration must be given to the spatial factors.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 1; 67-80
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do different muscle strength levels affect stability during unplanned gait termination?
    Autorzy:
    Cen, Xuanzhen
    Jiang, Xinyan
    Gu, Yaodong
    Powiązania:
    https://bibliotekanauki.pl/articles/306615.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    siła mięśni
    chód
    ciśnienie podeszwowe
    równowaga
    muscle power
    muscle strength
    gait stop
    plantar pressure
    foot balance
    Opis:
    Unplanned gait termination (UGT) widely occurs in various sports and daily life as a kind of stress response to unexpected stimulus. However, the body stability may be greatly affected when the body completely stops. The purpose of this study was to examine the association between muscle strength levels and body stability during UGT through comparing the plantar pressure. Methods: Twenty healthy participants (10 male and 10 female) with different lower limbs muscle strength and power were asked to perform planned gait termination (PGT) and unplanned gait termination (UGT) on an 8-m walkway. Related plantar pressure data including maximum pressure, maximum force, contact area and center of pressure were recorded with Footscan pressure platform. Results: Two types of gait termination have significant differences in the plantar pressure distribution. Maximum pressure and maximum force in the lateral metatarsal increased significantly during UGT, compared to PGT. At the same time, data from the current study suggested that there might be a correlation between the muscle strength levels of individual and the stability during the gait termination, especially between the muscle power and UGT, which means that the more excellent muscle power an individual has, the more stable the body is when UGT is performed. Conclusions: The findings suggest that different muscle strength levels could affect stability during unplanned gait termination.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2019, 21, 4; 27-35
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of the mechanomyographic signal of three different muscles and at different levels of isometric contractions
    Autorzy:
    Jotta, B.
    Garcia, M. A. C.
    Pino, A. V.
    Souza, M. N. de
    Powiązania:
    https://bibliotekanauki.pl/articles/306272.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mechanomiografia
    sygnał MMG
    mięśnie
    siła mięśni
    mechanomyography
    MMG signal
    muscle twitch
    muscle activation pattern
    muscle force
    Opis:
    Purpose: Lateral (X) and longitudinal (Y) mechanical oscillations of muscle fibers that take place during muscular contraction seem to contain information additionally to the myoelectric activity, which can contribute to the interpretation of some muscle gradation force mechanisms. However, no previous study was found that had investigated the relationship between the muscle force and features associated to the mechanomyographic (MMG) signal obtained by means of a biaxial accelerometer in three different muscles. Therefore, the aim of this study was to evaluate the relationship between the force output at different load levels (20% to 100%) of the maximum voluntary isometric contraction (%MVIC) and the two signals supplied by a biaxial accelerometer and, in addition, the so-called resultant (R) acceleration signal derived from the two signals mentioned previously. Twenty seven male volunteers participated in this study. Methods: The force output related to the right biceps brachii, soleus and gastrocnemius medialis muscles was studied by means of linear regression models fit to log-transformed of the root mean square (RMS) values of the MMG signals in X, Y, and R axes versus each %MVIC. The phase angle of R acceleration (PhaseR) and anthropometric data were also considered. Results: The angular coefficient a and the antilog of y-intercept b from the log-transformed of MMG data values versus force output were able to distinguish partially motor unit strategies during isometric contractions in the three muscles studied. Conclusion: The findings suggest that biaxial accelerometer seems to be an interesting approach in the assessment of muscle contraction properties.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 73-84
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trening sportowy a dysproporcje funkcjonalnemięśni zginaczy i prostowników kolana
    Sport training versus function disproportion of knee flexion and extension
    Autorzy:
    Cieszczyk, P.
    Buryta, R.
    Kolbowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/789877.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    sport
    trening
    aktywnosc fizyczna
    uklad kostno-miesniowy
    staw kolanowy
    zginacze stawu kolanowego
    sila miesni
    testy izokinetyczne
    Źródło:
    Zeszyty Naukowe. Prace Instytutu Kultury Fizycznej. Uniwersytet Szczeciński; 2006, 23(444)
    1640-6818
    Pojawia się w:
    Zeszyty Naukowe. Prace Instytutu Kultury Fizycznej. Uniwersytet Szczeciński
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical characteristics of the jump down of healthy subjects and patients with knee injuries
    Autorzy:
    Mielińska, A.
