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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of airplane passenger seat armrest height on human neck comfort when using a smartphone
    Autorzy:
    Tang, Xing
    Yu, Suihuai
    Chu, Jianjie
    Zhang, Luwei
    Fan, Hao
    Hu, Yukun
    Jiang, Gang
    Powiązania:
    https://bibliotekanauki.pl/articles/2084809.pdf
    Data publikacji:
    2022-04-11
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    smartphone
    airplane
    armrest height
    head posture
    neck comfort
    flexion angle
    Opis:
    ObjectivesThe objective of this study was to explore the relationship between seat armrest height and human neck comfort when using a smartphone while sitting on a passenger seat during the flight.Material and MethodsThe authors used a wireless angle-measuring instrument and subjective comfort scale to evaluate the changes of head flexion angle and neck comfort level of 24 young smartphone users in an aircraft simulated cabin.ResultsThe study results indicated that using a smartphone while sitting on a passenger seat during the flight would pose a larger discomfort to the neck, and the discomfort would be higher for gaming than reading tasks. Seat armrest height is related to the comfort level of the neck when using a smartphone, increasing the height of the armrest can effectively alleviate discomfort in this state.ConclusionsConsidering the prevalence of passengers using smartphones in aircraft, a seat armrest that can be properly adjusted in height, which can effectively reduce the risk of passenger head flexion angle and neck discomfort.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2022, 35, 2; 199-208
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of measurement position on brachial–ankle pulse wave velocity
    Autorzy:
    Shimawaki, S.
    Toda, M.
    Nakabayashi, M.
    Sakai, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/306488.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    postawa ciała
    prędkość
    sztywność
    staw kolanowy
    posture
    pulse wave velocity
    vascular stiffness
    knee flexion angle
    Opis:
    Arterial stiffness measurements are primarily used for the early detection of arteriosclerosis. Methods and devices that can easily measure arterial stiffness at home are in demand. We propose a simple method for measuring brachial–ankle pulse wave velocity (baPWV) at home using a reclining chair and investigate the effects of positioning on baPWV measurement. We measured baPWV in 50 healthy men (21–70 years) in seven different measurement positions, including the supine position, sitting, sitting with the knees flexed at 45°, sitting with the knees flexed at 0°, reclining at 37°, reclining at 50°, and standing. BaPWV was significantly lower in the supine position (P < 0.01) than in the other positions. It was significantly higher in the sitting position (P < 0.01) than in the reclining position (37°). No changes in baPWV were seen changing the knee flexion angle alone while sitting. Strong correlations were also observed between baPWV in the supine position and that in other positions. We showed that baPWV in the supine position can be calculated by making corrections to baPWV measured in the sitting position at a reclining angle. Utilizing this corrected value would allow easy measurement at home using a reclining chair.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 1; 111-116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the patellar button thickness on the knee flexion after total knee arthroplasty
    Autorzy:
    Rosso, I.
    Surface, C.
    Antonaci, P.
    Surface, F. M.
    Negretto, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/949740.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rzepka
    kąt zgięcia
    osteoartroza
    endoprotezoplastyka całkowita stawu kolanowego
    modelowanie
    osteoarthritis
    total knee arthroplasty
    patellar button
    flexion angle
    modeling
    Opis:
    One of the main problems of knee replacement is the limit of knee flexion. This study focuses on the knee implant and the patellar component currently in use in total knee arthroplasty, analyzing the influence of patellar thickness on the degree of knee flexion following surgery. Methods: A kinematics study was performed to evaluate whether an optimal patellar thickness can be identified, which enables the maximum flexion angle to be achieved. Using TC images, a healthy model was built. On this basis, a model of a knee joint which had undergone total knee arthroplasty using a Legion PS prosthesis was constructed. Initially, the standard thickness of patellar implant (9 mm) was used to build the model; then several different patellar implant thicknesses (in the range of 5–15 mm) were analyzed. Results: The results show a non-linear trend: a button thickness of less than 9 mm does not change the flexion angle, whereas a button thickness of over 9 mm results in a loss of flexion. The flexion loss is significant in the first two additions of thicknesses but negligible in the last ones. Conclusions: In the case studied, flexion reduction is not linearly proportional to the patellar thickness. The outcome of total knee arthroplasty is considered to be satisfactory with the standard patellar button. The results of this study could be used to compare the kinematics with other total prosthesis and patellar implants, and should enable the optimization of the patellar residue bone thickness to obtain deep flexion.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 121-134
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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