    Czamara, A.
    Szuba, Ł.
    Będziński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/307066.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mięśnie
    siła mięśni
    aktywność mięśni
    prędkość
    biomechanika
    vertical ground reaction forces
    muscle power
    muscle activity
    velocity
    acceleration
    mass centre reposition
    Opis:
    Purpose: The aim of this study is to investigate the drop jump performance of male patients who underwent ACLR and a control group using combined data acquisition system. Methods: A total of 28 male subjects aged 20 to 26 were studied: 22 did not show and were not diagnosed with any knee joint dysfunction (the control group) and six men who underwent ACLR of the left limb (group of patients). The control group was age, height and body mass matched. A data acquisition setup consisting of three independent modules including force platforms, position analysis system and electromyography was used. Subjects were jumping down from 0.1, 0.2, and 0.3 m step heights. The acquired signals were used to determine the ground reaction force, muscular activity, mass centre position, velocity and acceleration. Results: Statistically significant differences were found between the groups (t-test, p < 0.05) in the maximum vertical ground reaction force in the left limb for 0.2 and 0.3 m step heights. Differences in the muscle activity between the groups were found to be statistically significant (t-test, p < 0.05) before the jump, during the landing phase, and after the jump for selected muscle groups and step heights. Conclusion: Combing the three independent measurement systems provided new information on drop jump biomechanics. The distribution of loads in different muscles was not uniform across the groups. Patients allocated more energy to control their motion and seemed to protect their operated limb by shifting the bodyweight to the healthy limb.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 2; 111-120
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is there any relationship between decrease in bone mineral density in women, and deterioration in quality of life?
    Czy istnieje związek pomiędzy zmniejszeniem gęstości masy kostnej u kobiet a pogorszeniem jakości życia?
    Autorzy:
    Mika, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1934241.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    Osteoporosis
    Physical activity
    muscle strength
    Spine
    range of motion
    osteoporoza
    aktywność fizyczna
    siła mięśni
    kręgosłup
    zakres ruchomości
    Opis:
    Background: Osteoporosis is a chronic metabolic bone disease leading to progressive destruction of bone microarchitecture and loss of function. Osteoporosis as a chronic disease can contribute to psychosocial disorders like changes in quality of life. The aim of our study was to assess if quality of life, especially such factors like pain, emotional status, physical fitness, are related to functional state of the spine of evaluated patients?Methods:189 female subjects aged 50 to 80 years were evaluated in this study. All were evaluated for: bone mineral density (BMD), the thoracic kyphosis, range of spinal thoracic motion in sagittal plane, strength of the back extensors and the physical activity level. Quality of life was assessed by SF–36 questionnaire.Results: Physically active subjects assessed their quality of life significantly better in all evaluated categories than sedentary subjects (p<0.01). When the cohort was divided according to their back extensor strength value there were significant differences in 5 from among 8 categories of quality of life (p<0.001), where stronger subjects assessed their quality of life better than sedentary. Subjects with a greater range of sagittal spinal motion assessed better their quality of life in 2 categories (p<0.001). There were no significant differences in quality of life both when the cohort were divided according to their BMD (p>0.05) and to thoracic kyphosis (p>0.05).Conclusion: The decrease in quality of life is influenced by pain, restriction in spinal range of motion, and decrease in back muscle strength. It was also observed that sedentary subjects assessed their quality of life worse in comparison to people who were physically active.
    Cel: Osteoporoza jako uogólniona choroba szkieletu skutkuje wystąpieniem złamań, którym często towarzyszy ból i utrata sprawności. Efektem tych często przewlekłych dolegliwości są zaburzenia natury psycho-społecznej wpływające na jakość życia. Celem pracy jest stwierdzenie czy samoocena jakości życia, czyli czynniki takie jak ból, stan emocjonalny, sprawność fizyczna wykazują związek ze stwierdzonym u pacjentów stanem funkcjonalnym kręgosłupa oraz gęstością mineralną kości? Materiał i Metoda: Badaniami objęto 189 kobiet w wieku 50–80 lat. U każdego pacjenta wykonano następujące pomiary, na podstawie których podzielono badaną populację na podgrupy: pomiar gęstości tkanki kostnej (BMD), pomiar kąta kifozy piersiowej, pomiar zakresu ruchomości w płaszczyźnie strzałkowej odcinka piersiowego kręgosłupa, pomiar siły mięśni prostowników kręgosłupa oraz ocena poziomu aktywności fizycznej. Do oceny jakości życia pacjentów zastosowano kwestionariusz samooceny SF–36. Wyniki: Osoby aktywne fizycznie wykazywały statystycznie istotnie lepszą samoocenę jakości życia w zakresie wszystkich analizowanych kategorii w porównaniu z pacjentami prowadzącymi siedzący tryb życia (p<0,01). W przypadku, gdy siła mięśni stanowiła kryterium grupujące stwierdzono statystycznie istotne różnice w 5 z 8 analizowanych kategorii samooceny jakości życia (p<0,001) – osoby silniejsze oceniały jakość swojego życia lepiej niż słabsze. Osoby, u których zakres ruchomości kręgosłupa w płaszczyźnie strzałkowej był większy wykazywały lepszą samoocenę w 2 kategoriach (p<0,001). Nie stwierdzono statystycznie istotnych różnic zarówno, gdy analizowano zmienność w samoocenie jakości życia w zależności od stwierdzonej u pacjentów gęstości masy kostnej (p>0,05), jak i w zależności od wielkości kąta kifozy piersiowej (p>0,05). Wnioski: Na pogorszenie jakości życia wpływa ograniczenie ruchomości kręgosłupa i spadek siły mięśniowej. Zaobserwowano też gorszą samoocenę u osób prowadzących siedzący tryb życia w porównaniu z osobami aktywnymi fizycznie.
    Źródło:
    Medical Rehabilitation; 2005, 9(2); 15-19
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    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:
    Electromyographic Analysis of a Repetitive Hand Gripping Task
    Autorzy:
    Cook, T.
    Rosecrance, J.
    Zimmermann, C.
    Gerleman, D.
    Ludewig, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/91061.pdf
    Data publikacji:
    1998
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    electromyography
    cumulative trauma disorders
    work-rest cycle
    muscle force
    hand gripping
    elektromiografia
    siła mięśni
    cykl pracy
    kończyna górna
    Opis:
    Electromyography (EMG) has been proposed as a method for determining muscle effort in repetitive upper limb tasks, which are often related to cumulative trauma disorders. EMG activity of the finger flexor musculature was investigated during a repetitive hand gripping task having 5 different cycle durations (2 to 6 s), various percentage of work time (and rest) within the work cycle (20% to 80%), and 3 different grip force levels. Thirty healthy adult participants each performed 27 randomly ordered 30-s repetitive hand gripping trials as well as 3 isometric contractions, which were used to normalize data from the hand gripping trials. There was a significant decrease in mean EMG as the duration of the work-rest cycle time increased. At each force level, EMG increased as the percentage of work time within the work-rest cycle increased, but to a greater extent at the highest force level. The results of this study suggest that overall muscle effort, and perhaps muscle fatigue, can be reduced most effectively by modifying the force requirements of the repetitive task. Other variables, such as the percentage of work time within a cycle and overall work cycle time have less effect on the EMG activity level. The results of this study have implications for developing strategies to reduce muscle fatigue during repetitive hand gripping tasks in an effort to reduce the effects of cumulative trauma disorders.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 185-198
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal for an Indexical Method of Evaluating Risk of Hand Tool Operators’ Exposure to Mechanical Vibrations
    Autorzy:
    Engel, Z.
    Kowalski, P.
    Zawieska, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/90780.pdf
    Data publikacji:
    2002
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    hand-arm vibration
    tool
    feed force
    griping force
    drgania
    narzędzia ręczne
    zagrożenia zdrowia
    operator maszyn i urządzeń
    siła mięśni
    siła chwytania
    ręka
    Opis:
    The article presents proposals for an indexical evaluation of exposure of hand tool operators to vibrations. The presented indices have been developed on the basis of the results of laboratory tests. The examinations studied the effect of pressure force and grip force exerted by an operator on a hand tool as well as the amplitudes and frequencies of an exciting signal on vibrations transmitted in the hand-tool handle system.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2002, 8, 2; 183-194
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie koncepcyjne środków transportu na rzecz rekultywacji terenów górniczych
    Conceptual design of transportation facility for the mining land reclamation
    Autorzy:
    Derlukiewicz, D.
    Lewandowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/170288.pdf
    Data publikacji:
    2014
    Wydawca:
    Poltegor-Instytut Instytut Górnictwa Odkrywkowego
    Tematy:
    rekultywacja terenów górniczych
    środki transportu
    Creative Design
    siła mięśni
    reclamation of mining areas
    transport means
    creative design
    muscle forces
    Opis:
    W artykule zaprezentowano proces projektowania koncepcyjnego na przykładzie projektu środka transportu wykorzystującego siłę mięśni ludzkich. Celem projektu było również zagospodarowanie terenów górniczych. W artykule pokazano źródła inspiracji projektantów oraz wyniki procesu projektowego na przykładzie interdyscyplinarnego projektu „Creative Design”.
    The article presents the conceptual design process on the example of the means of transport that use human muscle power. The aim of the project was also to develop the mining areas. The article shows the sources of inspiration for designers and the results of the design process on the example of an interdisciplinary project “Creative Design”.
    Źródło:
    Górnictwo Odkrywkowe; 2014, 55, 4-5; 260-264
    0043-2075
    Pojawia się w:
    Górnictwo Odkrywkowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany mocy i skoczności u siatkarek w okresie przygotowawczym
    Changes of power and jumping skill in female volleyball players during preparatory period
    Autorzy:
    Lipińska, M.
    Michalski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99226.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    kończyny dolne
    siła mięśni
    wyskok CMJ
    wyskok BCMJ
    siatkówka kobiet
    lower limbs
    muscle force
    CMJ jump
    BCMJ jump
    women's volleyball
    Opis:
    Celem pracy było określenie zmian mocy kończyn dolnych i wysokości uniesienia środka masy ciała mierzonych w wyskokach CMJ i BCMJ na platformie dynamometrycznej u siatkarek w okresie przygotowawczym. W badaniach uczestniczyło 14 siatkarek. Pomiar mocy kończyn dolnych i wysokości uniesienia środka masy ciała przeprowadzono na platformie dynamometrycznej. Moc maksymalna uległa nieistotnemu zwiększeniu o 6,3% w CMJ i zmniejszeniu o 4,1% w BCMJ podczas gdy wysokość uniesienia środka masy ciała nie uległa zmianie w CMJ i zwiększyła się istotnie o 4,7% w BCMJ.
    The aim of this study was to determine the changes of power of lower limbs and height of rise of the body mass center at CMJ and BCMJ jumps on the dynamometric platform of female volleyball players during preparatory period. Fourteen female volleyball players took part in this study. The measurement of lower limb power and height of rise of the body mass center was carried out on a dynamometric platform. Maximal power has nonsignificantly increased by 6.3% in CMJ, and decreased by 4.1% in BCMJ while height of rise of the body mass centre did not change in the CMJ and increased significantly by 4.7% in BCMJ.
    Źródło:
    Aktualne Problemy Biomechaniki; 2011, 5; 75-80
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ kriostymulacji i kinezyterapii na sprawność stawów kolanowych u chorych na reumatoidalne zapalenie stawów
    The influence of cryostimulation and kinesitherapy on knee joints of patients suffering from rheumatoid arthritis
    Autorzy:
    Jezierski, Cz.
    Powiązania:
    https://bibliotekanauki.pl/articles/261421.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
    Tematy:
    kriostymulacja
    reumatoidalne zapalenie stawów
    siła mięśni
    zakres ruchu
    prędkość kątowa stawu
    cryostimulation
    rheumatoid arthritis
    range of motion
    angular velocity of joints
    Opis:
    W artykule przedstawione są wyniki pomiarów siły mięśni uda, zakresu ruchu i prędkości kątowej stawu kolanowego 412 pacjentów z reumatoidalnym zapaleniem stawów (RZS), u których zastosowano w leczeniu kriostymulację i kinezyterapię. W wyniku przeprowadzonych badań i ich analizy stwierdzono, że zastosowanie kriostymulacji i skojarzonej z nią kinezyterapii poprawia znacznie siłę mięśni, jak też ruchomość i prędkość kątową stawu kolanowego. Zastosowanie tylko jednego z dwóch omawianych zabiegów przywraca częściowo silę mięśni, nie mając jednak większego wpływu na zakres ruchu i prędkość kątową.
    Results of measurements of the thigh muscle strength, as well as a range of motion and angular velocity of knee joints in 412 patients suffering from rheumatoid arthritis, treated with cryostimulation and kinesitherapy, are presented. After the study and analysis it was stated that application of cryostimulation and associated kinesitherapy significantly improves muscle strength, as well as range of motion and angular velocity of a knee joint. Administration of the one of described treatments, restores only muscle strength partially, while having no significant impact on range of motion or angular velocity.
    Źródło:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2008, 14, 3; 206-208
    1234-5563
    Pojawia się w:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Isometric Pull-Push Strengths in Workspace. 1, Strength Profiles
    Autorzy:
    Das, B.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/90551.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    isometric strength
    push and pull strengths
    workspace reach levels
    vertical and horizontal angles
    workstation design
    pchanie
    siła mięśni
    praca mięśni
    pozycja przy pracy
    pozycja siedząca
    pozycja stojąca
    Opis:
    The isometric pull and push strength profiles of males and females were determined in seated and standing positions in the workspace. The strongest pull strength location was at extreme reach vertically above the shoulder for both males and females. The greatest pull strength of 400 Newtons (N) for males was recorded in the seated and standing positions. Females. pull strengths in the seated and standing positions were 222 and 244 N, respectively. The strongest push strength was always at the maximum reach at the overhead location. Males. maximum push strength was 227 N in the seated position and 251 N in the standing position. Females’ maximum push strength was 96 N in the seated position and 140 N in the standing position. On the average the strength in the standing position was 79% of the seated position. The push strength was 71% of the pull strength and females were 56% as strong as males.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 43-58
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Job Level Risk Assessment Using Task Level Strain Index Scores: A Pilot Study
    Autorzy:
    Drinkaus, P.
    Bloswick, D. S.
    Sesek, R.
    Mann, C.
    Bernard, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90342.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    Strain Index
    Distal Upper Extremity (DUE)
    multi-task risk assessment
    ocena ryzyka zawodowego
    choroby narządów ruchu
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    Opis:
    This paper explores 2 methods of modifying the Strain Index (SI) to assess the ergonomic risk of multi-task jobs. Twenty-eight automotive jobs (15 cases and 13 controls) were studied. The first method is based on the maximum task SI score, and the second method is modeled on the NIOSH Composite Lifting Index (CLI) algorithm, named cumulative assessment of risk to the distal upper extremity (CARD). Significant odds ratios of 11 (CI 1.7–69) and 24 (CI 2.4–240) were obtained using the modified maximum task and CARD, respectively. This indicates that modification of the SI may be useful in determining the risk of distal upper extremity injury associated with a multi-task job.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 141-152
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isometric Pull-Push Strengths in Workspace. 2, Analysis of Spatial Factors
    Autorzy:
    Das, B.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/90758.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    isometric strength
    push and pull strengths
    workspace reach levels
    vertical and horizontal angles
    workstation design
    pchanie
    siła mięśni
    praca mięśni
    pozycja przy pracy
    pozycja siedząca
    pozycja stojąca
    projektowanie miejsc pracy
    Opis:
    The effect of reach levels, horizontal angles and vertical angles on isometric pull and push strengths of males and females in standing and seated positions was determined. The effect of reach levels on strength varied as a consequence of force direction, working position and gender. Reach level has a significant effect on women's pull strength in the seated position and on push strength in the standing position. The strength value was significantly greater in the extreme reach than in maximum or normal reach. Vertical angle ö had a significant effect on strength consistently in all cases. Strength values increased significantly with the increase of ö angles from 0º to 45º to 90º. The horizontal angle è had a significant influence only on the pull strength of standing and seated men and standing women (not seated woman). The maximum strength was significantly greater at è = 90º.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 59-64
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Job Level Risk Assessment Using Task Level ACGIH Hand Activity Level TLV Scores: A Pilot Study
    Autorzy:
    Drinkaus, P.
    Sesek, R.
    Bloswick, D. S.
    Mann, C.
    Bernard, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/90591.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    HAL
    TLV
    hand activity level
    multitask
    work-related risk assessment
    ocena ryzyka zawodowego
    choroby narządów ruchu
    obciążenie fizyczne
    kończyna górna
    siła mięśni
    ocena sprawności fizycznej
    Opis:
    Existing upper extremity musculoskeletal disorder analytical tools are primarily intended for single or monotask jobs. However, many jobs contain more than 1 task and some include job rotation. This case/control study investigates methods of modifying an existing tool, the American Conference of Governmental Industrial Hygienists (ACGIH) Hand Activity Level (HAL) Threshold Limit Value (TLV), to assess the upper extremity risk of multi-task jobs. Various methods of combining the task differences and ratios into a job level assessment were explored. Two methods returned significant odds ratios, (p < .05) of 18.0 (95% CI 1.8–172) and 12.0 (95% CI 1.2–120). These results indicate that a modified ACGIH HAL TLV may provide insight into the workrelated risk of multi-task jobs. Further research is needed to optimize this process.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 3; 263-281
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the strength and endurance of the trunk muscle in patients with low back pain
    Ocena siły i wytrzymałości mięśni tułowia pacjentów z zespołem dolnego odcinka kręgosłupa
    Autorzy:
    Głodzik, Jacek
    Chwała, Wiesław
    Marchewka, Anna
    Ruchlewicz, Tadeusz
    Skura, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1939058.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
    Tematy:
    Low Back Pain
    muscle strength
    muscle endurance
    zespół bólowy dolnego odcinka kregosłupa
    siła i wytrzymałosc miesni
    Opis:
    Introduction: In this study, strength and endurance of the trunk muscles were assessed in patients with spondyloarthrosis of the lower spine. Material and methods: 52 women and 49 men with low back pain syndrome (LBPS) were enrolled into the study. The muscle strength of the flexors and extensors of the trunk was determined by calculation of the maximum (MT) and relative torque (RT) during an isometric contraction. Evaluation of endurance of the extensors used calculation of the regression coefficient of the strength reduction during the testing of maximum strength capability. The obtained results were compared to results obtained in healthy persons. Moreover, the relation of those parameters to age, body-mass index – BMI (describing somatic habitus) and the Oswestry Disability Index – ODI (describing pain intensity during activities of daily living) was assessed. Separate analyses were conducted for the groups of males and females.Results: Based on the conducted study and the performed analyses, it can be stated that in patients with chronic low back pain syndrome there is a marked reduction in trunk muscle strength as compared to healthy persons. For females, the reduction ranged from 45% (flexors) to 48% (extensors) for absolute maximum torque values, while for relative values (RT) – from 51% (flexors) to 56% (extensors). In men, the strength reduction of abdominal and back muscles was smaller and was approximately 40% (for MT and RT). Because of such differences in the strength of the back muscles and methodological reasons, endurance variables were not compared. Reduction in trunk muscle strength is primarily due to the pain syndrome and does not depend on patients’ age or habitus. Lower muscle strength can affect the intensity of spinal pain during every-day activities.Conclusions: Precise determination of strength and endurance of the trunk muscles and the appropriate selection of methods of their reinforcement should constitute one of the principal aims of rehabilitation treatment in patients with low back pain.
    Źródło:
    Medical Rehabilitation; 2008, 12(3); 15-23
    1427-9622
    1896-3250
    Pojawia się w:
    Medical Rehabilitation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective utilization of man shift through sustainable workload testing for underground mining machine operators. An ergonomic based man-machine interface approach
    Autorzy:
    Dey, Netai Chandra
    Dey, Shibaji
    Powiązania:
    https://bibliotekanauki.pl/articles/2064404.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    fatigue sustainability
    FS
    muscle force
    MF
    heart rate ratio
    HR ratio
    exposure time period
    ETP
    effective utilization of man shift
    EUMS
    workload simulation
    siła mięśni
    obciążenie pracą
    okres ekspozycji
    degradacja zmęczeniowa
    tętno
    środowiskowe warunki pracy
    Opis:
    Insight of man-machine interfaces during mining machine operations, better co-ordinance with human efficiencies and suitable workload selection in underground mining machine operation are the main viewpoints of the study. Total 12 side discharge loader (SDL) and load haul dumper (LHD) operators [N = 12] have been taken as participants of the study. The methodology is divided into two parts first part is devoted to measuring and analyzing workload response of machine operation with polar heart rate monitor. Machine operator’s heart rate ratio (HR ratio) for the whole shift is recorded and metabolic rate (MR) has been analyzed. Additionally, fatigue sustainability (FS) and degradation of muscle force (MF) are recorded for each work cycles up to exposure time period (ETP) of 360 minutes. In the second part of the methodology, based on the HR ratio recorded during the mining operation, a workload simulation study is undertaken on a treadmill at the surface following BRUCE protocol. At treadmill, based on HR ratio, workload achieved from mines along with three different workloads i.e. low, moderate and high has been tested. Differences in FS and degradation rate of MF after each workload experiment have been recorded. A result from the underground operational study shows that there is about 43.2% and 32.4% of decreasing MF for SDL and LHD operators after end of spells at mines. Additionally, a negative correlation (r = -0.99) is found between ETP and MF. The workload simulation study shows that there are significant differences between FS (p < 0.05) and MF (p < 0.05) data of mining and treadmill experiment with the same workload. In comparison to an underground operation, FS rate of low, moderate and high workload is recorded 60%, 35%, and 15% higher respectively than of mine workload. Higher FS rate may achieve due to availability of good environment. Among the tested workload only low kind of workload is found suitable for mining machinery job as degradation of MF is found significantly (p < 0.05) low and FS is found significantly (p < 0.01) high in this kind of workload. Therefore, it can be concluded that in mining machinery operation better to adopt low workload for effective utilization of man shift (EUMS) as it gives comparatively low MF degradation and better FS during continuous work.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 394--403
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości wykorzystania sygnału EMG do sterowania
    Application of EMG signal in control systems
    Autorzy:
    Nawrocka, A.
    Moszkowski, T.
    Szefer, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/99228.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    sygnał EMG
    siła mięśniowa
    aktywność elektryczna mięśni
    sterowanie
    EMG signal
    muscular force
    electromuscular activity
    control
    Opis:
    Celem przeprowadzonych badań było wykazanie użyteczności sygnału EMG (elektromiograficznego) w teorii sterowania. Przeprowadzono badanie stwierdzające powiązanie pomiędzy aktywnością elektryczną mięśni (biceps i triceps brachii) a siłą mięśniową w warunkach statycznych. Opracowano algorytm obróbki danych elektromiograficznych. Wykazano liniową zależność pomiędzy omawianymi wielkościami fizycznymi jednocześnie potwierdzając użyteczność sygnału EMG jako sygnału sterującego. Jednakże zaleca się poszerzenie przeprowadzonych badań o badania dynamiczne skurczu mięśnia.
    The aim of the study was to perform sEMG (surfacial electromyography) signal analysis focusing on its applicability for control purposes. Research that aimed at determining the relation between electromuscular activity and static muscular force was conducted. Algorithm for processing of the obtained data was prepared. Linear dependence of the aforementioned quantities was established, therefore the convenience of usage of sEMG as a control signal was confirmed. However, further research on the dynamics of muscular contraction is necessary.
    Źródło:
    Aktualne Problemy Biomechaniki; 2011, 5; 109-114
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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